diff --git a/contrib/intarray/_int_selfuncs.c b/contrib/intarray/_int_selfuncs.c
index 9b4a22f..3d92025 100644
*** a/contrib/intarray/_int_selfuncs.c
--- b/contrib/intarray/_int_selfuncs.c
*************** _int_matchsel(PG_FUNCTION_ARGS)
*** 136,146 ****
  	int			nmcelems = 0;
  	float4		minfreq = 0.0;
  	float4		nullfrac = 0.0;
! 	Form_pg_statistic stats;
! 	Datum	   *values = NULL;
! 	int			nvalues = 0;
! 	float4	   *numbers = NULL;
! 	int			nnumbers = 0;
  
  	/*
  	 * If expression is not "variable @@ something" or "something @@ variable"
--- 136,142 ----
  	int			nmcelems = 0;
  	float4		minfreq = 0.0;
  	float4		nullfrac = 0.0;
! 	AttStatsSlot sslot;
  
  	/*
  	 * If expression is not "variable @@ something" or "something @@ variable"
*************** _int_matchsel(PG_FUNCTION_ARGS)
*** 193,198 ****
--- 189,196 ----
  	 */
  	if (HeapTupleIsValid(vardata.statsTuple))
  	{
+ 		Form_pg_statistic stats;
+ 
  		stats = (Form_pg_statistic) GETSTRUCT(vardata.statsTuple);
  		nullfrac = stats->stanullfrac;
  
*************** _int_matchsel(PG_FUNCTION_ARGS)
*** 200,228 ****
  		 * For an int4 array, the default array type analyze function will
  		 * collect a Most Common Elements list, which is an array of int4s.
  		 */
! 		if (get_attstatsslot(vardata.statsTuple,
! 							 INT4OID, -1,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 NULL,
! 							 &values, &nvalues,
! 							 &numbers, &nnumbers))
  		{
  			/*
  			 * There should be three more Numbers than Values, because the
  			 * last three (for intarray) cells are taken for minimal, maximal
  			 * and nulls frequency. Punt if not.
  			 */
! 			if (nnumbers == nvalues + 3)
  			{
  				/* Grab the lowest frequency. */
! 				minfreq = numbers[nnumbers - (nnumbers - nvalues)];
  
! 				mcelems = values;
! 				mcefreqs = numbers;
! 				nmcelems = nvalues;
  			}
  		}
  	}
  
  	/* Process the logical expression in the query, using the stats */
  	selec = int_query_opr_selec(GETQUERY(query) + query->size - 1,
--- 198,227 ----
  		 * For an int4 array, the default array type analyze function will
  		 * collect a Most Common Elements list, which is an array of int4s.
  		 */
! 		if (get_attstatsslot(&sslot, vardata.statsTuple,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS))
  		{
+ 			Assert(sslot.valuetype == INT4OID);
+ 
  			/*
  			 * There should be three more Numbers than Values, because the
  			 * last three (for intarray) cells are taken for minimal, maximal
  			 * and nulls frequency. Punt if not.
  			 */
! 			if (sslot.nnumbers == sslot.nvalues + 3)
  			{
  				/* Grab the lowest frequency. */
! 				minfreq = sslot.numbers[sslot.nnumbers - (sslot.nnumbers - sslot.nvalues)];
  
! 				mcelems = sslot.values;
! 				mcefreqs = sslot.numbers;
! 				nmcelems = sslot.nvalues;
  			}
  		}
  	}
+ 	else
+ 		memset(&sslot, 0, sizeof(sslot));
  
  	/* Process the logical expression in the query, using the stats */
  	selec = int_query_opr_selec(GETQUERY(query) + query->size - 1,
*************** _int_matchsel(PG_FUNCTION_ARGS)
*** 231,237 ****
  	/* MCE stats count only non-null rows, so adjust for null rows. */
  	selec *= (1.0 - nullfrac);
  
! 	free_attstatsslot(INT4OID, values, nvalues, numbers, nnumbers);
  	ReleaseVariableStats(vardata);
  
  	CLAMP_PROBABILITY(selec);
--- 230,236 ----
  	/* MCE stats count only non-null rows, so adjust for null rows. */
  	selec *= (1.0 - nullfrac);
  
! 	free_attstatsslot(&sslot);
  	ReleaseVariableStats(vardata);
  
  	CLAMP_PROBABILITY(selec);
diff --git a/src/backend/executor/nodeHash.c b/src/backend/executor/nodeHash.c
index cfc6b96..d9789d0 100644
*** a/src/backend/executor/nodeHash.c
--- b/src/backend/executor/nodeHash.c
*************** static void
*** 1283,1292 ****
  ExecHashBuildSkewHash(HashJoinTable hashtable, Hash *node, int mcvsToUse)
  {
  	HeapTupleData *statsTuple;
! 	Datum	   *values;
! 	int			nvalues;
! 	float4	   *numbers;
! 	int			nnumbers;
  
  	/* Do nothing if planner didn't identify the outer relation's join key */
  	if (!OidIsValid(node->skewTable))
--- 1283,1289 ----
  ExecHashBuildSkewHash(HashJoinTable hashtable, Hash *node, int mcvsToUse)
  {
  	HeapTupleData *statsTuple;
! 	AttStatsSlot sslot;
  
  	/* Do nothing if planner didn't identify the outer relation's join key */
  	if (!OidIsValid(node->skewTable))
*************** ExecHashBuildSkewHash(HashJoinTable hash
*** 1305,1323 ****
  	if (!HeapTupleIsValid(statsTuple))
  		return;
  
! 	if (get_attstatsslot(statsTuple, node->skewColType, node->skewColTypmod,
  						 STATISTIC_KIND_MCV, InvalidOid,
! 						 NULL,
! 						 &values, &nvalues,
! 						 &numbers, &nnumbers))
  	{
  		double		frac;
  		int			nbuckets;
  		FmgrInfo   *hashfunctions;
  		int			i;
  
! 		if (mcvsToUse > nvalues)
! 			mcvsToUse = nvalues;
  
  		/*
  		 * Calculate the expected fraction of outer relation that will
--- 1302,1318 ----
  	if (!HeapTupleIsValid(statsTuple))
  		return;
  
! 	if (get_attstatsslot(&sslot, statsTuple,
  						 STATISTIC_KIND_MCV, InvalidOid,
! 						 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS))
  	{
  		double		frac;
  		int			nbuckets;
  		FmgrInfo   *hashfunctions;
  		int			i;
  
! 		if (mcvsToUse > sslot.nvalues)
! 			mcvsToUse = sslot.nvalues;
  
  		/*
  		 * Calculate the expected fraction of outer relation that will
*************** ExecHashBuildSkewHash(HashJoinTable hash
*** 1326,1336 ****
  		 */
  		frac = 0;
  		for (i = 0; i < mcvsToUse; i++)
! 			frac += numbers[i];
  		if (frac < SKEW_MIN_OUTER_FRACTION)
  		{
! 			free_attstatsslot(node->skewColType,
! 							  values, nvalues, numbers, nnumbers);
  			ReleaseSysCache(statsTuple);
  			return;
  		}
--- 1321,1330 ----
  		 */
  		frac = 0;
  		for (i = 0; i < mcvsToUse; i++)
! 			frac += sslot.numbers[i];
  		if (frac < SKEW_MIN_OUTER_FRACTION)
  		{
! 			free_attstatsslot(&sslot);
  			ReleaseSysCache(statsTuple);
  			return;
  		}
*************** ExecHashBuildSkewHash(HashJoinTable hash
*** 1392,1398 ****
  			int			bucket;
  
  			hashvalue = DatumGetUInt32(FunctionCall1(&hashfunctions[0],
! 													 values[i]));
  
  			/*
  			 * While we have not hit a hole in the hashtable and have not hit
--- 1386,1392 ----
  			int			bucket;
  
  			hashvalue = DatumGetUInt32(FunctionCall1(&hashfunctions[0],
! 													 sslot.values[i]));
  
  			/*
  			 * While we have not hit a hole in the hashtable and have not hit
*************** ExecHashBuildSkewHash(HashJoinTable hash
*** 1426,1433 ****
  				hashtable->spacePeak = hashtable->spaceUsed;
  		}
  
! 		free_attstatsslot(node->skewColType,
! 						  values, nvalues, numbers, nnumbers);
  	}
  
  	ReleaseSysCache(statsTuple);
--- 1420,1426 ----
  				hashtable->spacePeak = hashtable->spaceUsed;
  		}
  
! 		free_attstatsslot(&sslot);
  	}
  
  	ReleaseSysCache(statsTuple);
diff --git a/src/backend/tsearch/ts_selfuncs.c b/src/backend/tsearch/ts_selfuncs.c
index 904d884..046f543 100644
*** a/src/backend/tsearch/ts_selfuncs.c
--- b/src/backend/tsearch/ts_selfuncs.c
*************** tsquerysel(VariableStatData *vardata, Da
*** 163,190 ****
  	if (HeapTupleIsValid(vardata->statsTuple))
  	{
  		Form_pg_statistic stats;
! 		Datum	   *values;
! 		int			nvalues;
! 		float4	   *numbers;
! 		int			nnumbers;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  
  		/* MCELEM will be an array of TEXT elements for a tsvector column */
! 		if (get_attstatsslot(vardata->statsTuple,
! 							 TEXTOID, -1,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 NULL,
! 							 &values, &nvalues,
! 							 &numbers, &nnumbers))
  		{
  			/*
  			 * There is a most-common-elements slot for the tsvector Var, so
  			 * use that.
  			 */
! 			selec = mcelem_tsquery_selec(query, values, nvalues,
! 										 numbers, nnumbers);
! 			free_attstatsslot(TEXTOID, values, nvalues, numbers, nnumbers);
  		}
  		else
  		{
--- 163,184 ----
  	if (HeapTupleIsValid(vardata->statsTuple))
  	{
  		Form_pg_statistic stats;
! 		AttStatsSlot sslot;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  
  		/* MCELEM will be an array of TEXT elements for a tsvector column */
! 		if (get_attstatsslot(&sslot, vardata->statsTuple,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS))
  		{
  			/*
  			 * There is a most-common-elements slot for the tsvector Var, so
  			 * use that.
  			 */
! 			selec = mcelem_tsquery_selec(query, sslot.values, sslot.nvalues,
! 										 sslot.numbers, sslot.nnumbers);
! 			free_attstatsslot(&sslot);
  		}
  		else
  		{
diff --git a/src/backend/utils/adt/array_selfuncs.c b/src/backend/utils/adt/array_selfuncs.c
index cfaf873..3ae6018 100644
*** a/src/backend/utils/adt/array_selfuncs.c
--- b/src/backend/utils/adt/array_selfuncs.c
*************** scalararraysel_containment(PlannerInfo *
*** 137,171 ****
  		statistic_proc_security_check(&vardata, cmpfunc->fn_oid))
  	{
  		Form_pg_statistic stats;
! 		Datum	   *values;
! 		int			nvalues;
! 		float4	   *numbers;
! 		int			nnumbers;
! 		float4	   *hist;
! 		int			nhist;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata.statsTuple);
  
  		/* MCELEM will be an array of same type as element */
! 		if (get_attstatsslot(vardata.statsTuple,
! 							 elemtype, vardata.atttypmod,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 NULL,
! 							 &values, &nvalues,
! 							 &numbers, &nnumbers))
  		{
  			/* For ALL case, also get histogram of distinct-element counts */
  			if (useOr ||
! 				!get_attstatsslot(vardata.statsTuple,
! 								  elemtype, vardata.atttypmod,
  								  STATISTIC_KIND_DECHIST, InvalidOid,
! 								  NULL,
! 								  NULL, NULL,
! 								  &hist, &nhist))
! 			{
! 				hist = NULL;
! 				nhist = 0;
! 			}
  
  			/*
  			 * For = ANY, estimate as var @> ARRAY[const].
--- 137,158 ----
  		statistic_proc_security_check(&vardata, cmpfunc->fn_oid))
  	{
  		Form_pg_statistic stats;
! 		AttStatsSlot sslot;
! 		AttStatsSlot hslot;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata.statsTuple);
  
  		/* MCELEM will be an array of same type as element */
! 		if (get_attstatsslot(&sslot, vardata.statsTuple,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS))
  		{
  			/* For ALL case, also get histogram of distinct-element counts */
  			if (useOr ||
! 				!get_attstatsslot(&hslot, vardata.statsTuple,
  								  STATISTIC_KIND_DECHIST, InvalidOid,
! 								  ATTSTATSSLOT_NUMBERS))
! 				memset(&hslot, 0, sizeof(hslot));
  
  			/*
  			 * For = ANY, estimate as var @> ARRAY[const].
*************** scalararraysel_containment(PlannerInfo *
*** 173,194 ****
  			 * For = ALL, estimate as var <@ ARRAY[const].
  			 */
  			if (useOr)
! 				selec = mcelem_array_contain_overlap_selec(values, nvalues,
! 														   numbers, nnumbers,
  														   &constval, 1,
  													   OID_ARRAY_CONTAINS_OP,
  														   cmpfunc);
  			else
! 				selec = mcelem_array_contained_selec(values, nvalues,
! 													 numbers, nnumbers,
  													 &constval, 1,
! 													 hist, nhist,
  													 OID_ARRAY_CONTAINED_OP,
  													 cmpfunc);
  
! 			if (hist)
! 				free_attstatsslot(elemtype, NULL, 0, hist, nhist);
! 			free_attstatsslot(elemtype, values, nvalues, numbers, nnumbers);
  		}
  		else
  		{
--- 160,185 ----
  			 * For = ALL, estimate as var <@ ARRAY[const].
  			 */
  			if (useOr)
! 				selec = mcelem_array_contain_overlap_selec(sslot.values,
! 														   sslot.nvalues,
! 														   sslot.numbers,
! 														   sslot.nnumbers,
  														   &constval, 1,
  													   OID_ARRAY_CONTAINS_OP,
  														   cmpfunc);
  			else
! 				selec = mcelem_array_contained_selec(sslot.values,
! 													 sslot.nvalues,
! 													 sslot.numbers,
! 													 sslot.nnumbers,
  													 &constval, 1,
! 													 hslot.numbers,
! 													 hslot.nnumbers,
  													 OID_ARRAY_CONTAINED_OP,
  													 cmpfunc);
  
! 			free_attstatsslot(&hslot);
! 			free_attstatsslot(&sslot);
  		}
  		else
  		{
*************** calc_arraycontsel(VariableStatData *vard
*** 369,417 ****
  		statistic_proc_security_check(vardata, cmpfunc->fn_oid))
  	{
  		Form_pg_statistic stats;
! 		Datum	   *values;
! 		int			nvalues;
! 		float4	   *numbers;
! 		int			nnumbers;
! 		float4	   *hist;
! 		int			nhist;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  
  		/* MCELEM will be an array of same type as column */
! 		if (get_attstatsslot(vardata->statsTuple,
! 							 elemtype, vardata->atttypmod,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 NULL,
! 							 &values, &nvalues,
! 							 &numbers, &nnumbers))
  		{
  			/*
  			 * For "array <@ const" case we also need histogram of distinct
  			 * element counts.
  			 */
  			if (operator != OID_ARRAY_CONTAINED_OP ||
! 				!get_attstatsslot(vardata->statsTuple,
! 								  elemtype, vardata->atttypmod,
  								  STATISTIC_KIND_DECHIST, InvalidOid,
! 								  NULL,
! 								  NULL, NULL,
! 								  &hist, &nhist))
! 			{
! 				hist = NULL;
! 				nhist = 0;
! 			}
  
  			/* Use the most-common-elements slot for the array Var. */
  			selec = mcelem_array_selec(array, typentry,
! 									   values, nvalues,
! 									   numbers, nnumbers,
! 									   hist, nhist,
  									   operator, cmpfunc);
  
! 			if (hist)
! 				free_attstatsslot(elemtype, NULL, 0, hist, nhist);
! 			free_attstatsslot(elemtype, values, nvalues, numbers, nnumbers);
  		}
  		else
  		{
--- 360,394 ----
  		statistic_proc_security_check(vardata, cmpfunc->fn_oid))
  	{
  		Form_pg_statistic stats;
! 		AttStatsSlot sslot;
! 		AttStatsSlot hslot;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  
  		/* MCELEM will be an array of same type as column */
! 		if (get_attstatsslot(&sslot, vardata->statsTuple,
  							 STATISTIC_KIND_MCELEM, InvalidOid,
! 							 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS))
  		{
  			/*
  			 * For "array <@ const" case we also need histogram of distinct
  			 * element counts.
  			 */
  			if (operator != OID_ARRAY_CONTAINED_OP ||
! 				!get_attstatsslot(&hslot, vardata->statsTuple,
  								  STATISTIC_KIND_DECHIST, InvalidOid,
! 								  ATTSTATSSLOT_NUMBERS))
! 				memset(&hslot, 0, sizeof(hslot));
  
  			/* Use the most-common-elements slot for the array Var. */
  			selec = mcelem_array_selec(array, typentry,
! 									   sslot.values, sslot.nvalues,
! 									   sslot.numbers, sslot.nnumbers,
! 									   hslot.numbers, hslot.nnumbers,
  									   operator, cmpfunc);
  
! 			free_attstatsslot(&hslot);
! 			free_attstatsslot(&sslot);
  		}
  		else
  		{
diff --git a/src/backend/utils/adt/network_selfuncs.c b/src/backend/utils/adt/network_selfuncs.c
index bcdd902..1d29ecd 100644
*** a/src/backend/utils/adt/network_selfuncs.c
--- b/src/backend/utils/adt/network_selfuncs.c
*************** networksel(PG_FUNCTION_ARGS)
*** 88,97 ****
  	Selectivity selec,
  				mcv_selec,
  				non_mcv_selec;
! 	Datum		constvalue,
! 			   *hist_values;
! 	int			hist_nvalues;
  	Form_pg_statistic stats;
  	double		sumcommon,
  				nullfrac;
  	FmgrInfo	proc;
--- 88,96 ----
  	Selectivity selec,
  				mcv_selec,
  				non_mcv_selec;
! 	Datum		constvalue;
  	Form_pg_statistic stats;
+ 	AttStatsSlot hslot;
  	double		sumcommon,
  				nullfrac;
  	FmgrInfo	proc;
*************** networksel(PG_FUNCTION_ARGS)
*** 146,167 ****
  	 * non-MCV population that satisfies the clause.  If we don't, apply the
  	 * default selectivity to that population.
  	 */
! 	if (get_attstatsslot(vardata.statsTuple,
! 						 vardata.atttype, vardata.atttypmod,
  						 STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 						 NULL,
! 						 &hist_values, &hist_nvalues,
! 						 NULL, NULL))
  	{
  		int			opr_codenum = inet_opr_codenum(operator);
  
  		/* Commute if needed, so we can consider histogram to be on the left */
  		if (!varonleft)
  			opr_codenum = -opr_codenum;
! 		non_mcv_selec = inet_hist_value_sel(hist_values, hist_nvalues,
  											constvalue, opr_codenum);
  
! 		free_attstatsslot(vardata.atttype, hist_values, hist_nvalues, NULL, 0);
  	}
  	else
  		non_mcv_selec = DEFAULT_SEL(operator);
--- 145,163 ----
  	 * non-MCV population that satisfies the clause.  If we don't, apply the
  	 * default selectivity to that population.
  	 */
! 	if (get_attstatsslot(&hslot, vardata.statsTuple,
  						 STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 						 ATTSTATSSLOT_VALUES))
  	{
  		int			opr_codenum = inet_opr_codenum(operator);
  
  		/* Commute if needed, so we can consider histogram to be on the left */
  		if (!varonleft)
  			opr_codenum = -opr_codenum;
! 		non_mcv_selec = inet_hist_value_sel(hslot.values, hslot.nvalues,
  											constvalue, opr_codenum);
  
! 		free_attstatsslot(&hslot);
  	}
  	else
  		non_mcv_selec = DEFAULT_SEL(operator);
*************** networkjoinsel_inner(Oid operator,
*** 277,318 ****
  				hist1_exists = false,
  				hist2_exists = false;
  	int			opr_codenum;
! 	int			mcv1_nvalues,
! 				mcv2_nvalues,
! 				mcv1_nnumbers,
! 				mcv2_nnumbers,
! 				hist1_nvalues,
! 				hist2_nvalues,
! 				mcv1_length = 0,
  				mcv2_length = 0;
! 	Datum	   *mcv1_values,
! 			   *mcv2_values,
! 			   *hist1_values,
! 			   *hist2_values;
! 	float4	   *mcv1_numbers,
! 			   *mcv2_numbers;
  
  	if (HeapTupleIsValid(vardata1->statsTuple))
  	{
  		stats = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		nullfrac1 = stats->stanullfrac;
  
! 		mcv1_exists = get_attstatsslot(vardata1->statsTuple,
! 									   vardata1->atttype, vardata1->atttypmod,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 									   NULL,
! 									   &mcv1_values, &mcv1_nvalues,
! 									   &mcv1_numbers, &mcv1_nnumbers);
! 		hist1_exists = get_attstatsslot(vardata1->statsTuple,
! 									  vardata1->atttype, vardata1->atttypmod,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										NULL,
! 										&hist1_values, &hist1_nvalues,
! 										NULL, NULL);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv1_length = Min(mcv1_nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv1_exists)
! 			sumcommon1 = mcv_population(mcv1_numbers, mcv1_length);
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple))
--- 273,305 ----
  				hist1_exists = false,
  				hist2_exists = false;
  	int			opr_codenum;
! 	int			mcv1_length = 0,
  				mcv2_length = 0;
! 	AttStatsSlot mcv1_slot;
! 	AttStatsSlot mcv2_slot;
! 	AttStatsSlot hist1_slot;
! 	AttStatsSlot hist2_slot;
  
  	if (HeapTupleIsValid(vardata1->statsTuple))
  	{
  		stats = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		nullfrac1 = stats->stanullfrac;
  
! 		mcv1_exists = get_attstatsslot(&mcv1_slot, vardata1->statsTuple,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 								 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS);
! 		hist1_exists = get_attstatsslot(&hist1_slot, vardata1->statsTuple,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										ATTSTATSSLOT_VALUES);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv1_length = Min(mcv1_slot.nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv1_exists)
! 			sumcommon1 = mcv_population(mcv1_slot.numbers, mcv1_length);
! 	}
! 	else
! 	{
! 		memset(&mcv1_slot, 0, sizeof(mcv1_slot));
! 		memset(&hist1_slot, 0, sizeof(hist1_slot));
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple))
*************** networkjoinsel_inner(Oid operator,
*** 320,341 ****
  		stats = (Form_pg_statistic) GETSTRUCT(vardata2->statsTuple);
  		nullfrac2 = stats->stanullfrac;
  
! 		mcv2_exists = get_attstatsslot(vardata2->statsTuple,
! 									   vardata2->atttype, vardata2->atttypmod,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 									   NULL,
! 									   &mcv2_values, &mcv2_nvalues,
! 									   &mcv2_numbers, &mcv2_nnumbers);
! 		hist2_exists = get_attstatsslot(vardata2->statsTuple,
! 									  vardata2->atttype, vardata2->atttypmod,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										NULL,
! 										&hist2_values, &hist2_nvalues,
! 										NULL, NULL);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv2_length = Min(mcv2_nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv2_exists)
! 			sumcommon2 = mcv_population(mcv2_numbers, mcv2_length);
  	}
  
  	opr_codenum = inet_opr_codenum(operator);
--- 307,327 ----
  		stats = (Form_pg_statistic) GETSTRUCT(vardata2->statsTuple);
  		nullfrac2 = stats->stanullfrac;
  
! 		mcv2_exists = get_attstatsslot(&mcv2_slot, vardata2->statsTuple,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 								 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS);
! 		hist2_exists = get_attstatsslot(&hist2_slot, vardata2->statsTuple,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										ATTSTATSSLOT_VALUES);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv2_length = Min(mcv2_slot.nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv2_exists)
! 			sumcommon2 = mcv_population(mcv2_slot.numbers, mcv2_length);
! 	}
! 	else
! 	{
! 		memset(&mcv2_slot, 0, sizeof(mcv2_slot));
! 		memset(&hist2_slot, 0, sizeof(hist2_slot));
  	}
  
  	opr_codenum = inet_opr_codenum(operator);
*************** networkjoinsel_inner(Oid operator,
*** 344,351 ****
  	 * Calculate selectivity for MCV vs MCV matches.
  	 */
  	if (mcv1_exists && mcv2_exists)
! 		selec += inet_mcv_join_sel(mcv1_values, mcv1_numbers, mcv1_length,
! 								   mcv2_values, mcv2_numbers, mcv2_length,
  								   operator);
  
  	/*
--- 330,339 ----
  	 * Calculate selectivity for MCV vs MCV matches.
  	 */
  	if (mcv1_exists && mcv2_exists)
! 		selec += inet_mcv_join_sel(mcv1_slot.values, mcv1_slot.numbers,
! 								   mcv1_length,
! 								   mcv2_slot.values, mcv2_slot.numbers,
! 								   mcv2_length,
  								   operator);
  
  	/*
*************** networkjoinsel_inner(Oid operator,
*** 355,367 ****
  	 */
  	if (mcv1_exists && hist2_exists)
  		selec += (1.0 - nullfrac2 - sumcommon2) *
! 			inet_mcv_hist_sel(mcv1_values, mcv1_numbers, mcv1_length,
! 							  hist2_values, hist2_nvalues,
  							  opr_codenum);
  	if (mcv2_exists && hist1_exists)
  		selec += (1.0 - nullfrac1 - sumcommon1) *
! 			inet_mcv_hist_sel(mcv2_values, mcv2_numbers, mcv2_length,
! 							  hist1_values, hist1_nvalues,
  							  -opr_codenum);
  
  	/*
--- 343,355 ----
  	 */
  	if (mcv1_exists && hist2_exists)
  		selec += (1.0 - nullfrac2 - sumcommon2) *
! 			inet_mcv_hist_sel(mcv1_slot.values, mcv1_slot.numbers, mcv1_length,
! 							  hist2_slot.values, hist2_slot.nvalues,
  							  opr_codenum);
  	if (mcv2_exists && hist1_exists)
  		selec += (1.0 - nullfrac1 - sumcommon1) *
! 			inet_mcv_hist_sel(mcv2_slot.values, mcv2_slot.numbers, mcv2_length,
! 							  hist1_slot.values, hist1_slot.nvalues,
  							  -opr_codenum);
  
  	/*
*************** networkjoinsel_inner(Oid operator,
*** 371,378 ****
  	if (hist1_exists && hist2_exists)
  		selec += (1.0 - nullfrac1 - sumcommon1) *
  			(1.0 - nullfrac2 - sumcommon2) *
! 			inet_hist_inclusion_join_sel(hist1_values, hist1_nvalues,
! 										 hist2_values, hist2_nvalues,
  										 opr_codenum);
  
  	/*
--- 359,366 ----
  	if (hist1_exists && hist2_exists)
  		selec += (1.0 - nullfrac1 - sumcommon1) *
  			(1.0 - nullfrac2 - sumcommon2) *
! 			inet_hist_inclusion_join_sel(hist1_slot.values, hist1_slot.nvalues,
! 									   hist2_slot.values, hist2_slot.nvalues,
  										 opr_codenum);
  
  	/*
*************** networkjoinsel_inner(Oid operator,
*** 383,400 ****
  		selec = (1.0 - nullfrac1) * (1.0 - nullfrac2) * DEFAULT_SEL(operator);
  
  	/* Release stats. */
! 	if (mcv1_exists)
! 		free_attstatsslot(vardata1->atttype, mcv1_values, mcv1_nvalues,
! 						  mcv1_numbers, mcv1_nnumbers);
! 	if (mcv2_exists)
! 		free_attstatsslot(vardata2->atttype, mcv2_values, mcv2_nvalues,
! 						  mcv2_numbers, mcv2_nnumbers);
! 	if (hist1_exists)
! 		free_attstatsslot(vardata1->atttype, hist1_values, hist1_nvalues,
! 						  NULL, 0);
! 	if (hist2_exists)
! 		free_attstatsslot(vardata2->atttype, hist2_values, hist2_nvalues,
! 						  NULL, 0);
  
  	return selec;
  }
--- 371,380 ----
  		selec = (1.0 - nullfrac1) * (1.0 - nullfrac2) * DEFAULT_SEL(operator);
  
  	/* Release stats. */
! 	free_attstatsslot(&mcv1_slot);
! 	free_attstatsslot(&mcv2_slot);
! 	free_attstatsslot(&hist1_slot);
! 	free_attstatsslot(&hist2_slot);
  
  	return selec;
  }
*************** networkjoinsel_semi(Oid operator,
*** 423,464 ****
  	int			opr_codenum;
  	FmgrInfo	proc;
  	int			i,
- 				mcv1_nvalues,
- 				mcv2_nvalues,
- 				mcv1_nnumbers,
- 				mcv2_nnumbers,
- 				hist1_nvalues,
- 				hist2_nvalues,
  				mcv1_length = 0,
  				mcv2_length = 0;
! 	Datum	   *mcv1_values,
! 			   *mcv2_values,
! 			   *hist1_values,
! 			   *hist2_values;
! 	float4	   *mcv1_numbers,
! 			   *mcv2_numbers;
  
  	if (HeapTupleIsValid(vardata1->statsTuple))
  	{
  		stats = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		nullfrac1 = stats->stanullfrac;
  
! 		mcv1_exists = get_attstatsslot(vardata1->statsTuple,
! 									   vardata1->atttype, vardata1->atttypmod,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 									   NULL,
! 									   &mcv1_values, &mcv1_nvalues,
! 									   &mcv1_numbers, &mcv1_nnumbers);
! 		hist1_exists = get_attstatsslot(vardata1->statsTuple,
! 									  vardata1->atttype, vardata1->atttypmod,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										NULL,
! 										&hist1_values, &hist1_nvalues,
! 										NULL, NULL);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv1_length = Min(mcv1_nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv1_exists)
! 			sumcommon1 = mcv_population(mcv1_numbers, mcv1_length);
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple))
--- 403,435 ----
  	int			opr_codenum;
  	FmgrInfo	proc;
  	int			i,
  				mcv1_length = 0,
  				mcv2_length = 0;
! 	AttStatsSlot mcv1_slot;
! 	AttStatsSlot mcv2_slot;
! 	AttStatsSlot hist1_slot;
! 	AttStatsSlot hist2_slot;
  
  	if (HeapTupleIsValid(vardata1->statsTuple))
  	{
  		stats = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		nullfrac1 = stats->stanullfrac;
  
! 		mcv1_exists = get_attstatsslot(&mcv1_slot, vardata1->statsTuple,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 								 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS);
! 		hist1_exists = get_attstatsslot(&hist1_slot, vardata1->statsTuple,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										ATTSTATSSLOT_VALUES);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv1_length = Min(mcv1_slot.nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv1_exists)
! 			sumcommon1 = mcv_population(mcv1_slot.numbers, mcv1_length);
! 	}
! 	else
! 	{
! 		memset(&mcv1_slot, 0, sizeof(mcv1_slot));
! 		memset(&hist1_slot, 0, sizeof(hist1_slot));
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple))
*************** networkjoinsel_semi(Oid operator,
*** 466,487 ****
  		stats = (Form_pg_statistic) GETSTRUCT(vardata2->statsTuple);
  		nullfrac2 = stats->stanullfrac;
  
! 		mcv2_exists = get_attstatsslot(vardata2->statsTuple,
! 									   vardata2->atttype, vardata2->atttypmod,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 									   NULL,
! 									   &mcv2_values, &mcv2_nvalues,
! 									   &mcv2_numbers, &mcv2_nnumbers);
! 		hist2_exists = get_attstatsslot(vardata2->statsTuple,
! 									  vardata2->atttype, vardata2->atttypmod,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										NULL,
! 										&hist2_values, &hist2_nvalues,
! 										NULL, NULL);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv2_length = Min(mcv2_nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv2_exists)
! 			sumcommon2 = mcv_population(mcv2_numbers, mcv2_length);
  	}
  
  	opr_codenum = inet_opr_codenum(operator);
--- 437,457 ----
  		stats = (Form_pg_statistic) GETSTRUCT(vardata2->statsTuple);
  		nullfrac2 = stats->stanullfrac;
  
! 		mcv2_exists = get_attstatsslot(&mcv2_slot, vardata2->statsTuple,
  									   STATISTIC_KIND_MCV, InvalidOid,
! 								 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS);
! 		hist2_exists = get_attstatsslot(&hist2_slot, vardata2->statsTuple,
  										STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 										ATTSTATSSLOT_VALUES);
  		/* Arbitrarily limit number of MCVs considered */
! 		mcv2_length = Min(mcv2_slot.nvalues, MAX_CONSIDERED_ELEMS);
  		if (mcv2_exists)
! 			sumcommon2 = mcv_population(mcv2_slot.numbers, mcv2_length);
! 	}
! 	else
! 	{
! 		memset(&mcv2_slot, 0, sizeof(mcv2_slot));
! 		memset(&hist2_slot, 0, sizeof(hist2_slot));
  	}
  
  	opr_codenum = inet_opr_codenum(operator);
*************** networkjoinsel_semi(Oid operator,
*** 499,508 ****
  	{
  		for (i = 0; i < mcv1_length; i++)
  		{
! 			selec += mcv1_numbers[i] *
! 				inet_semi_join_sel(mcv1_values[i],
! 								   mcv2_exists, mcv2_values, mcv2_length,
! 								   hist2_exists, hist2_values, hist2_nvalues,
  								   hist2_weight,
  								   &proc, opr_codenum);
  		}
--- 469,479 ----
  	{
  		for (i = 0; i < mcv1_length; i++)
  		{
! 			selec += mcv1_slot.numbers[i] *
! 				inet_semi_join_sel(mcv1_slot.values[i],
! 								   mcv2_exists, mcv2_slot.values, mcv2_length,
! 								   hist2_exists,
! 								   hist2_slot.values, hist2_slot.nvalues,
  								   hist2_weight,
  								   &proc, opr_codenum);
  		}
*************** networkjoinsel_semi(Oid operator,
*** 519,539 ****
  	 *
  	 * If there are too many histogram elements, decimate to limit runtime.
  	 */
! 	if (hist1_exists && hist1_nvalues > 2 && (mcv2_exists || hist2_exists))
  	{
  		double		hist_selec_sum = 0.0;
  		int			k,
  					n;
  
! 		k = (hist1_nvalues - 3) / MAX_CONSIDERED_ELEMS + 1;
  
  		n = 0;
! 		for (i = 1; i < hist1_nvalues - 1; i += k)
  		{
  			hist_selec_sum +=
! 				inet_semi_join_sel(hist1_values[i],
! 								   mcv2_exists, mcv2_values, mcv2_length,
! 								   hist2_exists, hist2_values, hist2_nvalues,
  								   hist2_weight,
  								   &proc, opr_codenum);
  			n++;
--- 490,511 ----
  	 *
  	 * If there are too many histogram elements, decimate to limit runtime.
  	 */
! 	if (hist1_exists && hist1_slot.nvalues > 2 && (mcv2_exists || hist2_exists))
  	{
  		double		hist_selec_sum = 0.0;
  		int			k,
  					n;
  
! 		k = (hist1_slot.nvalues - 3) / MAX_CONSIDERED_ELEMS + 1;
  
  		n = 0;
! 		for (i = 1; i < hist1_slot.nvalues - 1; i += k)
  		{
  			hist_selec_sum +=
! 				inet_semi_join_sel(hist1_slot.values[i],
! 								   mcv2_exists, mcv2_slot.values, mcv2_length,
! 								   hist2_exists,
! 								   hist2_slot.values, hist2_slot.nvalues,
  								   hist2_weight,
  								   &proc, opr_codenum);
  			n++;
*************** networkjoinsel_semi(Oid operator,
*** 550,567 ****
  		selec = (1.0 - nullfrac1) * (1.0 - nullfrac2) * DEFAULT_SEL(operator);
  
  	/* Release stats. */
! 	if (mcv1_exists)
! 		free_attstatsslot(vardata1->atttype, mcv1_values, mcv1_nvalues,
! 						  mcv1_numbers, mcv1_nnumbers);
! 	if (mcv2_exists)
! 		free_attstatsslot(vardata2->atttype, mcv2_values, mcv2_nvalues,
! 						  mcv2_numbers, mcv2_nnumbers);
! 	if (hist1_exists)
! 		free_attstatsslot(vardata1->atttype, hist1_values, hist1_nvalues,
! 						  NULL, 0);
! 	if (hist2_exists)
! 		free_attstatsslot(vardata2->atttype, hist2_values, hist2_nvalues,
! 						  NULL, 0);
  
  	return selec;
  }
--- 522,531 ----
  		selec = (1.0 - nullfrac1) * (1.0 - nullfrac2) * DEFAULT_SEL(operator);
  
  	/* Release stats. */
! 	free_attstatsslot(&mcv1_slot);
! 	free_attstatsslot(&mcv2_slot);
! 	free_attstatsslot(&hist1_slot);
! 	free_attstatsslot(&hist2_slot);
  
  	return selec;
  }
diff --git a/src/backend/utils/adt/rangetypes_selfuncs.c b/src/backend/utils/adt/rangetypes_selfuncs.c
index dbf1929..c4c5496 100644
*** a/src/backend/utils/adt/rangetypes_selfuncs.c
--- b/src/backend/utils/adt/rangetypes_selfuncs.c
*************** calc_rangesel(TypeCacheEntry *typcache, 
*** 239,263 ****
  	if (HeapTupleIsValid(vardata->statsTuple))
  	{
  		Form_pg_statistic stats;
! 		float4	   *numbers;
! 		int			nnumbers;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  		null_frac = stats->stanullfrac;
  
  		/* Try to get fraction of empty ranges */
! 		if (get_attstatsslot(vardata->statsTuple,
! 							 FLOAT8OID, -1,
  							 STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM,
  							 InvalidOid,
! 							 NULL,
! 							 NULL, NULL,
! 							 &numbers, &nnumbers))
  		{
! 			if (nnumbers != 1)
  				elog(ERROR, "invalid empty fraction statistic");		/* shouldn't happen */
! 			empty_frac = numbers[0];
! 			free_attstatsslot(FLOAT8OID, NULL, 0, numbers, nnumbers);
  		}
  		else
  		{
--- 239,259 ----
  	if (HeapTupleIsValid(vardata->statsTuple))
  	{
  		Form_pg_statistic stats;
! 		AttStatsSlot sslot;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  		null_frac = stats->stanullfrac;
  
  		/* Try to get fraction of empty ranges */
! 		if (get_attstatsslot(&sslot, vardata->statsTuple,
  							 STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM,
  							 InvalidOid,
! 							 ATTSTATSSLOT_NUMBERS))
  		{
! 			if (sslot.nnumbers != 1)
  				elog(ERROR, "invalid empty fraction statistic");		/* shouldn't happen */
! 			empty_frac = sslot.numbers[0];
! 			free_attstatsslot(&sslot);
  		}
  		else
  		{
*************** static double
*** 374,383 ****
  calc_hist_selectivity(TypeCacheEntry *typcache, VariableStatData *vardata,
  					  RangeType *constval, Oid operator)
  {
! 	Datum	   *hist_values;
  	int			nhist;
- 	Datum	   *length_hist_values = NULL;
- 	int			length_nhist = 0;
  	RangeBound *hist_lower;
  	RangeBound *hist_upper;
  	int			i;
--- 370,378 ----
  calc_hist_selectivity(TypeCacheEntry *typcache, VariableStatData *vardata,
  					  RangeType *constval, Oid operator)
  {
! 	AttStatsSlot hslot;
! 	AttStatsSlot lslot;
  	int			nhist;
  	RangeBound *hist_lower;
  	RangeBound *hist_upper;
  	int			i;
*************** calc_hist_selectivity(TypeCacheEntry *ty
*** 397,419 ****
  
  	/* Try to get histogram of ranges */
  	if (!(HeapTupleIsValid(vardata->statsTuple) &&
! 		  get_attstatsslot(vardata->statsTuple,
! 						   vardata->atttype, vardata->atttypmod,
  						   STATISTIC_KIND_BOUNDS_HISTOGRAM, InvalidOid,
! 						   NULL,
! 						   &hist_values, &nhist,
! 						   NULL, NULL)))
  		return -1.0;
  
  	/*
  	 * Convert histogram of ranges into histograms of its lower and upper
  	 * bounds.
  	 */
  	hist_lower = (RangeBound *) palloc(sizeof(RangeBound) * nhist);
  	hist_upper = (RangeBound *) palloc(sizeof(RangeBound) * nhist);
  	for (i = 0; i < nhist; i++)
  	{
! 		range_deserialize(typcache, DatumGetRangeType(hist_values[i]),
  						  &hist_lower[i], &hist_upper[i], &empty);
  		/* The histogram should not contain any empty ranges */
  		if (empty)
--- 392,412 ----
  
  	/* Try to get histogram of ranges */
  	if (!(HeapTupleIsValid(vardata->statsTuple) &&
! 		  get_attstatsslot(&hslot, vardata->statsTuple,
  						   STATISTIC_KIND_BOUNDS_HISTOGRAM, InvalidOid,
! 						   ATTSTATSSLOT_VALUES)))
  		return -1.0;
  
  	/*
  	 * Convert histogram of ranges into histograms of its lower and upper
  	 * bounds.
  	 */
+ 	nhist = hslot.nvalues;
  	hist_lower = (RangeBound *) palloc(sizeof(RangeBound) * nhist);
  	hist_upper = (RangeBound *) palloc(sizeof(RangeBound) * nhist);
  	for (i = 0; i < nhist; i++)
  	{
! 		range_deserialize(typcache, DatumGetRangeType(hslot.values[i]),
  						  &hist_lower[i], &hist_upper[i], &empty);
  		/* The histogram should not contain any empty ranges */
  		if (empty)
*************** calc_hist_selectivity(TypeCacheEntry *ty
*** 425,451 ****
  		operator == OID_RANGE_CONTAINED_OP)
  	{
  		if (!(HeapTupleIsValid(vardata->statsTuple) &&
! 			  get_attstatsslot(vardata->statsTuple,
! 							   FLOAT8OID, -1,
  							   STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM,
  							   InvalidOid,
! 							   NULL,
! 							   &length_hist_values, &length_nhist,
! 							   NULL, NULL)))
  		{
! 			free_attstatsslot(vardata->atttype, hist_values, nhist, NULL, 0);
  			return -1.0;
  		}
  
  		/* check that it's a histogram, not just a dummy entry */
! 		if (length_nhist < 2)
  		{
! 			free_attstatsslot(FLOAT8OID,
! 							  length_hist_values, length_nhist, NULL, 0);
! 			free_attstatsslot(vardata->atttype, hist_values, nhist, NULL, 0);
  			return -1.0;
  		}
  	}
  
  	/* Extract the bounds of the constant value. */
  	range_deserialize(typcache, constval, &const_lower, &const_upper, &empty);
--- 418,442 ----
  		operator == OID_RANGE_CONTAINED_OP)
  	{
  		if (!(HeapTupleIsValid(vardata->statsTuple) &&
! 			  get_attstatsslot(&lslot, vardata->statsTuple,
  							   STATISTIC_KIND_RANGE_LENGTH_HISTOGRAM,
  							   InvalidOid,
! 							   ATTSTATSSLOT_VALUES)))
  		{
! 			free_attstatsslot(&hslot);
  			return -1.0;
  		}
  
  		/* check that it's a histogram, not just a dummy entry */
! 		if (lslot.nvalues < 2)
  		{
! 			free_attstatsslot(&lslot);
! 			free_attstatsslot(&hslot);
  			return -1.0;
  		}
  	}
+ 	else
+ 		memset(&lslot, 0, sizeof(lslot));
  
  	/* Extract the bounds of the constant value. */
  	range_deserialize(typcache, constval, &const_lower, &const_upper, &empty);
*************** calc_hist_selectivity(TypeCacheEntry *ty
*** 545,551 ****
  			hist_selec =
  				calc_hist_selectivity_contains(typcache, &const_lower,
  											 &const_upper, hist_lower, nhist,
! 										   length_hist_values, length_nhist);
  			break;
  
  		case OID_RANGE_CONTAINED_OP:
--- 536,542 ----
  			hist_selec =
  				calc_hist_selectivity_contains(typcache, &const_lower,
  											 &const_upper, hist_lower, nhist,
! 											   lslot.values, lslot.nvalues);
  			break;
  
  		case OID_RANGE_CONTAINED_OP:
*************** calc_hist_selectivity(TypeCacheEntry *ty
*** 570,576 ****
  				hist_selec =
  					calc_hist_selectivity_contained(typcache, &const_lower,
  											 &const_upper, hist_lower, nhist,
! 										   length_hist_values, length_nhist);
  			}
  			break;
  
--- 561,567 ----
  				hist_selec =
  					calc_hist_selectivity_contained(typcache, &const_lower,
  											 &const_upper, hist_lower, nhist,
! 												lslot.values, lslot.nvalues);
  			}
  			break;
  
*************** calc_hist_selectivity(TypeCacheEntry *ty
*** 580,588 ****
  			break;
  	}
  
! 	free_attstatsslot(FLOAT8OID,
! 					  length_hist_values, length_nhist, NULL, 0);
! 	free_attstatsslot(vardata->atttype, hist_values, nhist, NULL, 0);
  
  	return hist_selec;
  }
--- 571,578 ----
  			break;
  	}
  
! 	free_attstatsslot(&lslot);
! 	free_attstatsslot(&hslot);
  
  	return hist_selec;
  }
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c
index 9b157f4..6c4cef9 100644
*** a/src/backend/utils/adt/selfuncs.c
--- b/src/backend/utils/adt/selfuncs.c
*************** var_eq_const(VariableStatData *vardata, 
*** 299,308 ****
  									  (opfuncoid = get_opcode(operator))))
  	{
  		Form_pg_statistic stats;
! 		Datum	   *values;
! 		int			nvalues;
! 		float4	   *numbers;
! 		int			nnumbers;
  		bool		match = false;
  		int			i;
  
--- 299,305 ----
  									  (opfuncoid = get_opcode(operator))))
  	{
  		Form_pg_statistic stats;
! 		AttStatsSlot sslot;
  		bool		match = false;
  		int			i;
  
*************** var_eq_const(VariableStatData *vardata, 
*** 315,344 ****
  		 * don't like this, maybe you shouldn't be using eqsel for your
  		 * operator...)
  		 */
! 		if (get_attstatsslot(vardata->statsTuple,
! 							 vardata->atttype, vardata->atttypmod,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 NULL,
! 							 &values, &nvalues,
! 							 &numbers, &nnumbers))
  		{
  			FmgrInfo	eqproc;
  
  			fmgr_info(opfuncoid, &eqproc);
  
! 			for (i = 0; i < nvalues; i++)
  			{
  				/* be careful to apply operator right way 'round */
  				if (varonleft)
  					match = DatumGetBool(FunctionCall2Coll(&eqproc,
  													   DEFAULT_COLLATION_OID,
! 														   values[i],
  														   constval));
  				else
  					match = DatumGetBool(FunctionCall2Coll(&eqproc,
  													   DEFAULT_COLLATION_OID,
  														   constval,
! 														   values[i]));
  				if (match)
  					break;
  			}
--- 312,338 ----
  		 * don't like this, maybe you shouldn't be using eqsel for your
  		 * operator...)
  		 */
! 		if (get_attstatsslot(&sslot, vardata->statsTuple,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS))
  		{
  			FmgrInfo	eqproc;
  
  			fmgr_info(opfuncoid, &eqproc);
  
! 			for (i = 0; i < sslot.nvalues; i++)
  			{
  				/* be careful to apply operator right way 'round */
  				if (varonleft)
  					match = DatumGetBool(FunctionCall2Coll(&eqproc,
  													   DEFAULT_COLLATION_OID,
! 														   sslot.values[i],
  														   constval));
  				else
  					match = DatumGetBool(FunctionCall2Coll(&eqproc,
  													   DEFAULT_COLLATION_OID,
  														   constval,
! 														   sslot.values[i]));
  				if (match)
  					break;
  			}
*************** var_eq_const(VariableStatData *vardata, 
*** 346,354 ****
  		else
  		{
  			/* no most-common-value info available */
! 			values = NULL;
! 			numbers = NULL;
! 			i = nvalues = nnumbers = 0;
  		}
  
  		if (match)
--- 340,346 ----
  		else
  		{
  			/* no most-common-value info available */
! 			i = 0;				/* keep compiler quiet */
  		}
  
  		if (match)
*************** var_eq_const(VariableStatData *vardata, 
*** 357,363 ****
  			 * Constant is "=" to this common value.  We know selectivity
  			 * exactly (or as exactly as ANALYZE could calculate it, anyway).
  			 */
! 			selec = numbers[i];
  		}
  		else
  		{
--- 349,355 ----
  			 * Constant is "=" to this common value.  We know selectivity
  			 * exactly (or as exactly as ANALYZE could calculate it, anyway).
  			 */
! 			selec = sslot.numbers[i];
  		}
  		else
  		{
*************** var_eq_const(VariableStatData *vardata, 
*** 369,376 ****
  			double		sumcommon = 0.0;
  			double		otherdistinct;
  
! 			for (i = 0; i < nnumbers; i++)
! 				sumcommon += numbers[i];
  			selec = 1.0 - sumcommon - stats->stanullfrac;
  			CLAMP_PROBABILITY(selec);
  
--- 361,368 ----
  			double		sumcommon = 0.0;
  			double		otherdistinct;
  
! 			for (i = 0; i < sslot.nnumbers; i++)
! 				sumcommon += sslot.numbers[i];
  			selec = 1.0 - sumcommon - stats->stanullfrac;
  			CLAMP_PROBABILITY(selec);
  
*************** var_eq_const(VariableStatData *vardata, 
*** 379,385 ****
  			 * all the not-common values share this remaining fraction
  			 * equally, so we divide by the number of other distinct values.
  			 */
! 			otherdistinct = get_variable_numdistinct(vardata, &isdefault) - nnumbers;
  			if (otherdistinct > 1)
  				selec /= otherdistinct;
  
--- 371,378 ----
  			 * all the not-common values share this remaining fraction
  			 * equally, so we divide by the number of other distinct values.
  			 */
! 			otherdistinct = get_variable_numdistinct(vardata, &isdefault) -
! 				sslot.nnumbers;
  			if (otherdistinct > 1)
  				selec /= otherdistinct;
  
*************** var_eq_const(VariableStatData *vardata, 
*** 387,398 ****
  			 * Another cross-check: selectivity shouldn't be estimated as more
  			 * than the least common "most common value".
  			 */
! 			if (nnumbers > 0 && selec > numbers[nnumbers - 1])
! 				selec = numbers[nnumbers - 1];
  		}
  
! 		free_attstatsslot(vardata->atttype, values, nvalues,
! 						  numbers, nnumbers);
  	}
  	else
  	{
--- 380,390 ----
  			 * Another cross-check: selectivity shouldn't be estimated as more
  			 * than the least common "most common value".
  			 */
! 			if (sslot.nnumbers > 0 && selec > sslot.numbers[sslot.nnumbers - 1])
! 				selec = sslot.numbers[sslot.nnumbers - 1];
  		}
  
! 		free_attstatsslot(&sslot);
  	}
  	else
  	{
*************** var_eq_non_const(VariableStatData *varda
*** 435,442 ****
  	{
  		Form_pg_statistic stats;
  		double		ndistinct;
! 		float4	   *numbers;
! 		int			nnumbers;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  
--- 427,433 ----
  	{
  		Form_pg_statistic stats;
  		double		ndistinct;
! 		AttStatsSlot sslot;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata->statsTuple);
  
*************** var_eq_non_const(VariableStatData *varda
*** 459,474 ****
  		 * Cross-check: selectivity should never be estimated as more than the
  		 * most common value's.
  		 */
! 		if (get_attstatsslot(vardata->statsTuple,
! 							 vardata->atttype, vardata->atttypmod,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 NULL,
! 							 NULL, NULL,
! 							 &numbers, &nnumbers))
  		{
! 			if (nnumbers > 0 && selec > numbers[0])
! 				selec = numbers[0];
! 			free_attstatsslot(vardata->atttype, NULL, 0, numbers, nnumbers);
  		}
  	}
  	else
--- 450,462 ----
  		 * Cross-check: selectivity should never be estimated as more than the
  		 * most common value's.
  		 */
! 		if (get_attstatsslot(&sslot, vardata->statsTuple,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 ATTSTATSSLOT_NUMBERS))
  		{
! 			if (sslot.nnumbers > 0 && selec > sslot.numbers[0])
! 				selec = sslot.numbers[0];
! 			free_attstatsslot(&sslot);
  		}
  	}
  	else
*************** mcv_selectivity(VariableStatData *vardat
*** 620,629 ****
  {
  	double		mcv_selec,
  				sumcommon;
! 	Datum	   *values;
! 	int			nvalues;
! 	float4	   *numbers;
! 	int			nnumbers;
  	int			i;
  
  	mcv_selec = 0.0;
--- 608,614 ----
  {
  	double		mcv_selec,
  				sumcommon;
! 	AttStatsSlot sslot;
  	int			i;
  
  	mcv_selec = 0.0;
*************** mcv_selectivity(VariableStatData *vardat
*** 631,659 ****
  
  	if (HeapTupleIsValid(vardata->statsTuple) &&
  		statistic_proc_security_check(vardata, opproc->fn_oid) &&
! 		get_attstatsslot(vardata->statsTuple,
! 						 vardata->atttype, vardata->atttypmod,
  						 STATISTIC_KIND_MCV, InvalidOid,
! 						 NULL,
! 						 &values, &nvalues,
! 						 &numbers, &nnumbers))
  	{
! 		for (i = 0; i < nvalues; i++)
  		{
  			if (varonleft ?
  				DatumGetBool(FunctionCall2Coll(opproc,
  											   DEFAULT_COLLATION_OID,
! 											   values[i],
  											   constval)) :
  				DatumGetBool(FunctionCall2Coll(opproc,
  											   DEFAULT_COLLATION_OID,
  											   constval,
! 											   values[i])))
! 				mcv_selec += numbers[i];
! 			sumcommon += numbers[i];
  		}
! 		free_attstatsslot(vardata->atttype, values, nvalues,
! 						  numbers, nnumbers);
  	}
  
  	*sumcommonp = sumcommon;
--- 616,640 ----
  
  	if (HeapTupleIsValid(vardata->statsTuple) &&
  		statistic_proc_security_check(vardata, opproc->fn_oid) &&
! 		get_attstatsslot(&sslot, vardata->statsTuple,
  						 STATISTIC_KIND_MCV, InvalidOid,
! 						 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS))
  	{
! 		for (i = 0; i < sslot.nvalues; i++)
  		{
  			if (varonleft ?
  				DatumGetBool(FunctionCall2Coll(opproc,
  											   DEFAULT_COLLATION_OID,
! 											   sslot.values[i],
  											   constval)) :
  				DatumGetBool(FunctionCall2Coll(opproc,
  											   DEFAULT_COLLATION_OID,
  											   constval,
! 											   sslot.values[i])))
! 				mcv_selec += sslot.numbers[i];
! 			sumcommon += sslot.numbers[i];
  		}
! 		free_attstatsslot(&sslot);
  	}
  
  	*sumcommonp = sumcommon;
*************** histogram_selectivity(VariableStatData *
*** 699,706 ****
  					  int *hist_size)
  {
  	double		result;
! 	Datum	   *values;
! 	int			nvalues;
  
  	/* check sanity of parameters */
  	Assert(n_skip >= 0);
--- 680,686 ----
  					  int *hist_size)
  {
  	double		result;
! 	AttStatsSlot sslot;
  
  	/* check sanity of parameters */
  	Assert(n_skip >= 0);
*************** histogram_selectivity(VariableStatData *
*** 708,744 ****
  
  	if (HeapTupleIsValid(vardata->statsTuple) &&
  		statistic_proc_security_check(vardata, opproc->fn_oid) &&
! 		get_attstatsslot(vardata->statsTuple,
! 						 vardata->atttype, vardata->atttypmod,
  						 STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 						 NULL,
! 						 &values, &nvalues,
! 						 NULL, NULL))
  	{
! 		*hist_size = nvalues;
! 		if (nvalues >= min_hist_size)
  		{
  			int			nmatch = 0;
  			int			i;
  
! 			for (i = n_skip; i < nvalues - n_skip; i++)
  			{
  				if (varonleft ?
  					DatumGetBool(FunctionCall2Coll(opproc,
  												   DEFAULT_COLLATION_OID,
! 												   values[i],
  												   constval)) :
  					DatumGetBool(FunctionCall2Coll(opproc,
  												   DEFAULT_COLLATION_OID,
  												   constval,
! 												   values[i])))
  					nmatch++;
  			}
! 			result = ((double) nmatch) / ((double) (nvalues - 2 * n_skip));
  		}
  		else
  			result = -1;
! 		free_attstatsslot(vardata->atttype, values, nvalues, NULL, 0);
  	}
  	else
  	{
--- 688,721 ----
  
  	if (HeapTupleIsValid(vardata->statsTuple) &&
  		statistic_proc_security_check(vardata, opproc->fn_oid) &&
! 		get_attstatsslot(&sslot, vardata->statsTuple,
  						 STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 						 ATTSTATSSLOT_VALUES))
  	{
! 		*hist_size = sslot.nvalues;
! 		if (sslot.nvalues >= min_hist_size)
  		{
  			int			nmatch = 0;
  			int			i;
  
! 			for (i = n_skip; i < sslot.nvalues - n_skip; i++)
  			{
  				if (varonleft ?
  					DatumGetBool(FunctionCall2Coll(opproc,
  												   DEFAULT_COLLATION_OID,
! 												   sslot.values[i],
  												   constval)) :
  					DatumGetBool(FunctionCall2Coll(opproc,
  												   DEFAULT_COLLATION_OID,
  												   constval,
! 												   sslot.values[i])))
  					nmatch++;
  			}
! 			result = ((double) nmatch) / ((double) (sslot.nvalues - 2 * n_skip));
  		}
  		else
  			result = -1;
! 		free_attstatsslot(&sslot);
  	}
  	else
  	{
*************** ineq_histogram_selectivity(PlannerInfo *
*** 768,776 ****
  						   Datum constval, Oid consttype)
  {
  	double		hist_selec;
! 	Oid			hist_op;
! 	Datum	   *values;
! 	int			nvalues;
  
  	hist_selec = -1.0;
  
--- 745,751 ----
  						   Datum constval, Oid consttype)
  {
  	double		hist_selec;
! 	AttStatsSlot sslot;
  
  	hist_selec = -1.0;
  
*************** ineq_histogram_selectivity(PlannerInfo *
*** 786,799 ****
  	 */
  	if (HeapTupleIsValid(vardata->statsTuple) &&
  		statistic_proc_security_check(vardata, opproc->fn_oid) &&
! 		get_attstatsslot(vardata->statsTuple,
! 						 vardata->atttype, vardata->atttypmod,
  						 STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 						 &hist_op,
! 						 &values, &nvalues,
! 						 NULL, NULL))
  	{
! 		if (nvalues > 1)
  		{
  			/*
  			 * Use binary search to find proper location, ie, the first slot
--- 761,771 ----
  	 */
  	if (HeapTupleIsValid(vardata->statsTuple) &&
  		statistic_proc_security_check(vardata, opproc->fn_oid) &&
! 		get_attstatsslot(&sslot, vardata->statsTuple,
  						 STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 						 ATTSTATSSLOT_VALUES))
  	{
! 		if (sslot.nvalues > 1)
  		{
  			/*
  			 * Use binary search to find proper location, ie, the first slot
*************** ineq_histogram_selectivity(PlannerInfo *
*** 812,818 ****
  			 */
  			double		histfrac;
  			int			lobound = 0;	/* first possible slot to search */
! 			int			hibound = nvalues;		/* last+1 slot to search */
  			bool		have_end = false;
  
  			/*
--- 784,790 ----
  			 */
  			double		histfrac;
  			int			lobound = 0;	/* first possible slot to search */
! 			int			hibound = sslot.nvalues;		/* last+1 slot to search */
  			bool		have_end = false;
  
  			/*
*************** ineq_histogram_selectivity(PlannerInfo *
*** 821,832 ****
  			 * one of them to be updated, so we deal with that within the
  			 * loop.)
  			 */
! 			if (nvalues == 2)
  				have_end = get_actual_variable_range(root,
  													 vardata,
! 													 hist_op,
! 													 &values[0],
! 													 &values[1]);
  
  			while (lobound < hibound)
  			{
--- 793,804 ----
  			 * one of them to be updated, so we deal with that within the
  			 * loop.)
  			 */
! 			if (sslot.nvalues == 2)
  				have_end = get_actual_variable_range(root,
  													 vardata,
! 													 sslot.staop,
! 													 &sslot.values[0],
! 													 &sslot.values[1]);
  
  			while (lobound < hibound)
  			{
*************** ineq_histogram_selectivity(PlannerInfo *
*** 838,859 ****
  				 * histogram entry, first try to replace it with the actual
  				 * current min or max (unless we already did so above).
  				 */
! 				if (probe == 0 && nvalues > 2)
  					have_end = get_actual_variable_range(root,
  														 vardata,
! 														 hist_op,
! 														 &values[0],
  														 NULL);
! 				else if (probe == nvalues - 1 && nvalues > 2)
  					have_end = get_actual_variable_range(root,
  														 vardata,
! 														 hist_op,
  														 NULL,
! 														 &values[probe]);
  
  				ltcmp = DatumGetBool(FunctionCall2Coll(opproc,
  													   DEFAULT_COLLATION_OID,
! 													   values[probe],
  													   constval));
  				if (isgt)
  					ltcmp = !ltcmp;
--- 810,831 ----
  				 * histogram entry, first try to replace it with the actual
  				 * current min or max (unless we already did so above).
  				 */
! 				if (probe == 0 && sslot.nvalues > 2)
  					have_end = get_actual_variable_range(root,
  														 vardata,
! 														 sslot.staop,
! 														 &sslot.values[0],
  														 NULL);
! 				else if (probe == sslot.nvalues - 1 && sslot.nvalues > 2)
  					have_end = get_actual_variable_range(root,
  														 vardata,
! 														 sslot.staop,
  														 NULL,
! 													   &sslot.values[probe]);
  
  				ltcmp = DatumGetBool(FunctionCall2Coll(opproc,
  													   DEFAULT_COLLATION_OID,
! 													   sslot.values[probe],
  													   constval));
  				if (isgt)
  					ltcmp = !ltcmp;
*************** ineq_histogram_selectivity(PlannerInfo *
*** 868,874 ****
  				/* Constant is below lower histogram boundary. */
  				histfrac = 0.0;
  			}
! 			else if (lobound >= nvalues)
  			{
  				/* Constant is above upper histogram boundary. */
  				histfrac = 1.0;
--- 840,846 ----
  				/* Constant is below lower histogram boundary. */
  				histfrac = 0.0;
  			}
! 			else if (lobound >= sslot.nvalues)
  			{
  				/* Constant is above upper histogram boundary. */
  				histfrac = 1.0;
*************** ineq_histogram_selectivity(PlannerInfo *
*** 889,895 ****
  				 * interpolation within this bin.
  				 */
  				if (convert_to_scalar(constval, consttype, &val,
! 									  values[i - 1], values[i],
  									  vardata->vartype,
  									  &low, &high))
  				{
--- 861,867 ----
  				 * interpolation within this bin.
  				 */
  				if (convert_to_scalar(constval, consttype, &val,
! 									  sslot.values[i - 1], sslot.values[i],
  									  vardata->vartype,
  									  &low, &high))
  				{
*************** ineq_histogram_selectivity(PlannerInfo *
*** 936,942 ****
  				 * binfrac partial bin below the constant.
  				 */
  				histfrac = (double) (i - 1) + binfrac;
! 				histfrac /= (double) (nvalues - 1);
  			}
  
  			/*
--- 908,914 ----
  				 * binfrac partial bin below the constant.
  				 */
  				histfrac = (double) (i - 1) + binfrac;
! 				histfrac /= (double) (sslot.nvalues - 1);
  			}
  
  			/*
*************** ineq_histogram_selectivity(PlannerInfo *
*** 964,970 ****
  			}
  		}
  
! 		free_attstatsslot(vardata->atttype, values, nvalues, NULL, 0);
  	}
  
  	return hist_selec;
--- 936,942 ----
  			}
  		}
  
! 		free_attstatsslot(&sslot);
  	}
  
  	return hist_selec;
*************** booltestsel(PlannerInfo *root, BoolTestT
*** 1517,1537 ****
  	{
  		Form_pg_statistic stats;
  		double		freq_null;
! 		Datum	   *values;
! 		int			nvalues;
! 		float4	   *numbers;
! 		int			nnumbers;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata.statsTuple);
  		freq_null = stats->stanullfrac;
  
! 		if (get_attstatsslot(vardata.statsTuple,
! 							 vardata.atttype, vardata.atttypmod,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 NULL,
! 							 &values, &nvalues,
! 							 &numbers, &nnumbers)
! 			&& nnumbers > 0)
  		{
  			double		freq_true;
  			double		freq_false;
--- 1489,1503 ----
  	{
  		Form_pg_statistic stats;
  		double		freq_null;
! 		AttStatsSlot sslot;
  
  		stats = (Form_pg_statistic) GETSTRUCT(vardata.statsTuple);
  		freq_null = stats->stanullfrac;
  
! 		if (get_attstatsslot(&sslot, vardata.statsTuple,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS)
! 			&& sslot.nnumbers > 0)
  		{
  			double		freq_true;
  			double		freq_false;
*************** booltestsel(PlannerInfo *root, BoolTestT
*** 1539,1548 ****
  			/*
  			 * Get first MCV frequency and derive frequency for true.
  			 */
! 			if (DatumGetBool(values[0]))
! 				freq_true = numbers[0];
  			else
! 				freq_true = 1.0 - numbers[0] - freq_null;
  
  			/*
  			 * Next derive frequency for false. Then use these as appropriate
--- 1505,1514 ----
  			/*
  			 * Get first MCV frequency and derive frequency for true.
  			 */
! 			if (DatumGetBool(sslot.values[0]))
! 				freq_true = sslot.numbers[0];
  			else
! 				freq_true = 1.0 - sslot.numbers[0] - freq_null;
  
  			/*
  			 * Next derive frequency for false. Then use these as appropriate
*************** booltestsel(PlannerInfo *root, BoolTestT
*** 1583,1590 ****
  					break;
  			}
  
! 			free_attstatsslot(vardata.atttype, values, nvalues,
! 							  numbers, nnumbers);
  		}
  		else
  		{
--- 1549,1555 ----
  					break;
  			}
  
! 			free_attstatsslot(&sslot);
  		}
  		else
  		{
*************** eqjoinsel_inner(Oid operator,
*** 2274,2307 ****
  	Form_pg_statistic stats1 = NULL;
  	Form_pg_statistic stats2 = NULL;
  	bool		have_mcvs1 = false;
- 	Datum	   *values1 = NULL;
- 	int			nvalues1 = 0;
- 	float4	   *numbers1 = NULL;
- 	int			nnumbers1 = 0;
  	bool		have_mcvs2 = false;
! 	Datum	   *values2 = NULL;
! 	int			nvalues2 = 0;
! 	float4	   *numbers2 = NULL;
! 	int			nnumbers2 = 0;
  
  	nd1 = get_variable_numdistinct(vardata1, &isdefault1);
  	nd2 = get_variable_numdistinct(vardata2, &isdefault2);
  
  	opfuncoid = get_opcode(operator);
  
  	if (HeapTupleIsValid(vardata1->statsTuple))
  	{
  		/* note we allow use of nullfrac regardless of security check */
  		stats1 = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		if (statistic_proc_security_check(vardata1, opfuncoid))
! 			have_mcvs1 = get_attstatsslot(vardata1->statsTuple,
! 										  vardata1->atttype,
! 										  vardata1->atttypmod,
! 										  STATISTIC_KIND_MCV,
! 										  InvalidOid,
! 										  NULL,
! 										  &values1, &nvalues1,
! 										  &numbers1, &nnumbers1);
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple))
--- 2239,2264 ----
  	Form_pg_statistic stats1 = NULL;
  	Form_pg_statistic stats2 = NULL;
  	bool		have_mcvs1 = false;
  	bool		have_mcvs2 = false;
! 	AttStatsSlot sslot1;
! 	AttStatsSlot sslot2;
  
  	nd1 = get_variable_numdistinct(vardata1, &isdefault1);
  	nd2 = get_variable_numdistinct(vardata2, &isdefault2);
  
  	opfuncoid = get_opcode(operator);
  
+ 	memset(&sslot1, 0, sizeof(sslot1));
+ 	memset(&sslot2, 0, sizeof(sslot2));
+ 
  	if (HeapTupleIsValid(vardata1->statsTuple))
  	{
  		/* note we allow use of nullfrac regardless of security check */
  		stats1 = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		if (statistic_proc_security_check(vardata1, opfuncoid))
! 			have_mcvs1 = get_attstatsslot(&sslot1, vardata1->statsTuple,
! 										  STATISTIC_KIND_MCV, InvalidOid,
! 								 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS);
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple))
*************** eqjoinsel_inner(Oid operator,
*** 2309,2322 ****
  		/* note we allow use of nullfrac regardless of security check */
  		stats2 = (Form_pg_statistic) GETSTRUCT(vardata2->statsTuple);
  		if (statistic_proc_security_check(vardata2, opfuncoid))
! 			have_mcvs2 = get_attstatsslot(vardata2->statsTuple,
! 										  vardata2->atttype,
! 										  vardata2->atttypmod,
! 										  STATISTIC_KIND_MCV,
! 										  InvalidOid,
! 										  NULL,
! 										  &values2, &nvalues2,
! 										  &numbers2, &nnumbers2);
  	}
  
  	if (have_mcvs1 && have_mcvs2)
--- 2266,2274 ----
  		/* note we allow use of nullfrac regardless of security check */
  		stats2 = (Form_pg_statistic) GETSTRUCT(vardata2->statsTuple);
  		if (statistic_proc_security_check(vardata2, opfuncoid))
! 			have_mcvs2 = get_attstatsslot(&sslot2, vardata2->statsTuple,
! 										  STATISTIC_KIND_MCV, InvalidOid,
! 								 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS);
  	}
  
  	if (have_mcvs1 && have_mcvs2)
*************** eqjoinsel_inner(Oid operator,
*** 2351,2358 ****
  					nmatches;
  
  		fmgr_info(opfuncoid, &eqproc);
! 		hasmatch1 = (bool *) palloc0(nvalues1 * sizeof(bool));
! 		hasmatch2 = (bool *) palloc0(nvalues2 * sizeof(bool));
  
  		/*
  		 * Note we assume that each MCV will match at most one member of the
--- 2303,2310 ----
  					nmatches;
  
  		fmgr_info(opfuncoid, &eqproc);
! 		hasmatch1 = (bool *) palloc0(sslot1.nvalues * sizeof(bool));
! 		hasmatch2 = (bool *) palloc0(sslot2.nvalues * sizeof(bool));
  
  		/*
  		 * Note we assume that each MCV will match at most one member of the
*************** eqjoinsel_inner(Oid operator,
*** 2362,2382 ****
  		 */
  		matchprodfreq = 0.0;
  		nmatches = 0;
! 		for (i = 0; i < nvalues1; i++)
  		{
  			int			j;
  
! 			for (j = 0; j < nvalues2; j++)
  			{
  				if (hasmatch2[j])
  					continue;
  				if (DatumGetBool(FunctionCall2Coll(&eqproc,
  												   DEFAULT_COLLATION_OID,
! 												   values1[i],
! 												   values2[j])))
  				{
  					hasmatch1[i] = hasmatch2[j] = true;
! 					matchprodfreq += numbers1[i] * numbers2[j];
  					nmatches++;
  					break;
  				}
--- 2314,2334 ----
  		 */
  		matchprodfreq = 0.0;
  		nmatches = 0;
! 		for (i = 0; i < sslot1.nvalues; i++)
  		{
  			int			j;
  
! 			for (j = 0; j < sslot2.nvalues; j++)
  			{
  				if (hasmatch2[j])
  					continue;
  				if (DatumGetBool(FunctionCall2Coll(&eqproc,
  												   DEFAULT_COLLATION_OID,
! 												   sslot1.values[i],
! 												   sslot2.values[j])))
  				{
  					hasmatch1[i] = hasmatch2[j] = true;
! 					matchprodfreq += sslot1.numbers[i] * sslot2.numbers[j];
  					nmatches++;
  					break;
  				}
*************** eqjoinsel_inner(Oid operator,
*** 2385,2406 ****
  		CLAMP_PROBABILITY(matchprodfreq);
  		/* Sum up frequencies of matched and unmatched MCVs */
  		matchfreq1 = unmatchfreq1 = 0.0;
! 		for (i = 0; i < nvalues1; i++)
  		{
  			if (hasmatch1[i])
! 				matchfreq1 += numbers1[i];
  			else
! 				unmatchfreq1 += numbers1[i];
  		}
  		CLAMP_PROBABILITY(matchfreq1);
  		CLAMP_PROBABILITY(unmatchfreq1);
  		matchfreq2 = unmatchfreq2 = 0.0;
! 		for (i = 0; i < nvalues2; i++)
  		{
  			if (hasmatch2[i])
! 				matchfreq2 += numbers2[i];
  			else
! 				unmatchfreq2 += numbers2[i];
  		}
  		CLAMP_PROBABILITY(matchfreq2);
  		CLAMP_PROBABILITY(unmatchfreq2);
--- 2337,2358 ----
  		CLAMP_PROBABILITY(matchprodfreq);
  		/* Sum up frequencies of matched and unmatched MCVs */
  		matchfreq1 = unmatchfreq1 = 0.0;
! 		for (i = 0; i < sslot1.nvalues; i++)
  		{
  			if (hasmatch1[i])
! 				matchfreq1 += sslot1.numbers[i];
  			else
! 				unmatchfreq1 += sslot1.numbers[i];
  		}
  		CLAMP_PROBABILITY(matchfreq1);
  		CLAMP_PROBABILITY(unmatchfreq1);
  		matchfreq2 = unmatchfreq2 = 0.0;
! 		for (i = 0; i < sslot2.nvalues; i++)
  		{
  			if (hasmatch2[i])
! 				matchfreq2 += sslot2.numbers[i];
  			else
! 				unmatchfreq2 += sslot2.numbers[i];
  		}
  		CLAMP_PROBABILITY(matchfreq2);
  		CLAMP_PROBABILITY(unmatchfreq2);
*************** eqjoinsel_inner(Oid operator,
*** 2425,2439 ****
  		 * MCVs plus non-MCV values.
  		 */
  		totalsel1 = matchprodfreq;
! 		if (nd2 > nvalues2)
! 			totalsel1 += unmatchfreq1 * otherfreq2 / (nd2 - nvalues2);
  		if (nd2 > nmatches)
  			totalsel1 += otherfreq1 * (otherfreq2 + unmatchfreq2) /
  				(nd2 - nmatches);
  		/* Same estimate from the point of view of relation 2. */
  		totalsel2 = matchprodfreq;
! 		if (nd1 > nvalues1)
! 			totalsel2 += unmatchfreq2 * otherfreq1 / (nd1 - nvalues1);
  		if (nd1 > nmatches)
  			totalsel2 += otherfreq2 * (otherfreq1 + unmatchfreq1) /
  				(nd1 - nmatches);
--- 2377,2391 ----
  		 * MCVs plus non-MCV values.
  		 */
  		totalsel1 = matchprodfreq;
! 		if (nd2 > sslot2.nvalues)
! 			totalsel1 += unmatchfreq1 * otherfreq2 / (nd2 - sslot2.nvalues);
  		if (nd2 > nmatches)
  			totalsel1 += otherfreq1 * (otherfreq2 + unmatchfreq2) /
  				(nd2 - nmatches);
  		/* Same estimate from the point of view of relation 2. */
  		totalsel2 = matchprodfreq;
! 		if (nd1 > sslot1.nvalues)
! 			totalsel2 += unmatchfreq2 * otherfreq1 / (nd1 - sslot1.nvalues);
  		if (nd1 > nmatches)
  			totalsel2 += otherfreq2 * (otherfreq1 + unmatchfreq1) /
  				(nd1 - nmatches);
*************** eqjoinsel_inner(Oid operator,
*** 2478,2489 ****
  			selec /= nd2;
  	}
  
! 	if (have_mcvs1)
! 		free_attstatsslot(vardata1->atttype, values1, nvalues1,
! 						  numbers1, nnumbers1);
! 	if (have_mcvs2)
! 		free_attstatsslot(vardata2->atttype, values2, nvalues2,
! 						  numbers2, nnumbers2);
  
  	return selec;
  }
--- 2430,2437 ----
  			selec /= nd2;
  	}
  
! 	free_attstatsslot(&sslot1);
! 	free_attstatsslot(&sslot2);
  
  	return selec;
  }
*************** eqjoinsel_semi(Oid operator,
*** 2508,2528 ****
  	Oid			opfuncoid;
  	Form_pg_statistic stats1 = NULL;
  	bool		have_mcvs1 = false;
- 	Datum	   *values1 = NULL;
- 	int			nvalues1 = 0;
- 	float4	   *numbers1 = NULL;
- 	int			nnumbers1 = 0;
  	bool		have_mcvs2 = false;
! 	Datum	   *values2 = NULL;
! 	int			nvalues2 = 0;
! 	float4	   *numbers2 = NULL;
! 	int			nnumbers2 = 0;
  
  	nd1 = get_variable_numdistinct(vardata1, &isdefault1);
  	nd2 = get_variable_numdistinct(vardata2, &isdefault2);
  
  	opfuncoid = OidIsValid(operator) ? get_opcode(operator) : InvalidOid;
  
  	/*
  	 * We clamp nd2 to be not more than what we estimate the inner relation's
  	 * size to be.  This is intuitively somewhat reasonable since obviously
--- 2456,2473 ----
  	Oid			opfuncoid;
  	Form_pg_statistic stats1 = NULL;
  	bool		have_mcvs1 = false;
  	bool		have_mcvs2 = false;
! 	AttStatsSlot sslot1;
! 	AttStatsSlot sslot2;
  
  	nd1 = get_variable_numdistinct(vardata1, &isdefault1);
  	nd2 = get_variable_numdistinct(vardata2, &isdefault2);
  
  	opfuncoid = OidIsValid(operator) ? get_opcode(operator) : InvalidOid;
  
+ 	memset(&sslot1, 0, sizeof(sslot1));
+ 	memset(&sslot2, 0, sizeof(sslot2));
+ 
  	/*
  	 * We clamp nd2 to be not more than what we estimate the inner relation's
  	 * size to be.  This is intuitively somewhat reasonable since obviously
*************** eqjoinsel_semi(Oid operator,
*** 2561,2587 ****
  		/* note we allow use of nullfrac regardless of security check */
  		stats1 = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		if (statistic_proc_security_check(vardata1, opfuncoid))
! 			have_mcvs1 = get_attstatsslot(vardata1->statsTuple,
! 										  vardata1->atttype,
! 										  vardata1->atttypmod,
! 										  STATISTIC_KIND_MCV,
! 										  InvalidOid,
! 										  NULL,
! 										  &values1, &nvalues1,
! 										  &numbers1, &nnumbers1);
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple) &&
  		statistic_proc_security_check(vardata2, opfuncoid))
  	{
! 		have_mcvs2 = get_attstatsslot(vardata2->statsTuple,
! 									  vardata2->atttype,
! 									  vardata2->atttypmod,
! 									  STATISTIC_KIND_MCV,
! 									  InvalidOid,
! 									  NULL,
! 									  &values2, &nvalues2,
! 									  &numbers2, &nnumbers2);
  	}
  
  	if (have_mcvs1 && have_mcvs2 && OidIsValid(operator))
--- 2506,2523 ----
  		/* note we allow use of nullfrac regardless of security check */
  		stats1 = (Form_pg_statistic) GETSTRUCT(vardata1->statsTuple);
  		if (statistic_proc_security_check(vardata1, opfuncoid))
! 			have_mcvs1 = get_attstatsslot(&sslot1, vardata1->statsTuple,
! 										  STATISTIC_KIND_MCV, InvalidOid,
! 								 ATTSTATSSLOT_VALUES | ATTSTATSSLOT_NUMBERS);
  	}
  
  	if (HeapTupleIsValid(vardata2->statsTuple) &&
  		statistic_proc_security_check(vardata2, opfuncoid))
  	{
! 		have_mcvs2 = get_attstatsslot(&sslot2, vardata2->statsTuple,
! 									  STATISTIC_KIND_MCV, InvalidOid,
! 									  ATTSTATSSLOT_VALUES);
! 		/* note: currently don't need stanumbers from RHS */
  	}
  
  	if (have_mcvs1 && have_mcvs2 && OidIsValid(operator))
*************** eqjoinsel_semi(Oid operator,
*** 2607,2621 ****
  
  		/*
  		 * The clamping above could have resulted in nd2 being less than
! 		 * nvalues2; in which case, we assume that precisely the nd2 most
! 		 * common values in the relation will appear in the join input, and so
! 		 * compare to only the first nd2 members of the MCV list.  Of course
! 		 * this is frequently wrong, but it's the best bet we can make.
  		 */
! 		clamped_nvalues2 = Min(nvalues2, nd2);
  
  		fmgr_info(opfuncoid, &eqproc);
! 		hasmatch1 = (bool *) palloc0(nvalues1 * sizeof(bool));
  		hasmatch2 = (bool *) palloc0(clamped_nvalues2 * sizeof(bool));
  
  		/*
--- 2543,2557 ----
  
  		/*
  		 * The clamping above could have resulted in nd2 being less than
! 		 * sslot2.nvalues; in which case, we assume that precisely the nd2
! 		 * most common values in the relation will appear in the join input,
! 		 * and so compare to only the first nd2 members of the MCV list.  Of
! 		 * course this is frequently wrong, but it's the best bet we can make.
  		 */
! 		clamped_nvalues2 = Min(sslot2.nvalues, nd2);
  
  		fmgr_info(opfuncoid, &eqproc);
! 		hasmatch1 = (bool *) palloc0(sslot1.nvalues * sizeof(bool));
  		hasmatch2 = (bool *) palloc0(clamped_nvalues2 * sizeof(bool));
  
  		/*
*************** eqjoinsel_semi(Oid operator,
*** 2625,2631 ****
  		 * and because the math wouldn't add up...
  		 */
  		nmatches = 0;
! 		for (i = 0; i < nvalues1; i++)
  		{
  			int			j;
  
--- 2561,2567 ----
  		 * and because the math wouldn't add up...
  		 */
  		nmatches = 0;
! 		for (i = 0; i < sslot1.nvalues; i++)
  		{
  			int			j;
  
*************** eqjoinsel_semi(Oid operator,
*** 2635,2642 ****
  					continue;
  				if (DatumGetBool(FunctionCall2Coll(&eqproc,
  												   DEFAULT_COLLATION_OID,
! 												   values1[i],
! 												   values2[j])))
  				{
  					hasmatch1[i] = hasmatch2[j] = true;
  					nmatches++;
--- 2571,2578 ----
  					continue;
  				if (DatumGetBool(FunctionCall2Coll(&eqproc,
  												   DEFAULT_COLLATION_OID,
! 												   sslot1.values[i],
! 												   sslot2.values[j])))
  				{
  					hasmatch1[i] = hasmatch2[j] = true;
  					nmatches++;
*************** eqjoinsel_semi(Oid operator,
*** 2646,2655 ****
  		}
  		/* Sum up frequencies of matched MCVs */
  		matchfreq1 = 0.0;
! 		for (i = 0; i < nvalues1; i++)
  		{
  			if (hasmatch1[i])
! 				matchfreq1 += numbers1[i];
  		}
  		CLAMP_PROBABILITY(matchfreq1);
  		pfree(hasmatch1);
--- 2582,2591 ----
  		}
  		/* Sum up frequencies of matched MCVs */
  		matchfreq1 = 0.0;
! 		for (i = 0; i < sslot1.nvalues; i++)
  		{
  			if (hasmatch1[i])
! 				matchfreq1 += sslot1.numbers[i];
  		}
  		CLAMP_PROBABILITY(matchfreq1);
  		pfree(hasmatch1);
*************** eqjoinsel_semi(Oid operator,
*** 2704,2715 ****
  			selec = 0.5 * (1.0 - nullfrac1);
  	}
  
! 	if (have_mcvs1)
! 		free_attstatsslot(vardata1->atttype, values1, nvalues1,
! 						  numbers1, nnumbers1);
! 	if (have_mcvs2)
! 		free_attstatsslot(vardata2->atttype, values2, nvalues2,
! 						  numbers2, nnumbers2);
  
  	return selec;
  }
--- 2640,2647 ----
  			selec = 0.5 * (1.0 - nullfrac1);
  	}
  
! 	free_attstatsslot(&sslot1);
! 	free_attstatsslot(&sslot2);
  
  	return selec;
  }
*************** estimate_hash_bucketsize(PlannerInfo *ro
*** 3629,3636 ****
  				mcvfreq,
  				avgfreq;
  	bool		isdefault;
! 	float4	   *numbers;
! 	int			nnumbers;
  
  	examine_variable(root, hashkey, 0, &vardata);
  
--- 3561,3567 ----
  				mcvfreq,
  				avgfreq;
  	bool		isdefault;
! 	AttStatsSlot sslot;
  
  	examine_variable(root, hashkey, 0, &vardata);
  
*************** estimate_hash_bucketsize(PlannerInfo *ro
*** 3689,3708 ****
  
  	if (HeapTupleIsValid(vardata.statsTuple))
  	{
! 		if (get_attstatsslot(vardata.statsTuple,
! 							 vardata.atttype, vardata.atttypmod,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 NULL,
! 							 NULL, NULL,
! 							 &numbers, &nnumbers))
  		{
  			/*
  			 * The first MCV stat is for the most common value.
  			 */
! 			if (nnumbers > 0)
! 				mcvfreq = numbers[0];
! 			free_attstatsslot(vardata.atttype, NULL, 0,
! 							  numbers, nnumbers);
  		}
  	}
  
--- 3620,3635 ----
  
  	if (HeapTupleIsValid(vardata.statsTuple))
  	{
! 		if (get_attstatsslot(&sslot, vardata.statsTuple,
  							 STATISTIC_KIND_MCV, InvalidOid,
! 							 ATTSTATSSLOT_NUMBERS))
  		{
  			/*
  			 * The first MCV stat is for the most common value.
  			 */
! 			if (sslot.nnumbers > 0)
! 				mcvfreq = sslot.numbers[0];
! 			free_attstatsslot(&sslot);
  		}
  	}
  
*************** get_join_variables(PlannerInfo *root, Li
*** 4572,4578 ****
   *	freefunc: pointer to a function to release statsTuple with.
   *	vartype: exposed type of the expression; this should always match
   *		the declared input type of the operator we are estimating for.
!  *	atttype, atttypmod: type data to pass to get_attstatsslot().  This is
   *		commonly the same as the exposed type of the variable argument,
   *		but can be different in binary-compatible-type cases.
   *	isunique: TRUE if we were able to match the var to a unique index or a
--- 4499,4505 ----
   *	freefunc: pointer to a function to release statsTuple with.
   *	vartype: exposed type of the expression; this should always match
   *		the declared input type of the operator we are estimating for.
!  *	atttype, atttypmod: actual type/typmod of the "var" expression.  This is
   *		commonly the same as the exposed type of the variable argument,
   *		but can be different in binary-compatible-type cases.
   *	isunique: TRUE if we were able to match the var to a unique index or a
*************** get_variable_range(PlannerInfo *root, Va
*** 5125,5132 ****
  	int16		typLen;
  	bool		typByVal;
  	Oid			opfuncoid;
! 	Datum	   *values;
! 	int			nvalues;
  	int			i;
  
  	/*
--- 5052,5058 ----
  	int16		typLen;
  	bool		typByVal;
  	Oid			opfuncoid;
! 	AttStatsSlot sslot;
  	int			i;
  
  	/*
*************** get_variable_range(PlannerInfo *root, Va
*** 5167,5195 ****
  	 * the one we want, fail --- this suggests that there is data we can't
  	 * use.
  	 */
! 	if (get_attstatsslot(vardata->statsTuple,
! 						 vardata->atttype, vardata->atttypmod,
  						 STATISTIC_KIND_HISTOGRAM, sortop,
! 						 NULL,
! 						 &values, &nvalues,
! 						 NULL, NULL))
  	{
! 		if (nvalues > 0)
  		{
! 			tmin = datumCopy(values[0], typByVal, typLen);
! 			tmax = datumCopy(values[nvalues - 1], typByVal, typLen);
  			have_data = true;
  		}
! 		free_attstatsslot(vardata->atttype, values, nvalues, NULL, 0);
  	}
! 	else if (get_attstatsslot(vardata->statsTuple,
! 							  vardata->atttype, vardata->atttypmod,
  							  STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 							  NULL,
! 							  &values, &nvalues,
! 							  NULL, NULL))
  	{
! 		free_attstatsslot(vardata->atttype, values, nvalues, NULL, 0);
  		return false;
  	}
  
--- 5093,5115 ----
  	 * the one we want, fail --- this suggests that there is data we can't
  	 * use.
  	 */
! 	if (get_attstatsslot(&sslot, vardata->statsTuple,
  						 STATISTIC_KIND_HISTOGRAM, sortop,
! 						 ATTSTATSSLOT_VALUES))
  	{
! 		if (sslot.nvalues > 0)
  		{
! 			tmin = datumCopy(sslot.values[0], typByVal, typLen);
! 			tmax = datumCopy(sslot.values[sslot.nvalues - 1], typByVal, typLen);
  			have_data = true;
  		}
! 		free_attstatsslot(&sslot);
  	}
! 	else if (get_attstatsslot(&sslot, vardata->statsTuple,
  							  STATISTIC_KIND_HISTOGRAM, InvalidOid,
! 							  0))
  	{
! 		free_attstatsslot(&sslot);
  		return false;
  	}
  
*************** get_variable_range(PlannerInfo *root, Va
*** 5199,5210 ****
  	 * the MCVs.  However, usually the MCVs will not be the extreme values, so
  	 * avoid unnecessary data copying.
  	 */
! 	if (get_attstatsslot(vardata->statsTuple,
! 						 vardata->atttype, vardata->atttypmod,
  						 STATISTIC_KIND_MCV, InvalidOid,
! 						 NULL,
! 						 &values, &nvalues,
! 						 NULL, NULL))
  	{
  		bool		tmin_is_mcv = false;
  		bool		tmax_is_mcv = false;
--- 5119,5127 ----
  	 * the MCVs.  However, usually the MCVs will not be the extreme values, so
  	 * avoid unnecessary data copying.
  	 */
! 	if (get_attstatsslot(&sslot, vardata->statsTuple,
  						 STATISTIC_KIND_MCV, InvalidOid,
! 						 ATTSTATSSLOT_VALUES))
  	{
  		bool		tmin_is_mcv = false;
  		bool		tmax_is_mcv = false;
*************** get_variable_range(PlannerInfo *root, Va
*** 5212,5237 ****
  
  		fmgr_info(opfuncoid, &opproc);
  
! 		for (i = 0; i < nvalues; i++)
  		{
  			if (!have_data)
  			{
! 				tmin = tmax = values[i];
  				tmin_is_mcv = tmax_is_mcv = have_data = true;
  				continue;
  			}
  			if (DatumGetBool(FunctionCall2Coll(&opproc,
  											   DEFAULT_COLLATION_OID,
! 											   values[i], tmin)))
  			{
! 				tmin = values[i];
  				tmin_is_mcv = true;
  			}
  			if (DatumGetBool(FunctionCall2Coll(&opproc,
  											   DEFAULT_COLLATION_OID,
! 											   tmax, values[i])))
  			{
! 				tmax = values[i];
  				tmax_is_mcv = true;
  			}
  		}
--- 5129,5154 ----
  
  		fmgr_info(opfuncoid, &opproc);
  
! 		for (i = 0; i < sslot.nvalues; i++)
  		{
  			if (!have_data)
  			{
! 				tmin = tmax = sslot.values[i];
  				tmin_is_mcv = tmax_is_mcv = have_data = true;
  				continue;
  			}
  			if (DatumGetBool(FunctionCall2Coll(&opproc,
  											   DEFAULT_COLLATION_OID,
! 											   sslot.values[i], tmin)))
  			{
! 				tmin = sslot.values[i];
  				tmin_is_mcv = true;
  			}
  			if (DatumGetBool(FunctionCall2Coll(&opproc,
  											   DEFAULT_COLLATION_OID,
! 											   tmax, sslot.values[i])))
  			{
! 				tmax = sslot.values[i];
  				tmax_is_mcv = true;
  			}
  		}
*************** get_variable_range(PlannerInfo *root, Va
*** 5239,5245 ****
  			tmin = datumCopy(tmin, typByVal, typLen);
  		if (tmax_is_mcv)
  			tmax = datumCopy(tmax, typByVal, typLen);
! 		free_attstatsslot(vardata->atttype, values, nvalues, NULL, 0);
  	}
  
  	*min = tmin;
--- 5156,5162 ----
  			tmin = datumCopy(tmin, typByVal, typLen);
  		if (tmax_is_mcv)
  			tmax = datumCopy(tmax, typByVal, typLen);
! 		free_attstatsslot(&sslot);
  	}
  
  	*min = tmin;
*************** btcostestimate(PlannerInfo *root, IndexP
*** 6979,7003 ****
  	if (HeapTupleIsValid(vardata.statsTuple))
  	{
  		Oid			sortop;
! 		float4	   *numbers;
! 		int			nnumbers;
  
  		sortop = get_opfamily_member(index->opfamily[0],
  									 index->opcintype[0],
  									 index->opcintype[0],
  									 BTLessStrategyNumber);
  		if (OidIsValid(sortop) &&
! 			get_attstatsslot(vardata.statsTuple, InvalidOid, 0,
! 							 STATISTIC_KIND_CORRELATION,
! 							 sortop,
! 							 NULL,
! 							 NULL, NULL,
! 							 &numbers, &nnumbers))
  		{
  			double		varCorrelation;
  
! 			Assert(nnumbers == 1);
! 			varCorrelation = numbers[0];
  
  			if (index->reverse_sort[0])
  				varCorrelation = -varCorrelation;
--- 6896,6916 ----
  	if (HeapTupleIsValid(vardata.statsTuple))
  	{
  		Oid			sortop;
! 		AttStatsSlot sslot;
  
  		sortop = get_opfamily_member(index->opfamily[0],
  									 index->opcintype[0],
  									 index->opcintype[0],
  									 BTLessStrategyNumber);
  		if (OidIsValid(sortop) &&
! 			get_attstatsslot(&sslot, vardata.statsTuple,
! 							 STATISTIC_KIND_CORRELATION, sortop,
! 							 ATTSTATSSLOT_NUMBERS))
  		{
  			double		varCorrelation;
  
! 			Assert(sslot.nnumbers == 1);
! 			varCorrelation = sslot.numbers[0];
  
  			if (index->reverse_sort[0])
  				varCorrelation = -varCorrelation;
*************** btcostestimate(PlannerInfo *root, IndexP
*** 7007,7013 ****
  			else
  				costs.indexCorrelation = varCorrelation;
  
! 			free_attstatsslot(InvalidOid, NULL, 0, numbers, nnumbers);
  		}
  	}
  
--- 6920,6926 ----
  			else
  				costs.indexCorrelation = varCorrelation;
  
! 			free_attstatsslot(&sslot);
  		}
  	}
  
*************** brincostestimate(PlannerInfo *root, Inde
*** 7920,7944 ****
  
  		if (HeapTupleIsValid(vardata.statsTuple))
  		{
! 			float4	   *numbers;
! 			int			nnumbers;
  
! 			if (get_attstatsslot(vardata.statsTuple, InvalidOid, 0,
! 								 STATISTIC_KIND_CORRELATION,
! 								 InvalidOid,
! 								 NULL,
! 								 NULL, NULL,
! 								 &numbers, &nnumbers))
  			{
  				double		varCorrelation = 0.0;
  
! 				if (nnumbers > 0)
! 					varCorrelation = Abs(numbers[0]);
  
  				if (varCorrelation > *indexCorrelation)
  					*indexCorrelation = varCorrelation;
  
! 				free_attstatsslot(InvalidOid, NULL, 0, numbers, nnumbers);
  			}
  		}
  
--- 7833,7853 ----
  
  		if (HeapTupleIsValid(vardata.statsTuple))
  		{
! 			AttStatsSlot sslot;
  
! 			if (get_attstatsslot(&sslot, vardata.statsTuple,
! 								 STATISTIC_KIND_CORRELATION, InvalidOid,
! 								 ATTSTATSSLOT_NUMBERS))
  			{
  				double		varCorrelation = 0.0;
  
! 				if (sslot.nnumbers > 0)
! 					varCorrelation = Abs(sslot.numbers[0]);
  
  				if (varCorrelation > *indexCorrelation)
  					*indexCorrelation = varCorrelation;
  
! 				free_attstatsslot(&sslot);
  			}
  		}
  
diff --git a/src/backend/utils/cache/lsyscache.c b/src/backend/utils/cache/lsyscache.c
index 236d876..b94d475 100644
*** a/src/backend/utils/cache/lsyscache.c
--- b/src/backend/utils/cache/lsyscache.c
*************** get_attavgwidth(Oid relid, AttrNumber at
*** 2864,2898 ****
   * that have been provided by a stats hook and didn't really come from
   * pg_statistic.
   *
   * statstuple: pg_statistic tuple to be examined.
-  * atttype: type OID of slot's stavalues (can be InvalidOid if values == NULL).
-  * atttypmod: typmod of slot's stavalues (can be 0 if values == NULL).
   * reqkind: STAKIND code for desired statistics slot kind.
   * reqop: STAOP value wanted, or InvalidOid if don't care.
!  * actualop: if not NULL, *actualop receives the actual STAOP value.
!  * values, nvalues: if not NULL, the slot's stavalues are extracted.
!  * numbers, nnumbers: if not NULL, the slot's stanumbers are extracted.
   *
!  * If assigned, values and numbers are set to point to palloc'd arrays.
!  * If the stavalues datatype is pass-by-reference, the values referenced by
!  * the values array are themselves palloc'd.  The palloc'd stuff can be
!  * freed by calling free_attstatsslot.
   *
!  * Note: at present, atttype/atttypmod aren't actually used here at all.
!  * But the caller must have the correct (or at least binary-compatible)
!  * type ID to pass to free_attstatsslot later.
   */
  bool
! get_attstatsslot(HeapTuple statstuple,
! 				 Oid atttype, int32 atttypmod,
! 				 int reqkind, Oid reqop,
! 				 Oid *actualop,
! 				 Datum **values, int *nvalues,
! 				 float4 **numbers, int *nnumbers)
  {
  	Form_pg_statistic stats = (Form_pg_statistic) GETSTRUCT(statstuple);
! 	int			i,
! 				j;
  	Datum		val;
  	bool		isnull;
  	ArrayType  *statarray;
--- 2864,2902 ----
   * that have been provided by a stats hook and didn't really come from
   * pg_statistic.
   *
+  * sslot: pointer to output area (typically, a local variable in the caller).
   * statstuple: pg_statistic tuple to be examined.
   * reqkind: STAKIND code for desired statistics slot kind.
   * reqop: STAOP value wanted, or InvalidOid if don't care.
!  * flags: bitmask of ATTSTATSSLOT_VALUES and/or ATTSTATSSLOT_NUMBERS.
   *
!  * If a matching slot is found, TRUE is returned, and *sslot is filled thus:
!  * staop: receives the actual STAOP value.
!  * valuetype: receives actual datatype of the elements of stavalues.
!  * values: receives pointer to an array of the slot's stavalues.
!  * nvalues: receives number of stavalues.
!  * numbers: receives pointer to an array of the slot's stanumbers (as float4).
!  * nnumbers: receives number of stanumbers.
   *
!  * valuetype/values/nvalues are InvalidOid/NULL/0 if ATTSTATSSLOT_VALUES
!  * wasn't specified.  Likewise, numbers/nnumbers are NULL/0 if
!  * ATTSTATSSLOT_NUMBERS wasn't specified.
!  *
!  * If no matching slot is found, FALSE is returned, and *sslot is zeroed.
!  *
!  * The data referred to by the fields of sslot is locally palloc'd and
!  * is independent of the original pg_statistic tuple.  When the caller
!  * is done with it, call free_attstatsslot to release the palloc'd data.
!  *
!  * If it's desirable to call free_attstatsslot when get_attstatsslot might
!  * not have been called, memset'ing sslot to zeroes will allow that.
   */
  bool
! get_attstatsslot(AttStatsSlot *sslot, HeapTuple statstuple,
! 				 int reqkind, Oid reqop, int flags)
  {
  	Form_pg_statistic stats = (Form_pg_statistic) GETSTRUCT(statstuple);
! 	int			i;
  	Datum		val;
  	bool		isnull;
  	ArrayType  *statarray;
*************** get_attstatsslot(HeapTuple statstuple,
*** 2901,2906 ****
--- 2905,2913 ----
  	HeapTuple	typeTuple;
  	Form_pg_type typeForm;
  
+ 	/* initialize *sslot properly */
+ 	memset(sslot, 0, sizeof(AttStatsSlot));
+ 
  	for (i = 0; i < STATISTIC_NUM_SLOTS; i++)
  	{
  		if ((&stats->stakind1)[i] == reqkind &&
*************** get_attstatsslot(HeapTuple statstuple,
*** 2910,2935 ****
  	if (i >= STATISTIC_NUM_SLOTS)
  		return false;			/* not there */
  
! 	if (actualop)
! 		*actualop = (&stats->staop1)[i];
  
! 	if (values)
  	{
  		val = SysCacheGetAttr(STATRELATTINH, statstuple,
  							  Anum_pg_statistic_stavalues1 + i,
  							  &isnull);
  		if (isnull)
  			elog(ERROR, "stavalues is null");
- 		statarray = DatumGetArrayTypeP(val);
  
  		/*
! 		 * Need to get info about the array element type.  We look at the
! 		 * actual element type embedded in the array, which might be only
! 		 * binary-compatible with the passed-in atttype.  The info we extract
! 		 * here should be the same either way, but deconstruct_array is picky
! 		 * about having an exact type OID match.
  		 */
! 		arrayelemtype = ARR_ELEMTYPE(statarray);
  		typeTuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(arrayelemtype));
  		if (!HeapTupleIsValid(typeTuple))
  			elog(ERROR, "cache lookup failed for type %u", arrayelemtype);
--- 2917,2945 ----
  	if (i >= STATISTIC_NUM_SLOTS)
  		return false;			/* not there */
  
! 	sslot->staop = (&stats->staop1)[i];
  
! 	if (flags & ATTSTATSSLOT_VALUES)
  	{
  		val = SysCacheGetAttr(STATRELATTINH, statstuple,
  							  Anum_pg_statistic_stavalues1 + i,
  							  &isnull);
  		if (isnull)
  			elog(ERROR, "stavalues is null");
  
  		/*
! 		 * Detoast the array if needed, and in any case make a copy that's
! 		 * under control of this AttStatsSlot.
  		 */
! 		statarray = DatumGetArrayTypePCopy(val);
! 
! 		/*
! 		 * Extract the actual array element type, and pass it back in case the
! 		 * caller needs it.
! 		 */
! 		sslot->valuetype = arrayelemtype = ARR_ELEMTYPE(statarray);
! 
! 		/* Need info about element type */
  		typeTuple = SearchSysCache1(TYPEOID, ObjectIdGetDatum(arrayelemtype));
  		if (!HeapTupleIsValid(typeTuple))
  			elog(ERROR, "cache lookup failed for type %u", arrayelemtype);
*************** get_attstatsslot(HeapTuple statstuple,
*** 2941,2980 ****
  						  typeForm->typlen,
  						  typeForm->typbyval,
  						  typeForm->typalign,
! 						  values, NULL, nvalues);
  
  		/*
  		 * If the element type is pass-by-reference, we now have a bunch of
! 		 * Datums that are pointers into the syscache value.  Copy them to
! 		 * avoid problems if syscache decides to drop the entry.
  		 */
  		if (!typeForm->typbyval)
! 		{
! 			for (j = 0; j < *nvalues; j++)
! 			{
! 				(*values)[j] = datumCopy((*values)[j],
! 										 typeForm->typbyval,
! 										 typeForm->typlen);
! 			}
! 		}
  
  		ReleaseSysCache(typeTuple);
- 
- 		/*
- 		 * Free statarray if it's a detoasted copy.
- 		 */
- 		if ((Pointer) statarray != DatumGetPointer(val))
- 			pfree(statarray);
  	}
  
! 	if (numbers)
  	{
  		val = SysCacheGetAttr(STATRELATTINH, statstuple,
  							  Anum_pg_statistic_stanumbers1 + i,
  							  &isnull);
  		if (isnull)
  			elog(ERROR, "stanumbers is null");
! 		statarray = DatumGetArrayTypeP(val);
  
  		/*
  		 * We expect the array to be a 1-D float4 array; verify that. We don't
--- 2951,2985 ----
  						  typeForm->typlen,
  						  typeForm->typbyval,
  						  typeForm->typalign,
! 						  &sslot->values, NULL, &sslot->nvalues);
  
  		/*
  		 * If the element type is pass-by-reference, we now have a bunch of
! 		 * Datums that are pointers into the statarray, so we need to keep
! 		 * that until free_attstatsslot.  Otherwise, all the useful info is in
! 		 * sslot->values[], so we can free the array object immediately.
  		 */
  		if (!typeForm->typbyval)
! 			sslot->values_arr = statarray;
! 		else
! 			pfree(statarray);
  
  		ReleaseSysCache(typeTuple);
  	}
  
! 	if (flags & ATTSTATSSLOT_NUMBERS)
  	{
  		val = SysCacheGetAttr(STATRELATTINH, statstuple,
  							  Anum_pg_statistic_stanumbers1 + i,
  							  &isnull);
  		if (isnull)
  			elog(ERROR, "stanumbers is null");
! 
! 		/*
! 		 * Detoast the array if needed, and in any case make a copy that's
! 		 * under control of this AttStatsSlot.
! 		 */
! 		statarray = DatumGetArrayTypePCopy(val);
  
  		/*
  		 * We expect the array to be a 1-D float4 array; verify that. We don't
*************** get_attstatsslot(HeapTuple statstuple,
*** 2986,3000 ****
  			ARR_HASNULL(statarray) ||
  			ARR_ELEMTYPE(statarray) != FLOAT4OID)
  			elog(ERROR, "stanumbers is not a 1-D float4 array");
- 		*numbers = (float4 *) palloc(narrayelem * sizeof(float4));
- 		memcpy(*numbers, ARR_DATA_PTR(statarray), narrayelem * sizeof(float4));
- 		*nnumbers = narrayelem;
  
! 		/*
! 		 * Free statarray if it's a detoasted copy.
! 		 */
! 		if ((Pointer) statarray != DatumGetPointer(val))
! 			pfree(statarray);
  	}
  
  	return true;
--- 2991,3003 ----
  			ARR_HASNULL(statarray) ||
  			ARR_ELEMTYPE(statarray) != FLOAT4OID)
  			elog(ERROR, "stanumbers is not a 1-D float4 array");
  
! 		/* Give caller a pointer directly into the statarray */
! 		sslot->numbers = (float4 *) ARR_DATA_PTR(statarray);
! 		sslot->nnumbers = narrayelem;
! 
! 		/* We'll free the statarray in free_attstatsslot */
! 		sslot->numbers_arr = statarray;
  	}
  
  	return true;
*************** get_attstatsslot(HeapTuple statstuple,
*** 3003,3030 ****
  /*
   * free_attstatsslot
   *		Free data allocated by get_attstatsslot
-  *
-  * atttype is the type of the individual values in values[].
-  * It need be valid only if values != NULL.
   */
  void
! free_attstatsslot(Oid atttype,
! 				  Datum *values, int nvalues,
! 				  float4 *numbers, int nnumbers)
  {
! 	if (values)
! 	{
! 		if (!get_typbyval(atttype))
! 		{
! 			int			i;
! 
! 			for (i = 0; i < nvalues; i++)
! 				pfree(DatumGetPointer(values[i]));
! 		}
! 		pfree(values);
! 	}
! 	if (numbers)
! 		pfree(numbers);
  }
  
  /*				---------- PG_NAMESPACE CACHE ----------				 */
--- 3006,3024 ----
  /*
   * free_attstatsslot
   *		Free data allocated by get_attstatsslot
   */
  void
! free_attstatsslot(AttStatsSlot *sslot)
  {
! 	/* The values[] array was separately palloc'd by deconstruct_array */
! 	if (sslot->values)
! 		pfree(sslot->values);
! 	/* The numbers[] array points into numbers_arr, do not pfree it */
! 	/* Free the detoasted array objects, if any */
! 	if (sslot->values_arr)
! 		pfree(sslot->values_arr);
! 	if (sslot->numbers_arr)
! 		pfree(sslot->numbers_arr);
  }
  
  /*				---------- PG_NAMESPACE CACHE ----------				 */
diff --git a/src/include/utils/lsyscache.h b/src/include/utils/lsyscache.h
index 88629d9..a0d90e7 100644
*** a/src/include/utils/lsyscache.h
--- b/src/include/utils/lsyscache.h
*************** typedef enum IOFuncSelector
*** 35,40 ****
--- 35,62 ----
  	IOFunc_send
  } IOFuncSelector;
  
+ /* Flag bits for get_attstatsslot */
+ #define ATTSTATSSLOT_VALUES		0x01
+ #define ATTSTATSSLOT_NUMBERS	0x02
+ 
+ /* Result struct for get_attstatsslot */
+ typedef struct AttStatsSlot
+ {
+ 	/* Always filled: */
+ 	Oid			staop;			/* Actual staop for the found slot */
+ 	/* Filled if ATTSTATSSLOT_VALUES is specified: */
+ 	Oid			valuetype;		/* Actual datatype of the values */
+ 	Datum	   *values;			/* slot's "values" array, or NULL if none */
+ 	int			nvalues;		/* length of values[], or 0 */
+ 	/* Filled if ATTSTATSSLOT_NUMBERS is specified: */
+ 	float4	   *numbers;		/* slot's "numbers" array, or NULL if none */
+ 	int			nnumbers;		/* length of numbers[], or 0 */
+ 
+ 	/* Remaining fields are private to get_attstatsslot/free_attstatsslot */
+ 	void	   *values_arr;		/* palloc'd values array, if any */
+ 	void	   *numbers_arr;	/* palloc'd numbers array, if any */
+ } AttStatsSlot;
+ 
  /* Hook for plugins to get control in get_attavgwidth() */
  typedef int32 (*get_attavgwidth_hook_type) (Oid relid, AttrNumber attnum);
  extern PGDLLIMPORT get_attavgwidth_hook_type get_attavgwidth_hook;
*************** extern Oid	getBaseType(Oid typid);
*** 148,162 ****
  extern Oid	getBaseTypeAndTypmod(Oid typid, int32 *typmod);
  extern int32 get_typavgwidth(Oid typid, int32 typmod);
  extern int32 get_attavgwidth(Oid relid, AttrNumber attnum);
! extern bool get_attstatsslot(HeapTuple statstuple,
! 				 Oid atttype, int32 atttypmod,
! 				 int reqkind, Oid reqop,
! 				 Oid *actualop,
! 				 Datum **values, int *nvalues,
! 				 float4 **numbers, int *nnumbers);
! extern void free_attstatsslot(Oid atttype,
! 				  Datum *values, int nvalues,
! 				  float4 *numbers, int nnumbers);
  extern char *get_namespace_name(Oid nspid);
  extern char *get_namespace_name_or_temp(Oid nspid);
  extern Oid	get_range_subtype(Oid rangeOid);
--- 170,178 ----
  extern Oid	getBaseTypeAndTypmod(Oid typid, int32 *typmod);
  extern int32 get_typavgwidth(Oid typid, int32 typmod);
  extern int32 get_attavgwidth(Oid relid, AttrNumber attnum);
! extern bool get_attstatsslot(AttStatsSlot *sslot, HeapTuple statstuple,
! 				 int reqkind, Oid reqop, int flags);
! extern void free_attstatsslot(AttStatsSlot *sslot);
  extern char *get_namespace_name(Oid nspid);
  extern char *get_namespace_name_or_temp(Oid nspid);
  extern Oid	get_range_subtype(Oid rangeOid);
diff --git a/src/include/utils/selfuncs.h b/src/include/utils/selfuncs.h
index b7617dd..958bdba 100644
*** a/src/include/utils/selfuncs.h
--- b/src/include/utils/selfuncs.h
*************** typedef struct VariableStatData
*** 72,79 ****
  	/* NB: if statsTuple!=NULL, it must be freed when caller is done */
  	void		(*freefunc) (HeapTuple tuple);	/* how to free statsTuple */
  	Oid			vartype;		/* exposed type of expression */
! 	Oid			atttype;		/* type to pass to get_attstatsslot */
! 	int32		atttypmod;		/* typmod to pass to get_attstatsslot */
  	bool		isunique;		/* matches unique index or DISTINCT clause */
  	bool		acl_ok;			/* result of ACL check on table or column */
  } VariableStatData;
--- 72,79 ----
  	/* NB: if statsTuple!=NULL, it must be freed when caller is done */
  	void		(*freefunc) (HeapTuple tuple);	/* how to free statsTuple */
  	Oid			vartype;		/* exposed type of expression */
! 	Oid			atttype;		/* actual type (after stripping relabel) */
! 	int32		atttypmod;		/* actual typmod (after stripping relabel) */
  	bool		isunique;		/* matches unique index or DISTINCT clause */
  	bool		acl_ok;			/* result of ACL check on table or column */
  } VariableStatData;
