diff --git a/src/backend/utils/adt/Makefile b/src/backend/utils/adt/Makefile
index 5f0b254..b263d88 100644
--- a/src/backend/utils/adt/Makefile
+++ b/src/backend/utils/adt/Makefile
@@ -16,7 +16,7 @@ OBJS = acl.o amutils.o arrayfuncs.o array_expanded.o array_selfuncs.o \
 	float.o format_type.o formatting.o genfile.o \
 	geo_ops.o geo_selfuncs.o geo_spgist.o inet_cidr_ntop.o inet_net_pton.o \
 	int.o int8.o json.o jsonb.o jsonb_gin.o jsonb_op.o jsonb_util.o \
-	jsonfuncs.o jsonpath_gram.o jsonpath_scan.o jsonpath.o jsonpath_exec.o \
+	jsonfuncs.o jsonpath_gram.o jsonpath_scan.o jsonpath.o jsonpath_exec.o jsonpath_json.o \
 	like.o lockfuncs.o mac.o mac8.o misc.o nabstime.o name.o \
 	network.o network_gist.o network_selfuncs.o network_spgist.o \
 	numeric.o numutils.o oid.o oracle_compat.o \
@@ -46,6 +46,8 @@ jsonpath_gram.h: jsonpath_gram.c ;
 # Force these dependencies to be known even without dependency info built:
 jsonpath_gram.o jsonpath_scan.o jsonpath_parser.o: jsonpath_gram.h
 
+jsonpath_json.o: jsonpath_exec.c
+
 # jsonpath_gram.c, jsonpath_gram.h, and jsonpath_scan.c are in the distribution
 # tarball, so they are not cleaned here.
 clean distclean maintainer-clean:
diff --git a/src/backend/utils/adt/json.c b/src/backend/utils/adt/json.c
index 10ac37c..e130987 100644
--- a/src/backend/utils/adt/json.c
+++ b/src/backend/utils/adt/json.c
@@ -106,6 +106,9 @@ static void add_json(Datum val, bool is_null, StringInfo result,
 		 Oid val_type, bool key_scalar);
 static text *catenate_stringinfo_string(StringInfo buffer, const char *addon);
 
+static JsonIterator *JsonIteratorInitFromLex(JsonContainer *jc,
+						JsonLexContext *lex, JsonIterator *parent);
+
 /* the null action object used for pure validation */
 static JsonSemAction nullSemAction =
 {
@@ -126,6 +129,22 @@ lex_peek(JsonLexContext *lex)
 	return lex->token_type;
 }
 
+static inline char *
+lex_peek_value(JsonLexContext *lex)
+{
+	if (lex->token_type == JSON_TOKEN_STRING)
+		return lex->strval ? pstrdup(lex->strval->data) : NULL;
+	else
+	{
+		int			len = (lex->token_terminator - lex->token_start);
+		char	   *tokstr = palloc(len + 1);
+
+		memcpy(tokstr, lex->token_start, len);
+		tokstr[len] = '\0';
+		return tokstr;
+	}
+}
+
 /*
  * lex_accept
  *
@@ -141,22 +160,8 @@ lex_accept(JsonLexContext *lex, JsonTokenType token, char **lexeme)
 	if (lex->token_type == token)
 	{
 		if (lexeme != NULL)
-		{
-			if (lex->token_type == JSON_TOKEN_STRING)
-			{
-				if (lex->strval != NULL)
-					*lexeme = pstrdup(lex->strval->data);
-			}
-			else
-			{
-				int			len = (lex->token_terminator - lex->token_start);
-				char	   *tokstr = palloc(len + 1);
+			*lexeme = lex_peek_value(lex);
 
-				memcpy(tokstr, lex->token_start, len);
-				tokstr[len] = '\0';
-				*lexeme = tokstr;
-			}
-		}
 		json_lex(lex);
 		return true;
 	}
@@ -2553,3 +2558,803 @@ json_typeof(PG_FUNCTION_ARGS)
 
 	PG_RETURN_TEXT_P(cstring_to_text(type));
 }
+
+static void
+jsonInitContainer(JsonContainerData *jc, char *json, int len, int type,
+				  int size)
+{
+	if (size < 0 || size > JB_CMASK)
+		size = JB_CMASK;	/* unknown size */
+
+	jc->data = json;
+	jc->len = len;
+	jc->header = type | size;
+}
+
+/*
+ * Initialize a JsonContainer from a text datum.
+ */
+static void
+jsonInit(JsonContainerData *jc, Datum value)
+{
+	text	   *json = DatumGetTextP(value);
+	JsonLexContext *lex = makeJsonLexContext(json, false);
+	JsonTokenType tok;
+	int			type;
+	int			size = -1;
+
+	/* Lex exactly one token from the input and check its type. */
+	json_lex(lex);
+	tok = lex_peek(lex);
+
+	switch (tok)
+	{
+		case JSON_TOKEN_OBJECT_START:
+			type = JB_FOBJECT;
+			lex_accept(lex, tok, NULL);
+			if (lex_peek(lex) == JSON_TOKEN_OBJECT_END)
+				size = 0;
+			break;
+		case JSON_TOKEN_ARRAY_START:
+			type = JB_FARRAY;
+			lex_accept(lex, tok, NULL);
+			if (lex_peek(lex) == JSON_TOKEN_ARRAY_END)
+				size = 0;
+			break;
+		case JSON_TOKEN_STRING:
+		case JSON_TOKEN_NUMBER:
+		case JSON_TOKEN_TRUE:
+		case JSON_TOKEN_FALSE:
+		case JSON_TOKEN_NULL:
+			type = JB_FARRAY | JB_FSCALAR;
+			size = 1;
+			break;
+		default:
+			elog(ERROR, "unexpected json token: %d", tok);
+			type = jbvNull;
+			break;
+	}
+
+	pfree(lex);
+
+	jsonInitContainer(jc, VARDATA(json), VARSIZE(json) - VARHDRSZ, type, size);
+}
+
+/*
+ * Wrap JSON text into a palloc()'d Json structure.
+ */
+Json *
+JsonCreate(text *json)
+{
+	Json	   *res = palloc0(sizeof(*res));
+
+	jsonInit((JsonContainerData *) &res->root, PointerGetDatum(json));
+
+	return res;
+}
+
+static bool
+jsonFillValue(JsonIterator **pit, JsonbValue *res, bool skipNested,
+			  JsontIterState nextState)
+{
+	JsonIterator *it = *pit;
+	JsonLexContext *lex = it->lex;
+	JsonTokenType tok = lex_peek(lex);
+
+	switch (tok)
+	{
+		case JSON_TOKEN_NULL:
+			res->type = jbvNull;
+			break;
+
+		case JSON_TOKEN_TRUE:
+			res->type = jbvBool;
+			res->val.boolean = true;
+			break;
+
+		case JSON_TOKEN_FALSE:
+			res->type = jbvBool;
+			res->val.boolean = false;
+			break;
+
+		case JSON_TOKEN_STRING:
+		{
+			char	   *token = lex_peek_value(lex);
+			res->type = jbvString;
+			res->val.string.val = token;
+			res->val.string.len = strlen(token);
+			break;
+		}
+
+		case JSON_TOKEN_NUMBER:
+		{
+			char	   *token = lex_peek_value(lex);
+			res->type = jbvNumeric;
+			res->val.numeric = DatumGetNumeric(DirectFunctionCall3(
+					numeric_in, CStringGetDatum(token), 0, -1));
+			break;
+		}
+
+		case JSON_TOKEN_OBJECT_START:
+		case JSON_TOKEN_ARRAY_START:
+		{
+			JsonContainerData *cont = palloc(sizeof(*cont));
+			char	   *token_start = lex->token_start;
+			int			len;
+
+			if (skipNested)
+			{
+				/* find the end of a container for its length calculation */
+				if (tok == JSON_TOKEN_OBJECT_START)
+					parse_object(lex, &nullSemAction);
+				else
+					parse_array(lex, &nullSemAction);
+
+				len = lex->token_start - token_start;
+			}
+			else
+				len = lex->input_length - (lex->token_start - lex->input);
+
+			jsonInitContainer(cont,
+							  token_start, len,
+							  tok == JSON_TOKEN_OBJECT_START ?
+									JB_FOBJECT : JB_FARRAY,
+							  -1);
+
+			res->type = jbvBinary;
+			res->val.binary.data = (JsonbContainer *) cont;
+			res->val.binary.len = len;
+
+			if (skipNested)
+				return false;
+
+			/* recurse into container */
+			it->state = nextState;
+			*pit = JsonIteratorInitFromLex(cont, lex, *pit);
+			return true;
+		}
+
+		default:
+			report_parse_error(JSON_PARSE_VALUE, lex);
+	}
+
+	lex_accept(lex, tok, NULL);
+
+	return false;
+}
+
+static inline JsonIterator *
+JsonIteratorFreeAndGetParent(JsonIterator *it)
+{
+	JsonIterator *parent = it->parent;
+
+	pfree(it);
+
+	return parent;
+}
+
+/*
+ * Free a whole stack of JsonIterator iterators.
+ */
+void
+JsonIteratorFree(JsonIterator *it)
+{
+	while (it)
+		it = JsonIteratorFreeAndGetParent(it);
+}
+
+/*
+ * Get next JsonbValue while iterating through JsonContainer.
+ *
+ * For more details, see JsonbIteratorNext().
+ */
+JsonbIteratorToken
+JsonIteratorNext(JsonIterator **pit, JsonbValue *val, bool skipNested)
+{
+	JsonIterator *it;
+
+	if (*pit == NULL)
+		return WJB_DONE;
+
+recurse:
+	it = *pit;
+
+	/* parse by recursive descent */
+	switch (it->state)
+	{
+		case JTI_ARRAY_START:
+			val->type = jbvArray;
+			val->val.array.nElems = it->isScalar ? 1 : -1;
+			val->val.array.rawScalar = it->isScalar;
+			val->val.array.elems = NULL;
+			it->state = it->isScalar ? JTI_ARRAY_ELEM_SCALAR : JTI_ARRAY_ELEM;
+			return WJB_BEGIN_ARRAY;
+
+		case JTI_ARRAY_ELEM_SCALAR:
+		{
+			(void) jsonFillValue(pit, val, skipNested, JTI_ARRAY_END);
+			it->state = JTI_ARRAY_END;
+			return WJB_ELEM;
+		}
+
+		case JTI_ARRAY_END:
+			if (!it->parent && lex_peek(it->lex) != JSON_TOKEN_END)
+				report_parse_error(JSON_PARSE_END, it->lex);
+			*pit = JsonIteratorFreeAndGetParent(*pit);
+			return WJB_END_ARRAY;
+
+		case JTI_ARRAY_ELEM:
+			if (lex_accept(it->lex, JSON_TOKEN_ARRAY_END, NULL))
+			{
+				it->state = JTI_ARRAY_END;
+				goto recurse;
+			}
+
+			if (jsonFillValue(pit, val, skipNested, JTI_ARRAY_ELEM_AFTER))
+				goto recurse;
+
+			/* fall through */
+
+		case JTI_ARRAY_ELEM_AFTER:
+			if (!lex_accept(it->lex, JSON_TOKEN_COMMA, NULL))
+			{
+				if (lex_peek(it->lex) != JSON_TOKEN_ARRAY_END)
+					report_parse_error(JSON_PARSE_ARRAY_NEXT, it->lex);
+			}
+
+			if (it->state == JTI_ARRAY_ELEM_AFTER)
+			{
+				it->state = JTI_ARRAY_ELEM;
+				goto recurse;
+			}
+
+			return WJB_ELEM;
+
+		case JTI_OBJECT_START:
+			val->type = jbvObject;
+			val->val.object.nPairs = -1;
+			val->val.object.pairs = NULL;
+			val->val.object.uniquified = false;
+			it->state = JTI_OBJECT_KEY;
+			return WJB_BEGIN_OBJECT;
+
+		case JTI_OBJECT_KEY:
+			if (lex_accept(it->lex, JSON_TOKEN_OBJECT_END, NULL))
+			{
+				if (!it->parent && lex_peek(it->lex) != JSON_TOKEN_END)
+					report_parse_error(JSON_PARSE_END, it->lex);
+				*pit = JsonIteratorFreeAndGetParent(*pit);
+				return WJB_END_OBJECT;
+			}
+
+			if (lex_peek(it->lex) != JSON_TOKEN_STRING)
+				report_parse_error(JSON_PARSE_OBJECT_START, it->lex);
+
+			(void) jsonFillValue(pit, val, true, JTI_OBJECT_VALUE);
+
+			if (!lex_accept(it->lex, JSON_TOKEN_COLON, NULL))
+				report_parse_error(JSON_PARSE_OBJECT_LABEL, it->lex);
+
+			it->state = JTI_OBJECT_VALUE;
+			return WJB_KEY;
+
+		case JTI_OBJECT_VALUE:
+			if (jsonFillValue(pit, val, skipNested, JTI_OBJECT_VALUE_AFTER))
+				goto recurse;
+
+			/* fall through */
+
+		case JTI_OBJECT_VALUE_AFTER:
+			if (!lex_accept(it->lex, JSON_TOKEN_COMMA, NULL))
+			{
+				if (lex_peek(it->lex) != JSON_TOKEN_OBJECT_END)
+					report_parse_error(JSON_PARSE_OBJECT_NEXT, it->lex);
+			}
+
+			if (it->state == JTI_OBJECT_VALUE_AFTER)
+			{
+				it->state = JTI_OBJECT_KEY;
+				goto recurse;
+			}
+
+			it->state = JTI_OBJECT_KEY;
+			return WJB_VALUE;
+
+		default:
+			break;
+	}
+
+	return WJB_DONE;
+}
+
+static JsonIterator *
+JsonIteratorInitFromLex(JsonContainer *jc, JsonLexContext *lex,
+						JsonIterator *parent)
+{
+	JsonIterator *it = palloc(sizeof(JsonIterator));
+	JsonTokenType tok;
+
+	it->container = jc;
+	it->parent = parent;
+	it->lex = lex;
+
+	tok = lex_peek(it->lex);
+
+	switch (tok)
+	{
+		case JSON_TOKEN_OBJECT_START:
+			it->isScalar = false;
+			it->state = JTI_OBJECT_START;
+			lex_accept(it->lex, tok, NULL);
+			break;
+		case JSON_TOKEN_ARRAY_START:
+			it->isScalar = false;
+			it->state = JTI_ARRAY_START;
+			lex_accept(it->lex, tok, NULL);
+			break;
+		case JSON_TOKEN_STRING:
+		case JSON_TOKEN_NUMBER:
+		case JSON_TOKEN_TRUE:
+		case JSON_TOKEN_FALSE:
+		case JSON_TOKEN_NULL:
+			it->isScalar = true;
+			it->state = JTI_ARRAY_START;
+			break;
+		default:
+			report_parse_error(JSON_PARSE_VALUE, it->lex);
+	}
+
+	return it;
+}
+
+/*
+ * Given a JsonContainer, expand to JsonIterator to iterate over items
+ * fully expanded to in-memory representation for manipulation.
+ *
+ * See JsonbIteratorNext() for notes on memory management.
+ */
+JsonIterator *
+JsonIteratorInit(JsonContainer *jc)
+{
+	JsonLexContext *lex = makeJsonLexContextCstringLen(jc->data, jc->len, true);
+	json_lex(lex);
+	return JsonIteratorInitFromLex(jc, lex, NULL);
+}
+
+/*
+ * Serialize a single JsonbValue into text buffer.
+ */
+static void
+JsonEncodeJsonbValue(StringInfo buf, JsonbValue *jbv)
+{
+	check_stack_depth();
+
+	switch (jbv->type)
+	{
+		case jbvNull:
+			appendBinaryStringInfo(buf, "null", 4);
+			break;
+
+		case jbvBool:
+			if (jbv->val.boolean)
+				appendBinaryStringInfo(buf, "true", 4);
+			else
+				appendBinaryStringInfo(buf, "false", 5);
+			break;
+
+		case jbvNumeric:
+			appendStringInfoString(buf, DatumGetCString(DirectFunctionCall1(
+				numeric_out, NumericGetDatum(jbv->val.numeric))));
+			break;
+
+		case jbvString:
+		{
+			char	   *str = jbv->val.string.len < 0 ? jbv->val.string.val :
+				pnstrdup(jbv->val.string.val, jbv->val.string.len);
+
+			escape_json(buf, str);
+
+			if (jbv->val.string.len >= 0)
+				pfree(str);
+
+			break;
+		}
+
+		case jbvDatetime:
+			{
+				char		dtbuf[MAXDATELEN + 1];
+
+				JsonEncodeDateTime(dtbuf,
+								   jbv->val.datetime.value,
+								   jbv->val.datetime.typid);
+
+				escape_json(buf, dtbuf);
+
+				break;
+			}
+
+		case jbvArray:
+			{
+				int			i;
+
+				if (!jbv->val.array.rawScalar)
+					appendStringInfoChar(buf, '[');
+
+				for (i = 0; i < jbv->val.array.nElems; i++)
+				{
+					if (i > 0)
+						appendBinaryStringInfo(buf, ", ", 2);
+
+					JsonEncodeJsonbValue(buf, &jbv->val.array.elems[i]);
+				}
+
+				if (!jbv->val.array.rawScalar)
+					appendStringInfoChar(buf, ']');
+
+				break;
+			}
+
+		case jbvObject:
+			{
+				int			i;
+
+				appendStringInfoChar(buf, '{');
+
+				for (i = 0; i < jbv->val.object.nPairs; i++)
+				{
+					if (i > 0)
+						appendBinaryStringInfo(buf, ", ", 2);
+
+					JsonEncodeJsonbValue(buf, &jbv->val.object.pairs[i].key);
+					appendBinaryStringInfo(buf, ": ", 2);
+					JsonEncodeJsonbValue(buf, &jbv->val.object.pairs[i].value);
+				}
+
+				appendStringInfoChar(buf, '}');
+				break;
+			}
+
+		case jbvBinary:
+			{
+				JsonContainer *json = (JsonContainer *) jbv->val.binary.data;
+
+				appendBinaryStringInfo(buf, json->data, json->len);
+				break;
+			}
+
+		default:
+			elog(ERROR, "unknown jsonb value type: %d", jbv->type);
+			break;
+	}
+}
+
+/*
+ * Turn an in-memory JsonbValue into a json for on-disk storage.
+ */
+Json *
+JsonbValueToJson(JsonbValue *jbv)
+{
+	StringInfoData buf;
+	Json	   *json = palloc0(sizeof(*json));
+	int			type;
+	int			size;
+
+	if (jbv->type == jbvBinary)
+	{
+		/* simply copy the whole container and its data */
+		JsonContainer *src = (JsonContainer *) jbv->val.binary.data;
+		JsonContainerData *dst = (JsonContainerData *) &json->root;
+
+		*dst = *src;
+		dst->data = memcpy(palloc(src->len), src->data, src->len);
+
+		return json;
+	}
+
+	initStringInfo(&buf);
+
+	JsonEncodeJsonbValue(&buf, jbv);
+
+	switch (jbv->type)
+	{
+		case jbvArray:
+			type = JB_FARRAY;
+			size = jbv->val.array.nElems;
+			break;
+
+		case jbvObject:
+			type = JB_FOBJECT;
+			size = jbv->val.object.nPairs;
+			break;
+
+		default:	/* scalar */
+			type = JB_FARRAY | JB_FSCALAR;
+			size = 1;
+			break;
+	}
+
+	jsonInitContainer((JsonContainerData *) &json->root,
+					  buf.data, buf.len, type, size);
+
+	return json;
+}
+
+/* Context and semantic actions for JsonGetArraySize() */
+typedef struct JsonGetArraySizeState
+{
+	int		level;
+	uint32	size;
+} JsonGetArraySizeState;
+
+static void
+JsonGetArraySize_array_start(void *state)
+{
+	((JsonGetArraySizeState *) state)->level++;
+}
+
+static void
+JsonGetArraySize_array_end(void *state)
+{
+	((JsonGetArraySizeState *) state)->level--;
+}
+
+static void
+JsonGetArraySize_array_element_start(void *state, bool isnull)
+{
+	JsonGetArraySizeState *s = state;
+	if (s->level == 1)
+		s->size++;
+}
+
+/*
+ * Calculate the size of a json array by iterating through its elements.
+ */
+uint32
+JsonGetArraySize(JsonContainer *jc)
+{
+	JsonLexContext *lex = makeJsonLexContextCstringLen(jc->data, jc->len, false);
+	JsonSemAction	sem;
+	JsonGetArraySizeState state;
+
+	state.level = 0;
+	state.size = 0;
+
+	memset(&sem, 0, sizeof(sem));
+	sem.semstate = &state;
+	sem.array_start			= JsonGetArraySize_array_start;
+	sem.array_end 			= JsonGetArraySize_array_end;
+	sem.array_element_end	= JsonGetArraySize_array_element_start;
+
+	json_lex(lex);
+	parse_array(lex, &sem);
+
+	return state.size;
+}
+
+/*
+ * Find last key in a json object by name. Returns palloc()'d copy of the
+ * corresponding value, or NULL if is not found.
+ */
+static inline JsonbValue *
+jsonFindLastKeyInObject(JsonContainer *obj, const JsonbValue *key)
+{
+	JsonbValue *res = NULL;
+	JsonbValue	jbv;
+	JsonIterator *it;
+	JsonbIteratorToken tok;
+
+	Assert(JsonContainerIsObject(obj));
+	Assert(key->type == jbvString);
+
+	it = JsonIteratorInit(obj);
+
+	while ((tok = JsonIteratorNext(&it, &jbv, true)) != WJB_DONE)
+	{
+		if (tok == WJB_KEY && !lengthCompareJsonbStringValue(key, &jbv))
+		{
+			if (!res)
+				res = palloc(sizeof(*res));
+
+			tok = JsonIteratorNext(&it, res, true);
+			Assert(tok == WJB_VALUE);
+		}
+	}
+
+	return res;
+}
+
+/*
+ * Find scalar element in a array.  Returns palloc()'d copy of value or NULL.
+ */
+static JsonbValue *
+jsonFindValueInArray(JsonContainer *array, const JsonbValue *elem)
+{
+	JsonbValue *val = palloc(sizeof(*val));
+	JsonIterator *it;
+	JsonbIteratorToken tok;
+
+	Assert(JsonContainerIsArray(array));
+	Assert(IsAJsonbScalar(elem));
+
+	it = JsonIteratorInit(array);
+
+	while ((tok = JsonIteratorNext(&it, val, true)) != WJB_DONE)
+	{
+		if (tok == WJB_ELEM && val->type == elem->type &&
+			equalsJsonbScalarValue(val, (JsonbValue *) elem))
+		{
+			JsonIteratorFree(it);
+			return val;
+		}
+	}
+
+	pfree(val);
+	return NULL;
+}
+
+/*
+ * Find value in object (i.e. the "value" part of some key/value pair in an
+ * object), or find a matching element if we're looking through an array.
+ * The "flags" argument allows the caller to specify which container types are
+ * of interest.  If we cannot find the value, return NULL.  Otherwise, return
+ * palloc()'d copy of value.
+ *
+ * For more details, see findJsonbValueFromContainer().
+ */
+JsonbValue *
+findJsonValueFromContainer(JsonContainer *jc, uint32 flags, JsonbValue *key)
+{
+	Assert((flags & ~(JB_FARRAY | JB_FOBJECT)) == 0);
+
+	if (!JsonContainerSize(jc))
+		return NULL;
+
+	if ((flags & JB_FARRAY) && JsonContainerIsArray(jc))
+		return jsonFindValueInArray(jc, key);
+
+	if ((flags & JB_FOBJECT) && JsonContainerIsObject(jc))
+		return jsonFindLastKeyInObject(jc, key);
+
+	/* Not found */
+	return NULL;
+}
+
+/*
+ * Get i-th element of a json array.
+ *
+ * Returns palloc()'d copy of the value, or NULL if it does not exist.
+ */
+JsonbValue *
+getIthJsonValueFromContainer(JsonContainer *array, uint32 index)
+{
+	JsonbValue *val = palloc(sizeof(JsonbValue));
+	JsonIterator *it;
+	JsonbIteratorToken tok;
+
+	Assert(JsonContainerIsArray(array));
+
+	it = JsonIteratorInit(array);
+
+	while ((tok = JsonIteratorNext(&it, val, true)) != WJB_DONE)
+	{
+		if (tok == WJB_ELEM)
+		{
+			if (index-- == 0)
+			{
+				JsonIteratorFree(it);
+				return val;
+			}
+		}
+	}
+
+	pfree(val);
+
+	return NULL;
+}
+
+/*
+ * Push json JsonbValue into JsonbParseState.
+ *
+ * Used for converting an in-memory JsonbValue to a json. For more details,
+ * see pushJsonbValue(). This function differs from pushJsonbValue() only by
+ * resetting "uniquified" flag in objects.
+ */
+JsonbValue *
+pushJsonValue(JsonbParseState **pstate, JsonbIteratorToken seq,
+			  JsonbValue *jbval)
+{
+	JsonIterator *it;
+	JsonbValue *res = NULL;
+	JsonbValue	v;
+	JsonbIteratorToken tok;
+
+	if (!jbval || (seq != WJB_ELEM && seq != WJB_VALUE) ||
+		jbval->type != jbvBinary)
+	{
+		/* drop through */
+		res = pushJsonbValueScalar(pstate, seq, jbval);
+
+		/* reset "uniquified" flag of objects */
+		if (seq == WJB_BEGIN_OBJECT)
+			(*pstate)->contVal.val.object.uniquified = false;
+
+		return res;
+	}
+
+	/* unpack the binary and add each piece to the pstate */
+	it = JsonIteratorInit((JsonContainer *) jbval->val.binary.data);
+	while ((tok = JsonIteratorNext(&it, &v, false)) != WJB_DONE)
+	{
+		res = pushJsonbValueScalar(pstate, tok,
+								   tok < WJB_BEGIN_ARRAY ? &v : NULL);
+
+		/* reset "uniquified" flag of objects */
+		if (tok == WJB_BEGIN_OBJECT)
+			(*pstate)->contVal.val.object.uniquified = false;
+	}
+
+	return res;
+}
+
+JsonbValue *
+JsonExtractScalar(JsonContainer *jbc, JsonbValue *res)
+{
+	JsonIterator *it = JsonIteratorInit(jbc);
+	JsonbIteratorToken tok PG_USED_FOR_ASSERTS_ONLY;
+	JsonbValue	tmp;
+
+	tok = JsonIteratorNext(&it, &tmp, true);
+	Assert(tok == WJB_BEGIN_ARRAY);
+	Assert(tmp.val.array.nElems == 1 && tmp.val.array.rawScalar);
+
+	tok = JsonIteratorNext(&it, res, true);
+	Assert(tok == WJB_ELEM);
+	Assert(IsAJsonbScalar(res));
+
+	tok = JsonIteratorNext(&it, &tmp, true);
+	Assert(tok == WJB_END_ARRAY);
+
+	return res;
+}
+
+/*
+ * Turn a Json into its C-string representation with stripping quotes from
+ * scalar strings.
+ */
+char *
+JsonUnquote(Json *jb)
+{
+	if (JsonContainerIsScalar(&jb->root))
+	{
+		JsonbValue	v;
+
+		JsonExtractScalar(&jb->root, &v);
+
+		if (v.type == jbvString)
+			return pnstrdup(v.val.string.val, v.val.string.len);
+	}
+
+	return pnstrdup(jb->root.data, jb->root.len);
+}
+
+/*
+ * Turn a JsonContainer into its C-string representation.
+ */
+char *
+JsonToCString(StringInfo out, JsonContainer *jc, int estimated_len)
+{
+	if (out)
+	{
+		appendBinaryStringInfo(out, jc->data, jc->len);
+		return out->data;
+	}
+	else
+	{
+		char *str = palloc(jc->len + 1);
+
+		memcpy(str, jc->data, jc->len);
+		str[jc->len] = 0;
+
+		return str;
+	}
+}
diff --git a/src/backend/utils/adt/jsonb_util.c b/src/backend/utils/adt/jsonb_util.c
index b957705..b4204cd 100644
--- a/src/backend/utils/adt/jsonb_util.c
+++ b/src/backend/utils/adt/jsonb_util.c
@@ -39,7 +39,6 @@
 static void fillJsonbValue(JsonbContainer *container, int index,
 			   char *base_addr, uint32 offset,
 			   JsonbValue *result);
-static bool equalsJsonbScalarValue(JsonbValue *a, JsonbValue *b);
 static int	compareJsonbScalarValue(JsonbValue *a, JsonbValue *b);
 static Jsonb *convertToJsonb(JsonbValue *val);
 static void convertJsonbValue(StringInfo buffer, JEntry *header, JsonbValue *val, int level);
@@ -58,12 +57,8 @@ static JsonbParseState *pushState(JsonbParseState **pstate);
 static void appendKey(JsonbParseState *pstate, JsonbValue *scalarVal);
 static void appendValue(JsonbParseState *pstate, JsonbValue *scalarVal);
 static void appendElement(JsonbParseState *pstate, JsonbValue *scalarVal);
-static int	lengthCompareJsonbStringValue(const void *a, const void *b);
 static int	lengthCompareJsonbPair(const void *a, const void *b, void *arg);
 static void uniqueifyJsonbObject(JsonbValue *object);
-static JsonbValue *pushJsonbValueScalar(JsonbParseState **pstate,
-					 JsonbIteratorToken seq,
-					 JsonbValue *scalarVal);
 
 /*
  * Turn an in-memory JsonbValue into a Jsonb for on-disk storage.
@@ -546,7 +541,7 @@ pushJsonbValue(JsonbParseState **pstate, JsonbIteratorToken seq,
  * Do the actual pushing, with only scalar or pseudo-scalar-array values
  * accepted.
  */
-static JsonbValue *
+JsonbValue *
 pushJsonbValueScalar(JsonbParseState **pstate, JsonbIteratorToken seq,
 					 JsonbValue *scalarVal)
 {
@@ -584,6 +579,7 @@ pushJsonbValueScalar(JsonbParseState **pstate, JsonbIteratorToken seq,
 			(*pstate)->size = 4;
 			(*pstate)->contVal.val.object.pairs = palloc(sizeof(JsonbPair) *
 														 (*pstate)->size);
+			(*pstate)->contVal.val.object.uniquified = true;
 			break;
 		case WJB_KEY:
 			Assert(scalarVal->type == jbvString);
@@ -826,6 +822,7 @@ recurse:
 			/* Set v to object on first object call */
 			val->type = jbvObject;
 			val->val.object.nPairs = (*it)->nElems;
+			val->val.object.uniquified = true;
 
 			/*
 			 * v->val.object.pairs is not actually set, because we aren't
@@ -1299,7 +1296,7 @@ JsonbHashScalarValueExtended(const JsonbValue *scalarVal, uint64 *hash,
 /*
  * Are two scalar JsonbValues of the same type a and b equal?
  */
-static bool
+bool
 equalsJsonbScalarValue(JsonbValue *aScalar, JsonbValue *bScalar)
 {
 	if (aScalar->type == bScalar->type)
@@ -1778,7 +1775,7 @@ convertJsonbScalar(StringInfo buffer, JEntry *jentry, JsonbValue *scalarVal)
  * a and b are first sorted based on their length.  If a tie-breaker is
  * required, only then do we consider string binary equality.
  */
-static int
+int
 lengthCompareJsonbStringValue(const void *a, const void *b)
 {
 	const JsonbValue *va = (const JsonbValue *) a;
@@ -1842,6 +1839,9 @@ uniqueifyJsonbObject(JsonbValue *object)
 
 	Assert(object->type == jbvObject);
 
+	if (!object->val.object.uniquified)
+		return;
+
 	if (object->val.object.nPairs > 1)
 		qsort_arg(object->val.object.pairs, object->val.object.nPairs, sizeof(JsonbPair),
 				  lengthCompareJsonbPair, &hasNonUniq);
diff --git a/src/backend/utils/adt/jsonpath_exec.c b/src/backend/utils/adt/jsonpath_exec.c
index df19db1..6b7367f 100644
--- a/src/backend/utils/adt/jsonpath_exec.c
+++ b/src/backend/utils/adt/jsonpath_exec.c
@@ -23,6 +23,12 @@
 #include "utils/jsonpath.h"
 #include "utils/varlena.h"
 
+#ifdef JSONPATH_JSON_C
+#define JSONXOID JSONOID
+#else
+#define JSONXOID JSONBOID
+#endif
+
 typedef struct JsonPathExecContext
 {
 	List	   *vars;
@@ -155,6 +161,7 @@ JsonValueListNext(const JsonValueList *jvl, JsonValueListIterator *it)
 	return lfirst(it->lcell);
 }
 
+#ifndef JSONPATH_JSON_C
 /*
  * Initialize a binary JsonbValue with the given jsonb container.
  */
@@ -167,6 +174,7 @@ JsonbInitBinary(JsonbValue *jbv, Jsonb *jb)
 
 	return jbv;
 }
+#endif
 
 /*
  * Transform a JsonbValue into a binary JsonbValue by encoding it to a
@@ -278,7 +286,7 @@ computeJsonPathVariable(JsonPathItem *variable, List *vars, JsonbValue *value)
 			value->val.datetime.typmod = var->typmod;
 			value->val.datetime.value = computedValue;
 			break;
-		case JSONBOID:
+		case JSONXOID:
 			{
 				Jsonb	   *jb = DatumGetJsonbP(computedValue);
 
@@ -344,7 +352,7 @@ JsonbType(JsonbValue *jb)
 
 	if (jb->type == jbvBinary)
 	{
-		JsonbContainer	*jbc = jb->val.binary.data;
+		JsonbContainer	*jbc = (void *) jb->val.binary.data;
 
 		if (JsonContainerIsScalar(jbc))
 			type = jbvScalar;
@@ -369,7 +377,7 @@ JsonbTypeName(JsonbValue *jb)
 
 	if (jb->type == jbvBinary)
 	{
-		JsonbContainer *jbc = jb->val.binary.data;
+		JsonbContainer *jbc = (void *) jb->val.binary.data;
 
 		if (JsonContainerIsScalar(jbc))
 			jb = JsonbExtractScalar(jbc, &jbvbuf);
@@ -430,7 +438,7 @@ JsonbArraySize(JsonbValue *jb)
 
 	if (jb->type == jbvBinary)
 	{
-		JsonbContainer *jbc = jb->val.binary.data;
+		JsonbContainer *jbc =  (void *) jb->val.binary.data;
 
 		if (JsonContainerIsArray(jbc) && !JsonContainerIsScalar(jbc))
 			return JsonContainerSize(jbc);
@@ -2372,7 +2380,7 @@ makePassingVars(Jsonb *jb)
 					jpv->cb_arg = v.val.numeric;
 					break;
 				case jbvBinary:
-					jpv->typid = JSONBOID;
+					jpv->typid = JSONXOID;
 					jpv->cb_arg = DatumGetPointer(JsonbPGetDatum(JsonbValueToJsonb(&v)));
 					break;
 				default:
diff --git a/src/backend/utils/adt/jsonpath_json.c b/src/backend/utils/adt/jsonpath_json.c
new file mode 100644
index 0000000..720af51
--- /dev/null
+++ b/src/backend/utils/adt/jsonpath_json.c
@@ -0,0 +1,20 @@
+#define JSONPATH_JSON_C
+
+#include "postgres.h"
+
+#include "catalog/pg_type.h"
+#include "utils/json.h"
+#include "utils/jsonapi.h"
+#include "utils/jsonb.h"
+#include "utils/builtins.h"
+
+#include "utils/jsonpath_json.h"
+
+#define jsonb_jsonpath_exists2		json_jsonpath_exists2
+#define jsonb_jsonpath_exists3		json_jsonpath_exists3
+#define jsonb_jsonpath_predicate2	json_jsonpath_predicate2
+#define jsonb_jsonpath_predicate3	json_jsonpath_predicate3
+#define jsonb_jsonpath_query2		json_jsonpath_query2
+#define jsonb_jsonpath_query3		json_jsonpath_query3
+
+#include "jsonpath_exec.c"
diff --git a/src/include/catalog/pg_operator.h b/src/include/catalog/pg_operator.h
index 21b5267..83d6af2 100644
--- a/src/include/catalog/pg_operator.h
+++ b/src/include/catalog/pg_operator.h
@@ -1859,5 +1859,11 @@ DATA(insert OID = 6076 (  "@?"	   PGNSP PGUID b f f 3802 6050 16 0 0 6054 contse
 DESCR("jsonpath exists");
 DATA(insert OID = 6107 (  "@~"	   PGNSP PGUID b f f 3802 6050 16 0 0 6073 contsel contjoinsel ));
 DESCR("jsonpath predicate");
+DATA(insert OID = 6070 (  "@*"	   PGNSP PGUID b f f 114 6050 114 0 0 6044 - - ));
+DESCR("jsonpath items");
+DATA(insert OID = 6071 (  "@?"	   PGNSP PGUID b f f 114 6050 16 0 0 6043 contsel contjoinsel ));
+DESCR("jsonpath exists");
+DATA(insert OID = 6108 (  "@~"	   PGNSP PGUID b f f 114 6050 16 0 0 6049 contsel contjoinsel ));
+DESCR("jsonpath predicate");
 
 #endif							/* PG_OPERATOR_H */
diff --git a/src/include/catalog/pg_proc.h b/src/include/catalog/pg_proc.h
index d9a4c37..20cc076 100644
--- a/src/include/catalog/pg_proc.h
+++ b/src/include/catalog/pg_proc.h
@@ -5549,6 +5549,19 @@ DESCR("implementation of @~ operator");
 DATA(insert OID =  6074 (  jsonpath_predicate	PGNSP PGUID 12 1 0 0 0 f f f f t f i s 3 0 16 "3802 6050 3802" _null_ _null_ _null_ _null_ _null_ jsonb_jsonpath_predicate3 _null_ _null_ _null_ ));
 DESCR("jsonpath predicate test");
 
+DATA(insert OID =  6043 (  jsonpath_exists		PGNSP PGUID 12 1 0 0 0 f f f f t f i s 2 0 16 "114 6050" _null_ _null_ _null_ _null_ _null_ json_jsonpath_exists2 _null_ _null_ _null_ ));
+DESCR("implementation of @? operator");
+DATA(insert OID =  6044 (  jsonpath_query		PGNSP PGUID 12 1 1000 0 0 f f f f t t i s 2 0 114 "114 6050" _null_ _null_ _null_ _null_ _null_ json_jsonpath_query2 _null_ _null_ _null_ ));
+DESCR("implementation of @* operator");
+DATA(insert OID =  6045 (  jsonpath_exists		PGNSP PGUID 12 1 0 0 0 f f f f t f i s 3 0 16 "114 6050 114" _null_ _null_ _null_ _null_ _null_ json_jsonpath_exists3 _null_ _null_ _null_ ));
+DESCR("jsonpath exists test");
+DATA(insert OID =  6046 (  jsonpath_query		PGNSP PGUID 12 1 1000 0 0 f f f f t t i s 3 0 114 "114 6050 114" _null_ _null_ _null_ _null_ _null_ json_jsonpath_query3 _null_ _null_ _null_ ));
+DESCR("jsonpath query");
+DATA(insert OID =  6049 (  jsonpath_predicate	PGNSP PGUID 12 1 0 0 0 f f f f t f i s 2 0 16 "114 6050" _null_ _null_ _null_ _null_ _null_ json_jsonpath_predicate2 _null_ _null_ _null_ ));
+DESCR("implementation of @~ operator");
+DATA(insert OID =  6069 (  jsonpath_predicate	PGNSP PGUID 12 1 0 0 0 f f f f t f i s 3 0 16 "114 6050 114" _null_ _null_ _null_ _null_ _null_ json_jsonpath_predicate3 _null_ _null_ _null_ ));
+DESCR("jsonpath predicate test");
+
 /*
  * Symbolic values for provolatile column: these indicate whether the result
  * of a function is dependent *only* on the values of its explicit arguments,
diff --git a/src/include/utils/jsonapi.h b/src/include/utils/jsonapi.h
index 180461a..78c9be7 100644
--- a/src/include/utils/jsonapi.h
+++ b/src/include/utils/jsonapi.h
@@ -15,6 +15,7 @@
 #define JSONAPI_H
 
 #include "jsonb.h"
+#include "access/htup.h"
 #include "lib/stringinfo.h"
 
 typedef enum
@@ -93,6 +94,48 @@ typedef struct JsonSemAction
 	json_scalar_action scalar;
 } JsonSemAction;
 
+typedef enum
+{
+	JTI_ARRAY_START,
+	JTI_ARRAY_ELEM,
+	JTI_ARRAY_ELEM_SCALAR,
+	JTI_ARRAY_ELEM_AFTER,
+	JTI_ARRAY_END,
+	JTI_OBJECT_START,
+	JTI_OBJECT_KEY,
+	JTI_OBJECT_VALUE,
+	JTI_OBJECT_VALUE_AFTER,
+} JsontIterState;
+
+typedef struct JsonContainerData
+{
+	uint32		header;
+	int			len;
+	char	   *data;
+} JsonContainerData;
+
+typedef const JsonContainerData JsonContainer;
+
+typedef struct Json
+{
+	JsonContainer root;
+} Json;
+
+typedef struct JsonIterator
+{
+	struct JsonIterator	*parent;
+	JsonContainer *container;
+	JsonLexContext *lex;
+	JsontIterState state;
+	bool		isScalar;
+} JsonIterator;
+
+#define DatumGetJsonP(datum) JsonCreate(DatumGetTextP(datum))
+#define DatumGetJsonPCopy(datum) JsonCreate(DatumGetTextPCopy(datum))
+
+#define JsonPGetDatum(json) \
+	PointerGetDatum(cstring_to_text_with_len((json)->root.data, (json)->root.len))
+
 /*
  * parse_json will parse the string in the lex calling the
  * action functions in sem at the appropriate points. It is
@@ -149,4 +192,22 @@ extern text *transform_json_string_values(text *json, void *action_state,
 
 extern char *JsonEncodeDateTime(char *buf, Datum value, Oid typid);
 
+extern Json *JsonCreate(text *json);
+extern JsonbIteratorToken JsonIteratorNext(JsonIterator **pit, JsonbValue *val,
+				 bool skipNested);
+extern JsonIterator *JsonIteratorInit(JsonContainer *jc);
+extern void JsonIteratorFree(JsonIterator *it);
+extern uint32 JsonGetArraySize(JsonContainer *jc);
+extern Json *JsonbValueToJson(JsonbValue *jbv);
+extern JsonbValue *JsonExtractScalar(JsonContainer *jbc, JsonbValue *res);
+extern char *JsonUnquote(Json *jb);
+extern char *JsonToCString(StringInfo out, JsonContainer *jc,
+			  int estimated_len);
+extern JsonbValue *pushJsonValue(JsonbParseState **pstate,
+			  JsonbIteratorToken tok, JsonbValue *jbv);
+extern JsonbValue *findJsonValueFromContainer(JsonContainer *jc, uint32 flags,
+						   JsonbValue *key);
+extern JsonbValue *getIthJsonValueFromContainer(JsonContainer *array,
+							 uint32 index);
+
 #endif							/* JSONAPI_H */
diff --git a/src/include/utils/jsonb.h b/src/include/utils/jsonb.h
index f509b34..aa55615 100644
--- a/src/include/utils/jsonb.h
+++ b/src/include/utils/jsonb.h
@@ -224,10 +224,10 @@ typedef struct
 } Jsonb;
 
 /* convenience macros for accessing the root container in a Jsonb datum */
-#define JB_ROOT_COUNT(jbp_)		(*(uint32 *) VARDATA(jbp_) & JB_CMASK)
-#define JB_ROOT_IS_SCALAR(jbp_) ((*(uint32 *) VARDATA(jbp_) & JB_FSCALAR) != 0)
-#define JB_ROOT_IS_OBJECT(jbp_) ((*(uint32 *) VARDATA(jbp_) & JB_FOBJECT) != 0)
-#define JB_ROOT_IS_ARRAY(jbp_)	((*(uint32 *) VARDATA(jbp_) & JB_FARRAY) != 0)
+#define JB_ROOT_COUNT(jbp_)		JsonContainerSize(&(jbp_)->root)
+#define JB_ROOT_IS_SCALAR(jbp_) JsonContainerIsScalar(&(jbp_)->root)
+#define JB_ROOT_IS_OBJECT(jbp_) JsonContainerIsObject(&(jbp_)->root)
+#define JB_ROOT_IS_ARRAY(jbp_)	JsonContainerIsArray(&(jbp_)->root)
 
 
 enum jbvType
@@ -276,6 +276,8 @@ struct JsonbValue
 		struct
 		{
 			int			nPairs; /* 1 pair, 2 elements */
+			bool		uniquified;	/* Should we sort pairs by key name and
+									 * remove duplicate keys? */
 			JsonbPair  *pairs;
 		}			object;		/* Associative container type */
 
@@ -370,6 +372,8 @@ typedef struct JsonbIterator
 /* Support functions */
 extern uint32 getJsonbOffset(const JsonbContainer *jc, int index);
 extern uint32 getJsonbLength(const JsonbContainer *jc, int index);
+extern int lengthCompareJsonbStringValue(const void *a, const void *b);
+extern bool equalsJsonbScalarValue(JsonbValue *a, JsonbValue *b);
 extern int	compareJsonbContainers(JsonbContainer *a, JsonbContainer *b);
 extern JsonbValue *findJsonbValueFromContainer(JsonbContainer *sheader,
 							uint32 flags,
@@ -378,6 +382,8 @@ extern JsonbValue *getIthJsonbValueFromContainer(JsonbContainer *sheader,
 							  uint32 i);
 extern JsonbValue *pushJsonbValue(JsonbParseState **pstate,
 			   JsonbIteratorToken seq, JsonbValue *jbVal);
+extern JsonbValue *pushJsonbValueScalar(JsonbParseState **pstate,
+					 JsonbIteratorToken seq,JsonbValue *scalarVal);
 extern JsonbIterator *JsonbIteratorInit(JsonbContainer *container);
 extern JsonbIteratorToken JsonbIteratorNext(JsonbIterator **it, JsonbValue *val,
 				  bool skipNested);
diff --git a/src/include/utils/jsonpath_json.h b/src/include/utils/jsonpath_json.h
new file mode 100644
index 0000000..ee59344
--- /dev/null
+++ b/src/include/utils/jsonpath_json.h
@@ -0,0 +1,110 @@
+/*-------------------------------------------------------------------------
+ *
+ * jsonpath_json.h
+ *	Jsonpath support for json datatype
+ *
+ * Copyright (c) 2017, PostgreSQL Global Development Group
+ *
+ * IDENTIFICATION
+ *	src/include/utils/jsonpath_json.h
+ *
+ *-------------------------------------------------------------------------
+ */
+
+#ifndef JSONPATH_JSON_H
+#define JSONPATH_JSON_H
+
+/* redefine jsonb structures */
+#define Jsonb Json
+#define JsonbContainer JsonContainer
+#define JsonbIterator JsonIterator
+
+/* redefine jsonb functions */
+#define findJsonbValueFromContainer(jc, flags, jbv) \
+		findJsonValueFromContainer((JsonContainer *)(jc), flags, jbv)
+#define getIthJsonbValueFromContainer(jc, i) \
+		getIthJsonValueFromContainer((JsonContainer *)(jc), i)
+#define pushJsonbValue pushJsonValue
+#define JsonbIteratorInit(jc) JsonIteratorInit((JsonContainer *)(jc))
+#define JsonbIteratorNext JsonIteratorNext
+#define JsonbValueToJsonb JsonbValueToJson
+#define JsonbToCString JsonToCString
+#define JsonbUnquote JsonUnquote
+#define JsonbExtractScalar(jc, jbv) JsonExtractScalar((JsonContainer *)(jc), jbv)
+
+/* redefine jsonb macros */
+#undef JsonContainerSize
+#define JsonContainerSize(jc) \
+	((((JsonContainer *)(jc))->header & JB_CMASK) == JB_CMASK && \
+	 JsonContainerIsArray(jc) \
+		? JsonGetArraySize((JsonContainer *)(jc)) \
+		: ((JsonContainer *)(jc))->header & JB_CMASK)
+
+
+#undef DatumGetJsonbP
+#define DatumGetJsonbP(d)	DatumGetJsonP(d)
+
+#undef DatumGetJsonbPCopy
+#define DatumGetJsonbPCopy(d)	DatumGetJsonPCopy(d)
+
+#undef JsonbPGetDatum
+#define JsonbPGetDatum(json)	JsonPGetDatum(json)
+
+#undef PG_GETARG_JSONB_P
+#define PG_GETARG_JSONB_P(n)	DatumGetJsonP(PG_GETARG_DATUM(n))
+
+#undef PG_GETARG_JSONB_P_COPY
+#define PG_GETARG_JSONB_P_COPY(n)	DatumGetJsonPCopy(PG_GETARG_DATUM(n))
+
+
+#ifdef DatumGetJsonb
+#undef DatumGetJsonb
+#define DatumGetJsonb(d)	DatumGetJsonbP(d)
+#endif
+
+#ifdef DatumGetJsonbCopy
+#undef DatumGetJsonbCopy
+#define DatumGetJsonbCopy(d)	DatumGetJsonbPCopy(d)
+#endif
+
+#ifdef JsonbGetDatum
+#undef JsonbGetDatum
+#define JsonbGetDatum(json)	JsonbPGetDatum(json)
+#endif
+
+#ifdef PG_GETARG_JSONB
+#undef PG_GETARG_JSONB
+#define PG_GETARG_JSONB(n)	PG_GETARG_JSONB_P(n)
+#endif
+
+#ifdef PG_GETARG_JSONB_COPY
+#undef PG_GETARG_JSONB_COPY
+#define PG_GETARG_JSONB_COPY(n)	PG_GETARG_JSONB_P_COPY(n)
+#endif
+
+/* redefine global jsonpath functions */
+#define executeJsonPath		executeJsonPathJson
+#define JsonbPathExists		JsonPathExists
+#define JsonbPathQuery		JsonPathQuery
+#define JsonbPathValue		JsonPathValue
+#define JsonbTableRoutine	JsonTableRoutine
+
+#define JsonbWrapItemInArray JsonWrapItemInArray
+#define JsonbWrapItemsInArray JsonWrapItemsInArray
+#define JsonbArraySize JsonArraySize
+#define JsonValueListConcat JsonValueListConcatJson
+#define jspRecursiveExecute jspRecursiveExecuteJson
+#define jspRecursiveExecuteNested jspRecursiveExecuteNestedJson
+#define jspCompareItems jspCompareItemsJson
+
+static inline JsonbValue *
+JsonbInitBinary(JsonbValue *jbv, Json *jb)
+{
+	jbv->type = jbvBinary;
+	jbv->val.binary.data = (void *) &jb->root;
+	jbv->val.binary.len = jb->root.len;
+
+	return jbv;
+}
+
+#endif /* JSONPATH_JSON_H */
diff --git a/src/test/regress/expected/json_jsonpath.out b/src/test/regress/expected/json_jsonpath.out
new file mode 100644
index 0000000..5200847
--- /dev/null
+++ b/src/test/regress/expected/json_jsonpath.out
@@ -0,0 +1,1649 @@
+select json '{"a": 12}' @? '$.a.b';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": 12}' @? '$.b';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": {"a": 12}}' @? '$.a.a';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"a": 12}}' @? '$.*.a';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"b": {"a": 12}}' @? '$.*.a';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{}' @? '$.*';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": 1}' @? '$.*';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"b": 1}}' @? 'lax $.**{1}';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"b": 1}}' @? 'lax $.**{2}';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"b": 1}}' @? 'lax $.**{3}';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '[]' @? '$.[*]';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '[1]' @? '$.[*]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1]' @? '$.[1]';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '[1]' @? 'strict $.[1]';
+ERROR:  Invalid SQL/JSON subscript
+select json '[1]' @? '$.[0]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1]' @? '$.[0.3]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1]' @? '$.[0.5]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1]' @? '$.[0.9]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1]' @? '$.[1.2]';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '[1]' @? 'strict $.[1.2]';
+ERROR:  Invalid SQL/JSON subscript
+select json '{}' @? 'strict $.[0.3]';
+ERROR:  SQL/JSON array not found
+select json '{}' @? 'lax $.[0.3]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{}' @? 'strict $.[1.2]';
+ERROR:  SQL/JSON array not found
+select json '{}' @? 'lax $.[1.2]';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{}' @? 'strict $.[-2 to 3]';
+ERROR:  SQL/JSON array not found
+select json '{}' @? 'lax $.[-2 to 3]';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >  @.b[*])';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": [1,2,3], "b": [3,4,"5"]}' @? '$ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": [1,2,3], "b": [3,4,"5"]}' @? 'strict $ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": [1,2,3], "b": [3,4,null]}' @? '$ ? (@.a[*] >= @.b[*])';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '1' @? '$ ? ((@ == "1") is unknown)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '1' @? '$ ? ((@ == 1) is unknown)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '[{"a": 1}, {"a": 2}]' @? '$[0 to 1] ? (@.a > 1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": 12, "b": {"a": 13}}' @* '$.a';
+ ?column? 
+----------
+ 12
+(1 row)
+
+select json '{"a": 12, "b": {"a": 13}}' @* '$.b';
+ ?column?  
+-----------
+ {"a": 13}
+(1 row)
+
+select json '{"a": 12, "b": {"a": 13}}' @* '$.*';
+ ?column?  
+-----------
+ 12
+ {"a": 13}
+(2 rows)
+
+select json '{"a": 12, "b": {"a": 13}}' @* 'lax $.*.a';
+ ?column? 
+----------
+ 13
+(1 row)
+
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[*].a';
+ ?column? 
+----------
+ 13
+(1 row)
+
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[*].*';
+ ?column? 
+----------
+ 13
+ 14
+(2 rows)
+
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[0].a';
+ ?column? 
+----------
+(0 rows)
+
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[1].a';
+ ?column? 
+----------
+ 13
+(1 row)
+
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[2].a';
+ ?column? 
+----------
+(0 rows)
+
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[0,1].a';
+ ?column? 
+----------
+ 13
+(1 row)
+
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[0 to 10].a';
+ ?column? 
+----------
+ 13
+(1 row)
+
+select json '[12, {"a": 13}, {"b": 14}, "ccc", true]' @* '$.[2.5 - 1 to @.size() - 2]';
+ ?column?  
+-----------
+ {"a": 13}
+ {"b": 14}
+ "ccc"
+(3 rows)
+
+select json '1' @* 'lax $[0]';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '1' @* 'lax $[*]';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{}' @* 'lax $[0]';
+ ?column? 
+----------
+ {}
+(1 row)
+
+select json '[1]' @* 'lax $[0]';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '[1]' @* 'lax $[*]';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '[1,2,3]' @* 'lax $[*]';
+ ?column? 
+----------
+ 1
+ 2
+ 3
+(3 rows)
+
+select json '[]' @* '$[last]';
+ ?column? 
+----------
+(0 rows)
+
+select json '[]' @* 'strict $[last]';
+ERROR:  Invalid SQL/JSON subscript
+select json '[1]' @* '$[last]';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{}' @* 'lax $[last]';
+ ?column? 
+----------
+ {}
+(1 row)
+
+select json '[1,2,3]' @* '$[last]';
+ ?column? 
+----------
+ 3
+(1 row)
+
+select json '[1,2,3]' @* '$[last - 1]';
+ ?column? 
+----------
+ 2
+(1 row)
+
+select json '[1,2,3]' @* '$[last ? (@.type() == "number")]';
+ ?column? 
+----------
+ 3
+(1 row)
+
+select json '[1,2,3]' @* '$[last ? (@.type() == "string")]';
+ERROR:  Invalid SQL/JSON subscript
+select * from jsonpath_query(json '{"a": 10}', '$');
+ jsonpath_query 
+----------------
+ {"a": 10}
+(1 row)
+
+select * from jsonpath_query(json '{"a": 10}', '$ ? (.a < $value)');
+ERROR:  could not find 'value' passed variable
+select * from jsonpath_query(json '{"a": 10}', '$ ? (.a < $value)', '{"value" : 13}');
+ jsonpath_query 
+----------------
+ {"a": 10}
+(1 row)
+
+select * from jsonpath_query(json '{"a": 10}', '$ ? (.a < $value)', '{"value" : 8}');
+ jsonpath_query 
+----------------
+(0 rows)
+
+select * from jsonpath_query(json '{"a": 10}', '$.a ? (@ < $value)', '{"value" : 13}');
+ jsonpath_query 
+----------------
+ 10
+(1 row)
+
+select * from jsonpath_query(json '[10,11,12,13,14,15]', '$.[*] ? (@ < $value)', '{"value" : 13}');
+ jsonpath_query 
+----------------
+ 10
+ 11
+ 12
+(3 rows)
+
+select * from jsonpath_query(json '[10,11,12,13,14,15]', '$.[0,1] ? (@ < $value)', '{"value" : 13}');
+ jsonpath_query 
+----------------
+ 10
+ 11
+(2 rows)
+
+select * from jsonpath_query(json '[10,11,12,13,14,15]', '$.[0 to 2] ? (@ < $value)', '{"value" : 15}');
+ jsonpath_query 
+----------------
+ 10
+ 11
+ 12
+(3 rows)
+
+select * from jsonpath_query(json '[1,"1",2,"2",null]', '$.[*] ? (@ == "1")');
+ jsonpath_query 
+----------------
+ "1"
+(1 row)
+
+select * from jsonpath_query(json '[1,"1",2,"2",null]', '$.[*] ? (@ == $value)', '{"value" : "1"}');
+ jsonpath_query 
+----------------
+ "1"
+(1 row)
+
+select json '[1, "2", null]' @* '$[*] ? (@ != null)';
+ ?column? 
+----------
+ 1
+ "2"
+(2 rows)
+
+select json '[1, "2", null]' @* '$[*] ? (@ == null)';
+ ?column? 
+----------
+ null
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**';
+    ?column?     
+-----------------
+ {"a": {"b": 1}}
+ {"b": 1}
+ 1
+(3 rows)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{1}';
+ ?column? 
+----------
+ {"b": 1}
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{1,}';
+ ?column? 
+----------
+ {"b": 1}
+ 1
+(2 rows)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{2}';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{2,}';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{3,}';
+ ?column? 
+----------
+(0 rows)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{0}.b ? (@ > 0)';
+ ?column? 
+----------
+(0 rows)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{1}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{0,}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{1,}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"b": 1}}' @* 'lax $.**{1,2}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{0}.b ? (@ > 0)';
+ ?column? 
+----------
+(0 rows)
+
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{1}.b ? (@ > 0)';
+ ?column? 
+----------
+(0 rows)
+
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{0,}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{1,}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{1,2}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{2,3}.b ? (@ > 0)';
+ ?column? 
+----------
+ 1
+(1 row)
+
+select json '{"a": {"b": 1}}' @? '$.**.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"b": 1}}' @? '$.**{0}.b ? ( @ > 0)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": {"b": 1}}' @? '$.**{1}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"b": 1}}' @? '$.**{0,}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"b": 1}}' @? '$.**{1,}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"b": 1}}' @? '$.**{1,2}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @? '$.**.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{0}.b ? ( @ > 0)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{1}.b ? ( @ > 0)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{0,}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{1,}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{1,2}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{2,3}.b ? ( @ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"g": {"x": 2}}' @* '$.g ? (exists (@.x))';
+ ?column? 
+----------
+ {"x": 2}
+(1 row)
+
+select json '{"g": {"x": 2}}' @* '$.g ? (exists (@.y))';
+ ?column? 
+----------
+(0 rows)
+
+select json '{"g": {"x": 2}}' @* '$.g ? (exists (@.x ? (@ >= 2) ))';
+ ?column? 
+----------
+ {"x": 2}
+(1 row)
+
+--test ternary logic
+select
+	x, y,
+	jsonpath_query(
+		json '[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true && $y == true) ||
+				 @ == false && !($x == true && $y == true) ||
+				 @ == null  &&  ($x == true && $y == true) is unknown)',
+		json_build_object('x', x, 'y', y)
+	) as "x && y"
+from
+	(values (json 'true'), ('false'), ('"null"')) x(x),
+	(values (json 'true'), ('false'), ('"null"')) y(y);
+   x    |   y    | x && y 
+--------+--------+--------
+ true   | true   | true
+ true   | false  | false
+ true   | "null" | null
+ false  | true   | false
+ false  | false  | false
+ false  | "null" | false
+ "null" | true   | null
+ "null" | false  | false
+ "null" | "null" | null
+(9 rows)
+
+select
+	x, y,
+	jsonpath_query(
+		json '[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true || $y == true) ||
+				 @ == false && !($x == true || $y == true) ||
+				 @ == null  &&  ($x == true || $y == true) is unknown)',
+		json_build_object('x', x, 'y', y)
+	) as "x || y"
+from
+	(values (json 'true'), ('false'), ('"null"')) x(x),
+	(values (json 'true'), ('false'), ('"null"')) y(y);
+   x    |   y    | x || y 
+--------+--------+--------
+ true   | true   | true
+ true   | false  | true
+ true   | "null" | true
+ false  | true   | true
+ false  | false  | false
+ false  | "null" | null
+ "null" | true   | true
+ "null" | false  | null
+ "null" | "null" | null
+(9 rows)
+
+select json '{"a": 1, "b": 1}' @? '$ ? (.a == .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 1, "b": 1}}' @? '$ ? (.a == .b)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '{"c": {"a": 1, "b": 1}}' @? '$.c ? (.a == .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 1, "b": 1}}' @? '$.c ? ($.c.a == .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 1, "b": 1}}' @? '$.* ? (.a == .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"a": 1, "b": 1}' @? '$.** ? (.a == .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 1, "b": 1}}' @? '$.** ? (.a == .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == 1 + 1)';
+     ?column?     
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == (1 + 1))';
+     ?column?     
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == .b + 1)';
+     ?column?     
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == (.b + 1))';
+     ?column?     
+------------------
+ {"a": 2, "b": 1}
+(1 row)
+
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == - 1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == -1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == -.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == - .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 0, "b": 1}}' @? '$.** ? (.a == 1 - .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 2, "b": 1}}' @? '$.** ? (.a == 1 - - .b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '{"c": {"a": 0, "b": 1}}' @? '$.** ? (.a == 1 - +.b)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1,2,3]' @? '$ ? (+@[*] > +2)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1,2,3]' @? '$ ? (+@[*] > +3)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '[1,2,3]' @? '$ ? (-@[*] < -2)';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '[1,2,3]' @? '$ ? (-@[*] < -3)';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '1' @? '$ ? ($ > 0)';
+ ?column? 
+----------
+ t
+(1 row)
+
+-- unwrapping of operator arguments in lax mode
+select json '{"a": [2]}' @* 'lax $.a * 3';
+ ?column? 
+----------
+ 6
+(1 row)
+
+select json '{"a": [2]}' @* 'lax $.a + 3';
+ ?column? 
+----------
+ 5
+(1 row)
+
+select json '{"a": [2, 3, 4]}' @* 'lax -$.a';
+ ?column? 
+----------
+ -2
+ -3
+ -4
+(3 rows)
+
+-- should fail
+select json '{"a": [1, 2]}' @* 'lax $.a * 3';
+ERROR:  Singleton SQL/JSON item required
+-- extension: boolean expressions
+select json '2' @* '$ > 1';
+ ?column? 
+----------
+ true
+(1 row)
+
+select json '2' @* '$ <= 1';
+ ?column? 
+----------
+ false
+(1 row)
+
+select json '2' @* '$ == "2"';
+ ?column? 
+----------
+ null
+(1 row)
+
+select json '2' @~ '$ > 1';
+ ?column? 
+----------
+ t
+(1 row)
+
+select json '2' @~ '$ <= 1';
+ ?column? 
+----------
+ f
+(1 row)
+
+select json '2' @~ '$ == "2"';
+ ?column? 
+----------
+ 
+(1 row)
+
+select json '2' @~ '1';
+ ?column? 
+----------
+ 
+(1 row)
+
+select json '{}' @~ '$';
+ ?column? 
+----------
+ 
+(1 row)
+
+select json '[]' @~ '$';
+ ?column? 
+----------
+ 
+(1 row)
+
+select json '[1,2,3]' @~ '$[*]';
+ERROR:  Singleton SQL/JSON item required
+select json '[]' @~ '$[*]';
+ERROR:  Singleton SQL/JSON item required
+select jsonpath_predicate(json '[[1, true], [2, false]]', 'strict $[*] ? (@[0] > $x) [1]', '{"x": 1}');
+ jsonpath_predicate 
+--------------------
+ f
+(1 row)
+
+select jsonpath_predicate(json '[[1, true], [2, false]]', 'strict $[*] ? (@[0] < $x) [1]', '{"x": 2}');
+ jsonpath_predicate 
+--------------------
+ t
+(1 row)
+
+select json '[null,1,true,"a",[],{}]' @* '$.type()';
+ ?column? 
+----------
+ "array"
+(1 row)
+
+select json '[null,1,true,"a",[],{}]' @* 'lax $.type()';
+ ?column? 
+----------
+ "array"
+(1 row)
+
+select json '[null,1,true,"a",[],{}]' @* '$[*].type()';
+ ?column?  
+-----------
+ "null"
+ "number"
+ "boolean"
+ "string"
+ "array"
+ "object"
+(6 rows)
+
+select json 'null' @* 'null.type()';
+ ?column? 
+----------
+ "null"
+(1 row)
+
+select json 'null' @* 'true.type()';
+ ?column?  
+-----------
+ "boolean"
+(1 row)
+
+select json 'null' @* '123.type()';
+ ?column? 
+----------
+ "number"
+(1 row)
+
+select json 'null' @* '"123".type()';
+ ?column? 
+----------
+ "string"
+(1 row)
+
+select json '{"a": 2}' @* '($.a - 5).abs() + 10';
+ ?column? 
+----------
+ 13
+(1 row)
+
+select json '{"a": 2.5}' @* '-($.a * $.a).floor() + 10';
+ ?column? 
+----------
+ 4
+(1 row)
+
+select json '[1, 2, 3]' @* '($[*] > 2) ? (@ == true)';
+ ?column? 
+----------
+ true
+(1 row)
+
+select json '[1, 2, 3]' @* '($[*] > 3).type()';
+ ?column?  
+-----------
+ "boolean"
+(1 row)
+
+select json '[1, 2, 3]' @* '($[*].a > 3).type()';
+ ?column?  
+-----------
+ "boolean"
+(1 row)
+
+select json '[1, 2, 3]' @* 'strict ($[*].a > 3).type()';
+ ?column? 
+----------
+ "null"
+(1 row)
+
+select json '[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]' @* 'strict $[*].size()';
+ERROR:  SQL/JSON array not found
+select json '[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]' @* 'lax $[*].size()';
+ ?column? 
+----------
+ 1
+ 1
+ 1
+ 1
+ 0
+ 1
+ 3
+ 1
+ 1
+(9 rows)
+
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].abs()';
+ ?column? 
+----------
+ 0
+ 1
+ 2
+ 3.4
+ 5.6
+(5 rows)
+
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].floor()';
+ ?column? 
+----------
+ 0
+ 1
+ -2
+ -4
+ 5
+(5 rows)
+
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].ceiling()';
+ ?column? 
+----------
+ 0
+ 1
+ -2
+ -3
+ 6
+(5 rows)
+
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].ceiling().abs()';
+ ?column? 
+----------
+ 0
+ 1
+ 2
+ 3
+ 6
+(5 rows)
+
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].ceiling().abs().type()';
+ ?column? 
+----------
+ "number"
+ "number"
+ "number"
+ "number"
+ "number"
+(5 rows)
+
+select json '[{},1]' @* '$[*].keyvalue()';
+ERROR:  SQL/JSON object not found
+select json '{}' @* '$.keyvalue()';
+ ?column? 
+----------
+(0 rows)
+
+select json '{"a": 1, "b": [1, 2], "c": {"a": "bbb"}}' @* '$.keyvalue()';
+              ?column?               
+-------------------------------------
+ {"key": "a", "value": 1}
+ {"key": "b", "value": [1, 2]}
+ {"key": "c", "value": {"a": "bbb"}}
+(3 rows)
+
+select json '[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]' @* '$[*].keyvalue()';
+              ?column?               
+-------------------------------------
+ {"key": "a", "value": 1}
+ {"key": "b", "value": [1, 2]}
+ {"key": "c", "value": {"a": "bbb"}}
+(3 rows)
+
+select json '[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]' @* 'strict $.keyvalue()';
+ERROR:  SQL/JSON object not found
+select json '[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]' @* 'lax $.keyvalue()';
+              ?column?               
+-------------------------------------
+ {"key": "a", "value": 1}
+ {"key": "b", "value": [1, 2]}
+ {"key": "c", "value": {"a": "bbb"}}
+(3 rows)
+
+select json 'null' @* '$.double()';
+ERROR:  Non-numeric SQL/JSON item
+select json 'true' @* '$.double()';
+ERROR:  Non-numeric SQL/JSON item
+select json '[]' @* '$.double()';
+ ?column? 
+----------
+(0 rows)
+
+select json '[]' @* 'strict $.double()';
+ERROR:  Non-numeric SQL/JSON item
+select json '{}' @* '$.double()';
+ERROR:  Non-numeric SQL/JSON item
+select json '1.23' @* '$.double()';
+ ?column? 
+----------
+ 1.23
+(1 row)
+
+select json '"1.23"' @* '$.double()';
+ ?column? 
+----------
+ 1.23
+(1 row)
+
+select json '"1.23aaa"' @* '$.double()';
+ERROR:  Non-numeric SQL/JSON item
+select json '["", "a", "abc", "abcabc"]' @* '$[*] ? (@ starts with "abc")';
+ ?column? 
+----------
+ "abc"
+ "abcabc"
+(2 rows)
+
+select json '["", "a", "abc", "abcabc"]' @* 'strict $ ? (@[*] starts with "abc")';
+          ?column?          
+----------------------------
+ ["", "a", "abc", "abcabc"]
+(1 row)
+
+select json '["", "a", "abd", "abdabc"]' @* 'strict $ ? (@[*] starts with "abc")';
+ ?column? 
+----------
+(0 rows)
+
+select json '["abc", "abcabc", null, 1]' @* 'strict $ ? (@[*] starts with "abc")';
+ ?column? 
+----------
+(0 rows)
+
+select json '["abc", "abcabc", null, 1]' @* 'strict $ ? ((@[*] starts with "abc") is unknown)';
+          ?column?          
+----------------------------
+ ["abc", "abcabc", null, 1]
+(1 row)
+
+select json '[[null, 1, "abc", "abcabc"]]' @* 'lax $ ? (@[*] starts with "abc")';
+          ?column?          
+----------------------------
+ [null, 1, "abc", "abcabc"]
+(1 row)
+
+select json '[[null, 1, "abd", "abdabc"]]' @* 'lax $ ? ((@[*] starts with "abc") is unknown)';
+          ?column?          
+----------------------------
+ [null, 1, "abd", "abdabc"]
+(1 row)
+
+select json '[null, 1, "abd", "abdabc"]' @* 'lax $[*] ? ((@ starts with "abc") is unknown)';
+ ?column? 
+----------
+ null
+ 1
+(2 rows)
+
+select json '[null, 1, "abc", "abd", "aBdC", "abdacb", "babc"]' @* 'lax $[*] ? (@ like_regex "^ab.*c")';
+ ?column? 
+----------
+ "abc"
+ "abdacb"
+(2 rows)
+
+select json '[null, 1, "abc", "abd", "aBdC", "abdacb", "babc"]' @* 'lax $[*] ? (@ like_regex "^ab.*c" flag "i")';
+ ?column? 
+----------
+ "abc"
+ "aBdC"
+ "abdacb"
+(3 rows)
+
+select json 'null' @* '$.datetime()';
+ERROR:  Invalid argument for SQL/JSON datetime function
+select json 'true' @* '$.datetime()';
+ERROR:  Invalid argument for SQL/JSON datetime function
+select json '[]' @* '$.datetime()';
+ ?column? 
+----------
+(0 rows)
+
+select json '[]' @* 'strict $.datetime()';
+ERROR:  Invalid argument for SQL/JSON datetime function
+select json '{}' @* '$.datetime()';
+ERROR:  Invalid argument for SQL/JSON datetime function
+select json '""' @* '$.datetime()';
+ERROR:  Invalid argument for SQL/JSON datetime function
+select json '"10-03-2017"' @*       '$.datetime("dd-mm-yyyy")';
+   ?column?   
+--------------
+ "2017-03-10"
+(1 row)
+
+select json '"10-03-2017"' @*       '$.datetime("dd-mm-yyyy").type()';
+ ?column? 
+----------
+ "date"
+(1 row)
+
+select json '"10-03-2017 12:34"' @* '$.datetime("dd-mm-yyyy")';
+   ?column?   
+--------------
+ "2017-03-10"
+(1 row)
+
+select json '"10-03-2017 12:34"' @* '$.datetime("dd-mm-yyyy").type()';
+ ?column? 
+----------
+ "date"
+(1 row)
+
+select json '"10-03-2017 12:34"' @* '       $.datetime("dd-mm-yyyy HH24:MI").type()';
+           ?column?            
+-------------------------------
+ "timestamp without time zone"
+(1 row)
+
+select json '"10-03-2017 12:34 +05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM").type()';
+          ?column?          
+----------------------------
+ "timestamp with time zone"
+(1 row)
+
+select json '"12:34:56"' @*                '$.datetime("HH24:MI:SS").type()';
+         ?column?         
+--------------------------
+ "time without time zone"
+(1 row)
+
+select json '"12:34:56 +05:20"' @*         '$.datetime("HH24:MI:SS TZH:TZM").type()';
+       ?column?        
+-----------------------
+ "time with time zone"
+(1 row)
+
+set time zone '+00';
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI")';
+       ?column?        
+-----------------------
+ "2017-03-10T12:34:00"
+(1 row)
+
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+          ?column?           
+-----------------------------
+ "2017-03-10T12:34:00+00:00"
+(1 row)
+
+select json '"10-03-2017 12:34 +05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+          ?column?           
+-----------------------------
+ "2017-03-10T07:34:00+00:00"
+(1 row)
+
+select json '"10-03-2017 12:34 -05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+          ?column?           
+-----------------------------
+ "2017-03-10T17:34:00+00:00"
+(1 row)
+
+select json '"10-03-2017 12:34 +05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+          ?column?           
+-----------------------------
+ "2017-03-10T07:14:00+00:00"
+(1 row)
+
+select json '"10-03-2017 12:34 -05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+          ?column?           
+-----------------------------
+ "2017-03-10T17:54:00+00:00"
+(1 row)
+
+select json '"12:34"' @*       '$.datetime("HH24:MI")';
+  ?column?  
+------------
+ "12:34:00"
+(1 row)
+
+select json '"12:34"' @*       '$.datetime("HH24:MI TZH")';
+     ?column?     
+------------------
+ "12:34:00+00:00"
+(1 row)
+
+select json '"12:34 +05"' @*    '$.datetime("HH24:MI TZH")';
+     ?column?     
+------------------
+ "12:34:00+05:00"
+(1 row)
+
+select json '"12:34 -05"' @*    '$.datetime("HH24:MI TZH")';
+     ?column?     
+------------------
+ "12:34:00-05:00"
+(1 row)
+
+select json '"12:34 +05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+     ?column?     
+------------------
+ "12:34:00+05:20"
+(1 row)
+
+select json '"12:34 -05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+     ?column?     
+------------------
+ "12:34:00-05:20"
+(1 row)
+
+set time zone '+10';
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI")';
+       ?column?        
+-----------------------
+ "2017-03-10T12:34:00"
+(1 row)
+
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+          ?column?           
+-----------------------------
+ "2017-03-10T12:34:00+10:00"
+(1 row)
+
+select json '"10-03-2017 12:34 +05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+          ?column?           
+-----------------------------
+ "2017-03-10T17:34:00+10:00"
+(1 row)
+
+select json '"10-03-2017 12:34 -05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+          ?column?           
+-----------------------------
+ "2017-03-11T03:34:00+10:00"
+(1 row)
+
+select json '"10-03-2017 12:34 +05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+          ?column?           
+-----------------------------
+ "2017-03-10T17:14:00+10:00"
+(1 row)
+
+select json '"10-03-2017 12:34 -05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+          ?column?           
+-----------------------------
+ "2017-03-11T03:54:00+10:00"
+(1 row)
+
+select json '"12:34"' @*        '$.datetime("HH24:MI")';
+  ?column?  
+------------
+ "12:34:00"
+(1 row)
+
+select json '"12:34"' @*        '$.datetime("HH24:MI TZH")';
+     ?column?     
+------------------
+ "12:34:00+10:00"
+(1 row)
+
+select json '"12:34 +05"' @*    '$.datetime("HH24:MI TZH")';
+     ?column?     
+------------------
+ "12:34:00+05:00"
+(1 row)
+
+select json '"12:34 -05"' @*    '$.datetime("HH24:MI TZH")';
+     ?column?     
+------------------
+ "12:34:00-05:00"
+(1 row)
+
+select json '"12:34 +05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+     ?column?     
+------------------
+ "12:34:00+05:20"
+(1 row)
+
+select json '"12:34 -05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+     ?column?     
+------------------
+ "12:34:00-05:20"
+(1 row)
+
+set time zone default;
+select json '"2017-03-10"' @* '$.datetime().type()';
+ ?column? 
+----------
+ "date"
+(1 row)
+
+select json '"2017-03-10"' @* '$.datetime()';
+   ?column?   
+--------------
+ "2017-03-10"
+(1 row)
+
+select json '"2017-03-10 12:34:56"' @* '$.datetime().type()';
+           ?column?            
+-------------------------------
+ "timestamp without time zone"
+(1 row)
+
+select json '"2017-03-10 12:34:56"' @* '$.datetime()';
+       ?column?        
+-----------------------
+ "2017-03-10T12:34:56"
+(1 row)
+
+select json '"2017-03-10 12:34:56 +3"' @* '$.datetime().type()';
+          ?column?          
+----------------------------
+ "timestamp with time zone"
+(1 row)
+
+select json '"2017-03-10 12:34:56 +3"' @* '$.datetime()';
+          ?column?           
+-----------------------------
+ "2017-03-10T01:34:56-08:00"
+(1 row)
+
+select json '"2017-03-10 12:34:56 +3:10"' @* '$.datetime().type()';
+          ?column?          
+----------------------------
+ "timestamp with time zone"
+(1 row)
+
+select json '"2017-03-10 12:34:56 +3:10"' @* '$.datetime()';
+          ?column?           
+-----------------------------
+ "2017-03-10T01:24:56-08:00"
+(1 row)
+
+select json '"12:34:56"' @* '$.datetime().type()';
+         ?column?         
+--------------------------
+ "time without time zone"
+(1 row)
+
+select json '"12:34:56"' @* '$.datetime()';
+  ?column?  
+------------
+ "12:34:56"
+(1 row)
+
+select json '"12:34:56 +3"' @* '$.datetime().type()';
+       ?column?        
+-----------------------
+ "time with time zone"
+(1 row)
+
+select json '"12:34:56 +3"' @* '$.datetime()';
+     ?column?     
+------------------
+ "12:34:56+03:00"
+(1 row)
+
+select json '"12:34:56 +3:10"' @* '$.datetime().type()';
+       ?column?        
+-----------------------
+ "time with time zone"
+(1 row)
+
+select json '"12:34:56 +3:10"' @* '$.datetime()';
+     ?column?     
+------------------
+ "12:34:56+03:10"
+(1 row)
+
+set time zone '+00';
+-- date comparison
+select json '["2017-03-10", "2017-03-11", "2017-03-09", "12:34:56", "01:02:03 +04", "2017-03-10 00:00:00", "2017-03-10 12:34:56", "2017-03-10 01:02:03 +04", "2017-03-10 03:00:00 +03"]'
+	@* '$[*].datetime() ? (@ == "10.03.2017".datetime("dd.mm.yyyy"))';
+          ?column?           
+-----------------------------
+ "2017-03-10"
+ "2017-03-10T00:00:00"
+ "2017-03-10T00:00:00+00:00"
+(3 rows)
+
+select json '["2017-03-10", "2017-03-11", "2017-03-09", "12:34:56", "01:02:03 +04", "2017-03-10 00:00:00", "2017-03-10 12:34:56", "2017-03-10 01:02:03 +04", "2017-03-10 03:00:00 +03"]'
+	@* '$[*].datetime() ? (@ >= "10.03.2017".datetime("dd.mm.yyyy"))';
+          ?column?           
+-----------------------------
+ "2017-03-10"
+ "2017-03-11"
+ "2017-03-10T00:00:00"
+ "2017-03-10T12:34:56"
+ "2017-03-10T00:00:00+00:00"
+(5 rows)
+
+select json '["2017-03-10", "2017-03-11", "2017-03-09", "12:34:56", "01:02:03 +04", "2017-03-10 00:00:00", "2017-03-10 12:34:56", "2017-03-10 01:02:03 +04", "2017-03-10 03:00:00 +03"]'
+	@* '$[*].datetime() ? (@ <  "10.03.2017".datetime("dd.mm.yyyy"))';
+          ?column?           
+-----------------------------
+ "2017-03-09"
+ "2017-03-09T21:02:03+00:00"
+(2 rows)
+
+-- time comparison
+select json '["12:34:00", "12:35:00", "12:36:00", "12:35:00 +00", "12:35:00 +01", "13:35:00 +01", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +01"]'
+	@* '$[*].datetime() ? (@ == "12:35".datetime("HH24:MI"))';
+     ?column?     
+------------------
+ "12:35:00"
+ "12:35:00+00:00"
+(2 rows)
+
+select json '["12:34:00", "12:35:00", "12:36:00", "12:35:00 +00", "12:35:00 +01", "13:35:00 +01", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +01"]'
+	@* '$[*].datetime() ? (@ >= "12:35".datetime("HH24:MI"))';
+     ?column?     
+------------------
+ "12:35:00"
+ "12:36:00"
+ "12:35:00+00:00"
+(3 rows)
+
+select json '["12:34:00", "12:35:00", "12:36:00", "12:35:00 +00", "12:35:00 +01", "13:35:00 +01", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +01"]'
+	@* '$[*].datetime() ? (@ <  "12:35".datetime("HH24:MI"))';
+     ?column?     
+------------------
+ "12:34:00"
+ "12:35:00+01:00"
+ "13:35:00+01:00"
+(3 rows)
+
+-- timetz comparison
+select json '["12:34:00 +01", "12:35:00 +01", "12:36:00 +01", "12:35:00 +02", "12:35:00 -02", "10:35:00", "11:35:00", "12:35:00", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +1"]'
+	@* '$[*].datetime() ? (@ == "12:35 +1".datetime("HH24:MI TZH"))';
+     ?column?     
+------------------
+ "12:35:00+01:00"
+(1 row)
+
+select json '["12:34:00 +01", "12:35:00 +01", "12:36:00 +01", "12:35:00 +02", "12:35:00 -02", "10:35:00", "11:35:00", "12:35:00", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +1"]'
+	@* '$[*].datetime() ? (@ >= "12:35 +1".datetime("HH24:MI TZH"))';
+     ?column?     
+------------------
+ "12:35:00+01:00"
+ "12:36:00+01:00"
+ "12:35:00-02:00"
+ "11:35:00"
+ "12:35:00"
+(5 rows)
+
+select json '["12:34:00 +01", "12:35:00 +01", "12:36:00 +01", "12:35:00 +02", "12:35:00 -02", "10:35:00", "11:35:00", "12:35:00", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +1"]'
+	@* '$[*].datetime() ? (@ <  "12:35 +1".datetime("HH24:MI TZH"))';
+     ?column?     
+------------------
+ "12:34:00+01:00"
+ "12:35:00+02:00"
+ "10:35:00"
+(3 rows)
+
+-- timestamp comparison
+select json '["2017-03-10 12:34:00", "2017-03-10 12:35:00", "2017-03-10 12:36:00", "2017-03-10 12:35:00 +01", "2017-03-10 13:35:00 +01", "2017-03-10 12:35:00 -01", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ == "10.03.2017 12:35".datetime("dd.mm.yyyy HH24:MI"))';
+          ?column?           
+-----------------------------
+ "2017-03-10T12:35:00"
+ "2017-03-10T12:35:00+00:00"
+(2 rows)
+
+select json '["2017-03-10 12:34:00", "2017-03-10 12:35:00", "2017-03-10 12:36:00", "2017-03-10 12:35:00 +01", "2017-03-10 13:35:00 +01", "2017-03-10 12:35:00 -01", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ >= "10.03.2017 12:35".datetime("dd.mm.yyyy HH24:MI"))';
+          ?column?           
+-----------------------------
+ "2017-03-10T12:35:00"
+ "2017-03-10T12:36:00"
+ "2017-03-10T12:35:00+00:00"
+ "2017-03-10T13:35:00+00:00"
+ "2017-03-11"
+(5 rows)
+
+select json '["2017-03-10 12:34:00", "2017-03-10 12:35:00", "2017-03-10 12:36:00", "2017-03-10 12:35:00 +01", "2017-03-10 13:35:00 +01", "2017-03-10 12:35:00 -01", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ < "10.03.2017 12:35".datetime("dd.mm.yyyy HH24:MI"))';
+          ?column?           
+-----------------------------
+ "2017-03-10T12:34:00"
+ "2017-03-10T11:35:00+00:00"
+ "2017-03-10"
+(3 rows)
+
+-- timestamptz comparison
+select json '["2017-03-10 12:34:00 +01", "2017-03-10 12:35:00 +01", "2017-03-10 12:36:00 +01", "2017-03-10 12:35:00 +02", "2017-03-10 12:35:00 -02", "2017-03-10 10:35:00", "2017-03-10 11:35:00", "2017-03-10 12:35:00", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ == "10.03.2017 12:35 +1".datetime("dd.mm.yyyy HH24:MI TZH"))';
+          ?column?           
+-----------------------------
+ "2017-03-10T11:35:00+00:00"
+ "2017-03-10T11:35:00"
+(2 rows)
+
+select json '["2017-03-10 12:34:00 +01", "2017-03-10 12:35:00 +01", "2017-03-10 12:36:00 +01", "2017-03-10 12:35:00 +02", "2017-03-10 12:35:00 -02", "2017-03-10 10:35:00", "2017-03-10 11:35:00", "2017-03-10 12:35:00", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ >= "10.03.2017 12:35 +1".datetime("dd.mm.yyyy HH24:MI TZH"))';
+          ?column?           
+-----------------------------
+ "2017-03-10T11:35:00+00:00"
+ "2017-03-10T11:36:00+00:00"
+ "2017-03-10T14:35:00+00:00"
+ "2017-03-10T11:35:00"
+ "2017-03-10T12:35:00"
+ "2017-03-11"
+(6 rows)
+
+select json '["2017-03-10 12:34:00 +01", "2017-03-10 12:35:00 +01", "2017-03-10 12:36:00 +01", "2017-03-10 12:35:00 +02", "2017-03-10 12:35:00 -02", "2017-03-10 10:35:00", "2017-03-10 11:35:00", "2017-03-10 12:35:00", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ < "10.03.2017 12:35 +1".datetime("dd.mm.yyyy HH24:MI TZH"))';
+          ?column?           
+-----------------------------
+ "2017-03-10T11:34:00+00:00"
+ "2017-03-10T10:35:00+00:00"
+ "2017-03-10T10:35:00"
+ "2017-03-10"
+(4 rows)
+
+set time zone default;
+-- jsonpath operators
+SELECT json '[{"a": 1}, {"a": 2}]' @* '$[*]';
+ ?column? 
+----------
+ {"a": 1}
+ {"a": 2}
+(2 rows)
+
+SELECT json '[{"a": 1}, {"a": 2}]' @* '$[*] ? (@.a > 10)';
+ ?column? 
+----------
+(0 rows)
+
+SELECT json '[{"a": 1}, {"a": 2}]' @? '$[*] ? (@.a > 1)';
+ ?column? 
+----------
+ t
+(1 row)
+
+SELECT json '[{"a": 1}, {"a": 2}]' @? '$[*].a ? (@ > 2)';
+ ?column? 
+----------
+ f
+(1 row)
+
+SELECT json '[{"a": 1}, {"a": 2}]' @~ '$[*].a > 1';
+ ?column? 
+----------
+ t
+(1 row)
+
+SELECT json '[{"a": 1}, {"a": 2}]' @~ '$[*].a > 2';
+ ?column? 
+----------
+ f
+(1 row)
+
diff --git a/src/test/regress/parallel_schedule b/src/test/regress/parallel_schedule
index 096d32d..4ad1e95 100644
--- a/src/test/regress/parallel_schedule
+++ b/src/test/regress/parallel_schedule
@@ -109,7 +109,7 @@ test: select_views portals_p2 foreign_key cluster dependency guc bitmapops combo
 # ----------
 # Another group of parallel tests (JSON related)
 # ----------
-test: json jsonb json_encoding jsonpath jsonb_jsonpath
+test: json jsonb json_encoding jsonpath json_jsonpath jsonb_jsonpath
 
 # ----------
 # Another group of parallel tests
diff --git a/src/test/regress/serial_schedule b/src/test/regress/serial_schedule
index 3c4c4a6..86d445e 100644
--- a/src/test/regress/serial_schedule
+++ b/src/test/regress/serial_schedule
@@ -159,6 +159,7 @@ test: json
 test: jsonb
 test: json_encoding
 test: jsonpath
+test: json_jsonpath
 test: jsonb_jsonpath
 test: indirect_toast
 test: equivclass
diff --git a/src/test/regress/sql/json_jsonpath.sql b/src/test/regress/sql/json_jsonpath.sql
new file mode 100644
index 0000000..fe35741
--- /dev/null
+++ b/src/test/regress/sql/json_jsonpath.sql
@@ -0,0 +1,359 @@
+select json '{"a": 12}' @? '$.a.b';
+select json '{"a": 12}' @? '$.b';
+select json '{"a": {"a": 12}}' @? '$.a.a';
+select json '{"a": {"a": 12}}' @? '$.*.a';
+select json '{"b": {"a": 12}}' @? '$.*.a';
+select json '{}' @? '$.*';
+select json '{"a": 1}' @? '$.*';
+select json '{"a": {"b": 1}}' @? 'lax $.**{1}';
+select json '{"a": {"b": 1}}' @? 'lax $.**{2}';
+select json '{"a": {"b": 1}}' @? 'lax $.**{3}';
+select json '[]' @? '$.[*]';
+select json '[1]' @? '$.[*]';
+select json '[1]' @? '$.[1]';
+select json '[1]' @? 'strict $.[1]';
+select json '[1]' @? '$.[0]';
+select json '[1]' @? '$.[0.3]';
+select json '[1]' @? '$.[0.5]';
+select json '[1]' @? '$.[0.9]';
+select json '[1]' @? '$.[1.2]';
+select json '[1]' @? 'strict $.[1.2]';
+select json '{}' @? 'strict $.[0.3]';
+select json '{}' @? 'lax $.[0.3]';
+select json '{}' @? 'strict $.[1.2]';
+select json '{}' @? 'lax $.[1.2]';
+select json '{}' @? 'strict $.[-2 to 3]';
+select json '{}' @? 'lax $.[-2 to 3]';
+
+select json '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >  @.b[*])';
+select json '{"a": [1,2,3], "b": [3,4,5]}' @? '$ ? (@.a[*] >= @.b[*])';
+select json '{"a": [1,2,3], "b": [3,4,"5"]}' @? '$ ? (@.a[*] >= @.b[*])';
+select json '{"a": [1,2,3], "b": [3,4,"5"]}' @? 'strict $ ? (@.a[*] >= @.b[*])';
+select json '{"a": [1,2,3], "b": [3,4,null]}' @? '$ ? (@.a[*] >= @.b[*])';
+select json '1' @? '$ ? ((@ == "1") is unknown)';
+select json '1' @? '$ ? ((@ == 1) is unknown)';
+select json '[{"a": 1}, {"a": 2}]' @? '$[0 to 1] ? (@.a > 1)';
+
+select json '{"a": 12, "b": {"a": 13}}' @* '$.a';
+select json '{"a": 12, "b": {"a": 13}}' @* '$.b';
+select json '{"a": 12, "b": {"a": 13}}' @* '$.*';
+select json '{"a": 12, "b": {"a": 13}}' @* 'lax $.*.a';
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[*].a';
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[*].*';
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[0].a';
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[1].a';
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[2].a';
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[0,1].a';
+select json '[12, {"a": 13}, {"b": 14}]' @* 'lax $.[0 to 10].a';
+select json '[12, {"a": 13}, {"b": 14}, "ccc", true]' @* '$.[2.5 - 1 to @.size() - 2]';
+select json '1' @* 'lax $[0]';
+select json '1' @* 'lax $[*]';
+select json '{}' @* 'lax $[0]';
+select json '[1]' @* 'lax $[0]';
+select json '[1]' @* 'lax $[*]';
+select json '[1,2,3]' @* 'lax $[*]';
+select json '[]' @* '$[last]';
+select json '[]' @* 'strict $[last]';
+select json '[1]' @* '$[last]';
+select json '{}' @* 'lax $[last]';
+select json '[1,2,3]' @* '$[last]';
+select json '[1,2,3]' @* '$[last - 1]';
+select json '[1,2,3]' @* '$[last ? (@.type() == "number")]';
+select json '[1,2,3]' @* '$[last ? (@.type() == "string")]';
+
+select * from jsonpath_query(json '{"a": 10}', '$');
+select * from jsonpath_query(json '{"a": 10}', '$ ? (.a < $value)');
+select * from jsonpath_query(json '{"a": 10}', '$ ? (.a < $value)', '{"value" : 13}');
+select * from jsonpath_query(json '{"a": 10}', '$ ? (.a < $value)', '{"value" : 8}');
+select * from jsonpath_query(json '{"a": 10}', '$.a ? (@ < $value)', '{"value" : 13}');
+select * from jsonpath_query(json '[10,11,12,13,14,15]', '$.[*] ? (@ < $value)', '{"value" : 13}');
+select * from jsonpath_query(json '[10,11,12,13,14,15]', '$.[0,1] ? (@ < $value)', '{"value" : 13}');
+select * from jsonpath_query(json '[10,11,12,13,14,15]', '$.[0 to 2] ? (@ < $value)', '{"value" : 15}');
+select * from jsonpath_query(json '[1,"1",2,"2",null]', '$.[*] ? (@ == "1")');
+select * from jsonpath_query(json '[1,"1",2,"2",null]', '$.[*] ? (@ == $value)', '{"value" : "1"}');
+select json '[1, "2", null]' @* '$[*] ? (@ != null)';
+select json '[1, "2", null]' @* '$[*] ? (@ == null)';
+
+select json '{"a": {"b": 1}}' @* 'lax $.**';
+select json '{"a": {"b": 1}}' @* 'lax $.**{1}';
+select json '{"a": {"b": 1}}' @* 'lax $.**{1,}';
+select json '{"a": {"b": 1}}' @* 'lax $.**{2}';
+select json '{"a": {"b": 1}}' @* 'lax $.**{2,}';
+select json '{"a": {"b": 1}}' @* 'lax $.**{3,}';
+select json '{"a": {"b": 1}}' @* 'lax $.**.b ? (@ > 0)';
+select json '{"a": {"b": 1}}' @* 'lax $.**{0}.b ? (@ > 0)';
+select json '{"a": {"b": 1}}' @* 'lax $.**{1}.b ? (@ > 0)';
+select json '{"a": {"b": 1}}' @* 'lax $.**{0,}.b ? (@ > 0)';
+select json '{"a": {"b": 1}}' @* 'lax $.**{1,}.b ? (@ > 0)';
+select json '{"a": {"b": 1}}' @* 'lax $.**{1,2}.b ? (@ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**.b ? (@ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{0}.b ? (@ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{1}.b ? (@ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{0,}.b ? (@ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{1,}.b ? (@ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{1,2}.b ? (@ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @* 'lax $.**{2,3}.b ? (@ > 0)';
+
+select json '{"a": {"b": 1}}' @? '$.**.b ? ( @ > 0)';
+select json '{"a": {"b": 1}}' @? '$.**{0}.b ? ( @ > 0)';
+select json '{"a": {"b": 1}}' @? '$.**{1}.b ? ( @ > 0)';
+select json '{"a": {"b": 1}}' @? '$.**{0,}.b ? ( @ > 0)';
+select json '{"a": {"b": 1}}' @? '$.**{1,}.b ? ( @ > 0)';
+select json '{"a": {"b": 1}}' @? '$.**{1,2}.b ? ( @ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @? '$.**.b ? ( @ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{0}.b ? ( @ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{1}.b ? ( @ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{0,}.b ? ( @ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{1,}.b ? ( @ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{1,2}.b ? ( @ > 0)';
+select json '{"a": {"c": {"b": 1}}}' @? '$.**{2,3}.b ? ( @ > 0)';
+
+select json '{"g": {"x": 2}}' @* '$.g ? (exists (@.x))';
+select json '{"g": {"x": 2}}' @* '$.g ? (exists (@.y))';
+select json '{"g": {"x": 2}}' @* '$.g ? (exists (@.x ? (@ >= 2) ))';
+
+--test ternary logic
+select
+	x, y,
+	jsonpath_query(
+		json '[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true && $y == true) ||
+				 @ == false && !($x == true && $y == true) ||
+				 @ == null  &&  ($x == true && $y == true) is unknown)',
+		json_build_object('x', x, 'y', y)
+	) as "x && y"
+from
+	(values (json 'true'), ('false'), ('"null"')) x(x),
+	(values (json 'true'), ('false'), ('"null"')) y(y);
+
+select
+	x, y,
+	jsonpath_query(
+		json '[true, false, null]',
+		'$[*] ? (@ == true  &&  ($x == true || $y == true) ||
+				 @ == false && !($x == true || $y == true) ||
+				 @ == null  &&  ($x == true || $y == true) is unknown)',
+		json_build_object('x', x, 'y', y)
+	) as "x || y"
+from
+	(values (json 'true'), ('false'), ('"null"')) x(x),
+	(values (json 'true'), ('false'), ('"null"')) y(y);
+
+select json '{"a": 1, "b": 1}' @? '$ ? (.a == .b)';
+select json '{"c": {"a": 1, "b": 1}}' @? '$ ? (.a == .b)';
+select json '{"c": {"a": 1, "b": 1}}' @? '$.c ? (.a == .b)';
+select json '{"c": {"a": 1, "b": 1}}' @? '$.c ? ($.c.a == .b)';
+select json '{"c": {"a": 1, "b": 1}}' @? '$.* ? (.a == .b)';
+select json '{"a": 1, "b": 1}' @? '$.** ? (.a == .b)';
+select json '{"c": {"a": 1, "b": 1}}' @? '$.** ? (.a == .b)';
+
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == 1 + 1)';
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == (1 + 1))';
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == .b + 1)';
+select json '{"c": {"a": 2, "b": 1}}' @* '$.** ? (.a == (.b + 1))';
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == - 1)';
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == -1)';
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == -.b)';
+select json '{"c": {"a": -1, "b": 1}}' @? '$.** ? (.a == - .b)';
+select json '{"c": {"a": 0, "b": 1}}' @? '$.** ? (.a == 1 - .b)';
+select json '{"c": {"a": 2, "b": 1}}' @? '$.** ? (.a == 1 - - .b)';
+select json '{"c": {"a": 0, "b": 1}}' @? '$.** ? (.a == 1 - +.b)';
+select json '[1,2,3]' @? '$ ? (+@[*] > +2)';
+select json '[1,2,3]' @? '$ ? (+@[*] > +3)';
+select json '[1,2,3]' @? '$ ? (-@[*] < -2)';
+select json '[1,2,3]' @? '$ ? (-@[*] < -3)';
+select json '1' @? '$ ? ($ > 0)';
+
+-- unwrapping of operator arguments in lax mode
+select json '{"a": [2]}' @* 'lax $.a * 3';
+select json '{"a": [2]}' @* 'lax $.a + 3';
+select json '{"a": [2, 3, 4]}' @* 'lax -$.a';
+-- should fail
+select json '{"a": [1, 2]}' @* 'lax $.a * 3';
+
+-- extension: boolean expressions
+select json '2' @* '$ > 1';
+select json '2' @* '$ <= 1';
+select json '2' @* '$ == "2"';
+
+select json '2' @~ '$ > 1';
+select json '2' @~ '$ <= 1';
+select json '2' @~ '$ == "2"';
+select json '2' @~ '1';
+select json '{}' @~ '$';
+select json '[]' @~ '$';
+select json '[1,2,3]' @~ '$[*]';
+select json '[]' @~ '$[*]';
+select jsonpath_predicate(json '[[1, true], [2, false]]', 'strict $[*] ? (@[0] > $x) [1]', '{"x": 1}');
+select jsonpath_predicate(json '[[1, true], [2, false]]', 'strict $[*] ? (@[0] < $x) [1]', '{"x": 2}');
+
+select json '[null,1,true,"a",[],{}]' @* '$.type()';
+select json '[null,1,true,"a",[],{}]' @* 'lax $.type()';
+select json '[null,1,true,"a",[],{}]' @* '$[*].type()';
+select json 'null' @* 'null.type()';
+select json 'null' @* 'true.type()';
+select json 'null' @* '123.type()';
+select json 'null' @* '"123".type()';
+
+select json '{"a": 2}' @* '($.a - 5).abs() + 10';
+select json '{"a": 2.5}' @* '-($.a * $.a).floor() + 10';
+select json '[1, 2, 3]' @* '($[*] > 2) ? (@ == true)';
+select json '[1, 2, 3]' @* '($[*] > 3).type()';
+select json '[1, 2, 3]' @* '($[*].a > 3).type()';
+select json '[1, 2, 3]' @* 'strict ($[*].a > 3).type()';
+
+select json '[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]' @* 'strict $[*].size()';
+select json '[1,null,true,"11",[],[1],[1,2,3],{},{"a":1,"b":2}]' @* 'lax $[*].size()';
+
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].abs()';
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].floor()';
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].ceiling()';
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].ceiling().abs()';
+select json '[0, 1, -2, -3.4, 5.6]' @* '$[*].ceiling().abs().type()';
+
+select json '[{},1]' @* '$[*].keyvalue()';
+select json '{}' @* '$.keyvalue()';
+select json '{"a": 1, "b": [1, 2], "c": {"a": "bbb"}}' @* '$.keyvalue()';
+select json '[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]' @* '$[*].keyvalue()';
+select json '[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]' @* 'strict $.keyvalue()';
+select json '[{"a": 1, "b": [1, 2]}, {"c": {"a": "bbb"}}]' @* 'lax $.keyvalue()';
+
+select json 'null' @* '$.double()';
+select json 'true' @* '$.double()';
+select json '[]' @* '$.double()';
+select json '[]' @* 'strict $.double()';
+select json '{}' @* '$.double()';
+select json '1.23' @* '$.double()';
+select json '"1.23"' @* '$.double()';
+select json '"1.23aaa"' @* '$.double()';
+
+select json '["", "a", "abc", "abcabc"]' @* '$[*] ? (@ starts with "abc")';
+select json '["", "a", "abc", "abcabc"]' @* 'strict $ ? (@[*] starts with "abc")';
+select json '["", "a", "abd", "abdabc"]' @* 'strict $ ? (@[*] starts with "abc")';
+select json '["abc", "abcabc", null, 1]' @* 'strict $ ? (@[*] starts with "abc")';
+select json '["abc", "abcabc", null, 1]' @* 'strict $ ? ((@[*] starts with "abc") is unknown)';
+select json '[[null, 1, "abc", "abcabc"]]' @* 'lax $ ? (@[*] starts with "abc")';
+select json '[[null, 1, "abd", "abdabc"]]' @* 'lax $ ? ((@[*] starts with "abc") is unknown)';
+select json '[null, 1, "abd", "abdabc"]' @* 'lax $[*] ? ((@ starts with "abc") is unknown)';
+
+select json '[null, 1, "abc", "abd", "aBdC", "abdacb", "babc"]' @* 'lax $[*] ? (@ like_regex "^ab.*c")';
+select json '[null, 1, "abc", "abd", "aBdC", "abdacb", "babc"]' @* 'lax $[*] ? (@ like_regex "^ab.*c" flag "i")';
+
+select json 'null' @* '$.datetime()';
+select json 'true' @* '$.datetime()';
+select json '[]' @* '$.datetime()';
+select json '[]' @* 'strict $.datetime()';
+select json '{}' @* '$.datetime()';
+select json '""' @* '$.datetime()';
+
+select json '"10-03-2017"' @*       '$.datetime("dd-mm-yyyy")';
+select json '"10-03-2017"' @*       '$.datetime("dd-mm-yyyy").type()';
+select json '"10-03-2017 12:34"' @* '$.datetime("dd-mm-yyyy")';
+select json '"10-03-2017 12:34"' @* '$.datetime("dd-mm-yyyy").type()';
+
+select json '"10-03-2017 12:34"' @* '       $.datetime("dd-mm-yyyy HH24:MI").type()';
+select json '"10-03-2017 12:34 +05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM").type()';
+select json '"12:34:56"' @*                '$.datetime("HH24:MI:SS").type()';
+select json '"12:34:56 +05:20"' @*         '$.datetime("HH24:MI:SS TZH:TZM").type()';
+
+set time zone '+00';
+
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI")';
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+select json '"10-03-2017 12:34 +05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+select json '"10-03-2017 12:34 -05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+select json '"10-03-2017 12:34 +05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+select json '"10-03-2017 12:34 -05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+select json '"12:34"' @*       '$.datetime("HH24:MI")';
+select json '"12:34"' @*       '$.datetime("HH24:MI TZH")';
+select json '"12:34 +05"' @*    '$.datetime("HH24:MI TZH")';
+select json '"12:34 -05"' @*    '$.datetime("HH24:MI TZH")';
+select json '"12:34 +05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+select json '"12:34 -05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+
+set time zone '+10';
+
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI")';
+select json '"10-03-2017 12:34"' @*        '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+select json '"10-03-2017 12:34 +05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+select json '"10-03-2017 12:34 -05"' @*    '$.datetime("dd-mm-yyyy HH24:MI TZH")';
+select json '"10-03-2017 12:34 +05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+select json '"10-03-2017 12:34 -05:20"' @* '$.datetime("dd-mm-yyyy HH24:MI TZH:TZM")';
+select json '"12:34"' @*        '$.datetime("HH24:MI")';
+select json '"12:34"' @*        '$.datetime("HH24:MI TZH")';
+select json '"12:34 +05"' @*    '$.datetime("HH24:MI TZH")';
+select json '"12:34 -05"' @*    '$.datetime("HH24:MI TZH")';
+select json '"12:34 +05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+select json '"12:34 -05:20"' @* '$.datetime("HH24:MI TZH:TZM")';
+
+set time zone default;
+
+select json '"2017-03-10"' @* '$.datetime().type()';
+select json '"2017-03-10"' @* '$.datetime()';
+select json '"2017-03-10 12:34:56"' @* '$.datetime().type()';
+select json '"2017-03-10 12:34:56"' @* '$.datetime()';
+select json '"2017-03-10 12:34:56 +3"' @* '$.datetime().type()';
+select json '"2017-03-10 12:34:56 +3"' @* '$.datetime()';
+select json '"2017-03-10 12:34:56 +3:10"' @* '$.datetime().type()';
+select json '"2017-03-10 12:34:56 +3:10"' @* '$.datetime()';
+select json '"12:34:56"' @* '$.datetime().type()';
+select json '"12:34:56"' @* '$.datetime()';
+select json '"12:34:56 +3"' @* '$.datetime().type()';
+select json '"12:34:56 +3"' @* '$.datetime()';
+select json '"12:34:56 +3:10"' @* '$.datetime().type()';
+select json '"12:34:56 +3:10"' @* '$.datetime()';
+
+set time zone '+00';
+
+-- date comparison
+select json '["2017-03-10", "2017-03-11", "2017-03-09", "12:34:56", "01:02:03 +04", "2017-03-10 00:00:00", "2017-03-10 12:34:56", "2017-03-10 01:02:03 +04", "2017-03-10 03:00:00 +03"]'
+	@* '$[*].datetime() ? (@ == "10.03.2017".datetime("dd.mm.yyyy"))';
+select json '["2017-03-10", "2017-03-11", "2017-03-09", "12:34:56", "01:02:03 +04", "2017-03-10 00:00:00", "2017-03-10 12:34:56", "2017-03-10 01:02:03 +04", "2017-03-10 03:00:00 +03"]'
+	@* '$[*].datetime() ? (@ >= "10.03.2017".datetime("dd.mm.yyyy"))';
+select json '["2017-03-10", "2017-03-11", "2017-03-09", "12:34:56", "01:02:03 +04", "2017-03-10 00:00:00", "2017-03-10 12:34:56", "2017-03-10 01:02:03 +04", "2017-03-10 03:00:00 +03"]'
+	@* '$[*].datetime() ? (@ <  "10.03.2017".datetime("dd.mm.yyyy"))';
+
+-- time comparison
+select json '["12:34:00", "12:35:00", "12:36:00", "12:35:00 +00", "12:35:00 +01", "13:35:00 +01", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +01"]'
+	@* '$[*].datetime() ? (@ == "12:35".datetime("HH24:MI"))';
+select json '["12:34:00", "12:35:00", "12:36:00", "12:35:00 +00", "12:35:00 +01", "13:35:00 +01", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +01"]'
+	@* '$[*].datetime() ? (@ >= "12:35".datetime("HH24:MI"))';
+select json '["12:34:00", "12:35:00", "12:36:00", "12:35:00 +00", "12:35:00 +01", "13:35:00 +01", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +01"]'
+	@* '$[*].datetime() ? (@ <  "12:35".datetime("HH24:MI"))';
+
+-- timetz comparison
+select json '["12:34:00 +01", "12:35:00 +01", "12:36:00 +01", "12:35:00 +02", "12:35:00 -02", "10:35:00", "11:35:00", "12:35:00", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +1"]'
+	@* '$[*].datetime() ? (@ == "12:35 +1".datetime("HH24:MI TZH"))';
+select json '["12:34:00 +01", "12:35:00 +01", "12:36:00 +01", "12:35:00 +02", "12:35:00 -02", "10:35:00", "11:35:00", "12:35:00", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +1"]'
+	@* '$[*].datetime() ? (@ >= "12:35 +1".datetime("HH24:MI TZH"))';
+select json '["12:34:00 +01", "12:35:00 +01", "12:36:00 +01", "12:35:00 +02", "12:35:00 -02", "10:35:00", "11:35:00", "12:35:00", "2017-03-10", "2017-03-10 12:35:00", "2017-03-10 12:35:00 +1"]'
+	@* '$[*].datetime() ? (@ <  "12:35 +1".datetime("HH24:MI TZH"))';
+
+-- timestamp comparison
+select json '["2017-03-10 12:34:00", "2017-03-10 12:35:00", "2017-03-10 12:36:00", "2017-03-10 12:35:00 +01", "2017-03-10 13:35:00 +01", "2017-03-10 12:35:00 -01", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ == "10.03.2017 12:35".datetime("dd.mm.yyyy HH24:MI"))';
+select json '["2017-03-10 12:34:00", "2017-03-10 12:35:00", "2017-03-10 12:36:00", "2017-03-10 12:35:00 +01", "2017-03-10 13:35:00 +01", "2017-03-10 12:35:00 -01", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ >= "10.03.2017 12:35".datetime("dd.mm.yyyy HH24:MI"))';
+select json '["2017-03-10 12:34:00", "2017-03-10 12:35:00", "2017-03-10 12:36:00", "2017-03-10 12:35:00 +01", "2017-03-10 13:35:00 +01", "2017-03-10 12:35:00 -01", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ < "10.03.2017 12:35".datetime("dd.mm.yyyy HH24:MI"))';
+
+-- timestamptz comparison
+select json '["2017-03-10 12:34:00 +01", "2017-03-10 12:35:00 +01", "2017-03-10 12:36:00 +01", "2017-03-10 12:35:00 +02", "2017-03-10 12:35:00 -02", "2017-03-10 10:35:00", "2017-03-10 11:35:00", "2017-03-10 12:35:00", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ == "10.03.2017 12:35 +1".datetime("dd.mm.yyyy HH24:MI TZH"))';
+select json '["2017-03-10 12:34:00 +01", "2017-03-10 12:35:00 +01", "2017-03-10 12:36:00 +01", "2017-03-10 12:35:00 +02", "2017-03-10 12:35:00 -02", "2017-03-10 10:35:00", "2017-03-10 11:35:00", "2017-03-10 12:35:00", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ >= "10.03.2017 12:35 +1".datetime("dd.mm.yyyy HH24:MI TZH"))';
+select json '["2017-03-10 12:34:00 +01", "2017-03-10 12:35:00 +01", "2017-03-10 12:36:00 +01", "2017-03-10 12:35:00 +02", "2017-03-10 12:35:00 -02", "2017-03-10 10:35:00", "2017-03-10 11:35:00", "2017-03-10 12:35:00", "2017-03-10", "2017-03-11", "12:34:56", "12:34:56 +01"]'
+	@* '$[*].datetime() ? (@ < "10.03.2017 12:35 +1".datetime("dd.mm.yyyy HH24:MI TZH"))';
+
+set time zone default;
+
+-- jsonpath operators
+
+SELECT json '[{"a": 1}, {"a": 2}]' @* '$[*]';
+SELECT json '[{"a": 1}, {"a": 2}]' @* '$[*] ? (@.a > 10)';
+
+SELECT json '[{"a": 1}, {"a": 2}]' @? '$[*] ? (@.a > 1)';
+SELECT json '[{"a": 1}, {"a": 2}]' @? '$[*].a ? (@ > 2)';
+
+SELECT json '[{"a": 1}, {"a": 2}]' @~ '$[*].a > 1';
+SELECT json '[{"a": 1}, {"a": 2}]' @~ '$[*].a > 2';