From e16de8df629c3b2987e6c136ae0424b03e072534 Mon Sep 17 00:00:00 2001 From: Andrew Dunstan Date: Thu, 16 Mar 2023 17:53:51 -0400 Subject: [PATCH v13 1/3] IS JSON predicate This patch intrdocuces the SQL standard IS JSON predicate. It operates on text and bytea values representing JSON as well as on the json and jsonb types. Each test has an IS and IS NOT variant. The tests are: IS JSON [VALUE] IS JSON ARRAY IS JSON OBJECT IS JSON SCALAR IS JSON WITH | WITHOUT UNIQUE KEYS These are mostly self-explanatory, but note that IS JSON WITHOUT UNIQUE KEYS is true whenever IS JSON is true, and IS JSON WITH UNIQUE KEYS is true whenever IS JSON is true except it IS JSON OBJECT is true and there are duplicate keys (which is never the case when applied to jsonb values). Nikita Glukhov Reviewers have included (in no particular order) Andres Freund, Alexander Korotkov, Pavel Stehule, Andrew Alsup, Erik Rijkers, Zihong Yu, Himanshu Upadhyaya, Daniel Gustafsson, Justin Pryzby. Discussion: https://postgr.es/m/cd0bb935-0158-78a7-08b5-904886deac4b@postgrespro.ru Discussion: https://postgr.es/m/20220616233130.rparivafipt6doj3@alap3.anarazel.de Discussion: https://postgr.es/m/abd9b83b-aa66-f230-3d6d-734817f0995d%40postgresql.org --- doc/src/sgml/func.sgml | 64 +++++++++ src/backend/executor/execExpr.c | 13 ++ src/backend/executor/execExprInterp.c | 95 ++++++++++++ src/backend/jit/llvm/llvmjit_expr.c | 6 + src/backend/jit/llvm/llvmjit_types.c | 1 + src/backend/nodes/makefuncs.c | 19 +++ src/backend/nodes/nodeFuncs.c | 26 ++++ src/backend/parser/gram.y | 83 +++++++++-- src/backend/parser/parse_expr.c | 76 ++++++++++ src/backend/parser/parser.c | 6 +- src/backend/utils/adt/json.c | 133 ++++++++++++++++- src/backend/utils/adt/jsonfuncs.c | 20 +++ src/backend/utils/adt/ruleutils.c | 37 +++++ src/include/executor/execExpr.h | 8 ++ src/include/nodes/makefuncs.h | 3 + src/include/nodes/primnodes.h | 26 ++++ src/include/parser/kwlist.h | 1 + src/include/utils/json.h | 1 + src/include/utils/jsonfuncs.h | 3 + src/interfaces/ecpg/preproc/parser.c | 3 + src/test/regress/expected/sqljson.out | 198 ++++++++++++++++++++++++++ src/test/regress/sql/sqljson.sql | 96 +++++++++++++ 22 files changed, 901 insertions(+), 17 deletions(-) diff --git a/doc/src/sgml/func.sgml b/doc/src/sgml/func.sgml index 38e7f46760..6aeff2afd6 100644 --- a/doc/src/sgml/func.sgml +++ b/doc/src/sgml/func.sgml @@ -16844,6 +16844,70 @@ table2-mapping + + + details SQL/JSON + facilities for testing JSON. + + + + SQL/JSON Testing Functions + + + + + Function signature + + + Description + + + Example(s) + + + + + + + IS JSON + expression IS NOT JSON + { VALUE | SCALAR | ARRAY | OBJECT } + { WITH | WITHOUT } UNIQUE KEYS + + + This predicate tests whether expression can be + parsed as JSON, possibly of a specified type. + If SCALAR or ARRAY or + OBJECT is specified, the + test is whether or not the JSON is of that particular type. If + WITH UNIQUE KEYS is specified, then any object in the + expression is also tested to see if it + has duplicate keys. + + + +SELECT js, + js IS JSON "json?", + js IS JSON SCALAR "scalar?", + js IS JSON OBJECT "object?", + js IS JSON ARRAY "array?" +FROM +(VALUES ('123'), ('"abc"'), ('{"a": "b"}'), +('[1,2]'),('abc')) foo(js); + js | json? | scalar? | object? | array? +------------+-------+---------+---------+-------- + 123 | t | t | f | f + "abc" | t | t | f | f + {"a": "b"} | t | f | t | f + [1,2] | t | f | f | t + abc | f | f | f | f + + + + + +
+ diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c index 6c5a378029..ee170829af 100644 --- a/src/backend/executor/execExpr.c +++ b/src/backend/executor/execExpr.c @@ -2495,6 +2495,19 @@ ExecInitExprRec(Expr *node, ExprState *state, break; } + case T_JsonIsPredicate: + { + JsonIsPredicate *pred = (JsonIsPredicate *) node; + + ExecInitExprRec((Expr *) pred->expr, state, resv, resnull); + + scratch.opcode = EEOP_IS_JSON; + scratch.d.is_json.pred = pred; + + ExprEvalPushStep(state, &scratch); + break; + } + default: elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node)); diff --git a/src/backend/executor/execExprInterp.c b/src/backend/executor/execExprInterp.c index a37ba4dd55..201cd7e8d2 100644 --- a/src/backend/executor/execExprInterp.c +++ b/src/backend/executor/execExprInterp.c @@ -73,6 +73,7 @@ #include "utils/expandedrecord.h" #include "utils/json.h" #include "utils/jsonb.h" +#include "utils/jsonfuncs.h" #include "utils/lsyscache.h" #include "utils/memutils.h" #include "utils/timestamp.h" @@ -477,6 +478,7 @@ ExecInterpExpr(ExprState *state, ExprContext *econtext, bool *isnull) &&CASE_EEOP_HASHED_SCALARARRAYOP, &&CASE_EEOP_XMLEXPR, &&CASE_EEOP_JSON_CONSTRUCTOR, + &&CASE_EEOP_IS_JSON, &&CASE_EEOP_AGGREF, &&CASE_EEOP_GROUPING_FUNC, &&CASE_EEOP_WINDOW_FUNC, @@ -1814,6 +1816,14 @@ ExecInterpExpr(ExprState *state, ExprContext *econtext, bool *isnull) EEO_NEXT(); } + EEO_CASE(EEOP_IS_JSON) + { + /* too complex for an inline implementation */ + ExecEvalJsonIsPredicate(state, op); + + EEO_NEXT(); + } + EEO_CASE(EEOP_LAST) { /* unreachable */ @@ -3884,6 +3894,91 @@ ExecEvalXmlExpr(ExprState *state, ExprEvalStep *op) } } +void +ExecEvalJsonIsPredicate(ExprState *state, ExprEvalStep *op) +{ + JsonIsPredicate *pred = op->d.is_json.pred; + Datum js = *op->resvalue; + Oid exprtype; + bool res; + + if (*op->resnull) + { + *op->resvalue = BoolGetDatum(false); + return; + } + + exprtype = exprType(pred->expr); + + if (exprtype == TEXTOID || exprtype == JSONOID) + { + text *json = DatumGetTextP(js); + + if (pred->item_type == JS_TYPE_ANY) + res = true; + else + { + switch (json_get_first_token(json, false)) + { + case JSON_TOKEN_OBJECT_START: + res = pred->item_type == JS_TYPE_OBJECT; + break; + case JSON_TOKEN_ARRAY_START: + res = pred->item_type == JS_TYPE_ARRAY; + break; + case JSON_TOKEN_STRING: + case JSON_TOKEN_NUMBER: + case JSON_TOKEN_TRUE: + case JSON_TOKEN_FALSE: + case JSON_TOKEN_NULL: + res = pred->item_type == JS_TYPE_SCALAR; + break; + default: + res = false; + break; + } + } + + /* + * Do full parsing pass only for uniqueness check or for JSON text + * validation. + */ + if (res && (pred->unique_keys || exprtype == TEXTOID)) + res = json_validate(json, pred->unique_keys, false); + } + else if (exprtype == JSONBOID) + { + if (pred->item_type == JS_TYPE_ANY) + res = true; + else + { + Jsonb *jb = DatumGetJsonbP(js); + + switch (pred->item_type) + { + case JS_TYPE_OBJECT: + res = JB_ROOT_IS_OBJECT(jb); + break; + case JS_TYPE_ARRAY: + res = JB_ROOT_IS_ARRAY(jb) && !JB_ROOT_IS_SCALAR(jb); + break; + case JS_TYPE_SCALAR: + res = JB_ROOT_IS_ARRAY(jb) && JB_ROOT_IS_SCALAR(jb); + break; + default: + res = false; + break; + } + } + + /* Key uniqueness check is redundant for jsonb */ + } + else + res = false; + + *op->resvalue = BoolGetDatum(res); +} + /* * ExecEvalGroupingFunc * diff --git a/src/backend/jit/llvm/llvmjit_expr.c b/src/backend/jit/llvm/llvmjit_expr.c index 12d39394b3..b2922ff8f2 100644 --- a/src/backend/jit/llvm/llvmjit_expr.c +++ b/src/backend/jit/llvm/llvmjit_expr.c @@ -2395,6 +2395,12 @@ llvm_compile_expr(ExprState *state) LLVMBuildBr(b, opblocks[opno + 1]); break; + case EEOP_IS_JSON: + build_EvalXFunc(b, mod, "ExecEvalJsonIsPredicate", + v_state, op); + LLVMBuildBr(b, opblocks[opno + 1]); + break; + case EEOP_LAST: Assert(false); break; diff --git a/src/backend/jit/llvm/llvmjit_types.c b/src/backend/jit/llvm/llvmjit_types.c index 315eeb1172..f61d9390ee 100644 --- a/src/backend/jit/llvm/llvmjit_types.c +++ b/src/backend/jit/llvm/llvmjit_types.c @@ -133,6 +133,7 @@ void *referenced_functions[] = ExecEvalWholeRowVar, ExecEvalXmlExpr, ExecEvalJsonConstructor, + ExecEvalJsonIsPredicate, MakeExpandedObjectReadOnlyInternal, slot_getmissingattrs, slot_getsomeattrs_int, diff --git a/src/backend/nodes/makefuncs.c b/src/backend/nodes/makefuncs.c index 23c7152806..39e1884cf4 100644 --- a/src/backend/nodes/makefuncs.c +++ b/src/backend/nodes/makefuncs.c @@ -894,3 +894,22 @@ makeJsonKeyValue(Node *key, Node *value) return (Node *) n; } + +/* + * makeJsonIsPredicate - + * creates a JsonIsPredicate node + */ +Node * +makeJsonIsPredicate(Node *expr, JsonFormat *format, JsonValueType item_type, + bool unique_keys, int location) +{ + JsonIsPredicate *n = makeNode(JsonIsPredicate); + + n->expr = expr; + n->format = format; + n->item_type = item_type; + n->unique_keys = unique_keys; + n->location = location; + + return (Node *) n; +} diff --git a/src/backend/nodes/nodeFuncs.c b/src/backend/nodes/nodeFuncs.c index 69907fbcde..fdb0c6b3fe 100644 --- a/src/backend/nodes/nodeFuncs.c +++ b/src/backend/nodes/nodeFuncs.c @@ -261,6 +261,9 @@ exprType(const Node *expr) case T_JsonConstructorExpr: type = ((const JsonConstructorExpr *) expr)->returning->typid; break; + case T_JsonIsPredicate: + type = BOOLOID; + break; default: elog(ERROR, "unrecognized node type: %d", (int) nodeTag(expr)); type = InvalidOid; /* keep compiler quiet */ @@ -983,6 +986,9 @@ exprCollation(const Node *expr) coll = InvalidOid; } break; + case T_JsonIsPredicate: + coll = InvalidOid; /* result is always an boolean type */ + break; default: elog(ERROR, "unrecognized node type: %d", (int) nodeTag(expr)); coll = InvalidOid; /* keep compiler quiet */ @@ -1205,6 +1211,9 @@ exprSetCollation(Node *expr, Oid collation) * json[b] type */ } break; + case T_JsonIsPredicate: + Assert(!OidIsValid(collation)); /* result is always boolean */ + break; default: elog(ERROR, "unrecognized node type: %d", (int) nodeTag(expr)); break; @@ -1653,6 +1662,9 @@ exprLocation(const Node *expr) case T_JsonConstructorExpr: loc = ((const JsonConstructorExpr *) expr)->location; break; + case T_JsonIsPredicate: + loc = ((const JsonIsPredicate *) expr)->location; + break; default: /* for any other node type it's just unknown... */ loc = -1; @@ -2406,6 +2418,8 @@ expression_tree_walker_impl(Node *node, return true; } break; + case T_JsonIsPredicate: + return walker(((JsonIsPredicate *) node)->expr, context); default: elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node)); @@ -3413,6 +3427,16 @@ expression_tree_mutator_impl(Node *node, MUTATE(newnode->coercion, jve->coercion, Expr *); MUTATE(newnode->returning, jve->returning, JsonReturning *); + return (Node *) newnode; + } + case T_JsonIsPredicate: + { + JsonIsPredicate *pred = (JsonIsPredicate *) node; + JsonIsPredicate *newnode; + + FLATCOPY(newnode, pred, JsonIsPredicate); + MUTATE(newnode->expr, pred->expr, Node *); + return (Node *) newnode; } default: @@ -4261,6 +4285,8 @@ raw_expression_tree_walker_impl(Node *node, return true; } break; + case T_JsonIsPredicate: + return walker(((JsonIsPredicate *) node)->expr, context); default: elog(ERROR, "unrecognized node type: %d", (int) nodeTag(node)); diff --git a/src/backend/parser/gram.y b/src/backend/parser/gram.y index 54c7896a6c..eeb3d7b225 100644 --- a/src/backend/parser/gram.y +++ b/src/backend/parser/gram.y @@ -655,6 +655,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); json_array_aggregate_order_by_clause_opt %type json_encoding_clause_opt + json_predicate_type_constraint %type json_key_uniqueness_constraint_opt json_object_constructor_null_clause_opt @@ -724,7 +725,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); JOIN JSON JSON_ARRAY JSON_ARRAYAGG JSON_OBJECT JSON_OBJECTAGG - KEY KEYS + KEY KEYS KEEP LABEL LANGUAGE LARGE_P LAST_P LATERAL_P LEADING LEAKPROOF LEAST LEFT LEVEL LIKE LIMIT LISTEN LOAD LOCAL @@ -754,7 +755,8 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); RESET RESTART RESTRICT RETURN RETURNING RETURNS REVOKE RIGHT ROLE ROLLBACK ROLLUP ROUTINE ROUTINES ROW ROWS RULE - SAVEPOINT SCHEMA SCHEMAS SCROLL SEARCH SECOND_P SECURITY SELECT SEQUENCE SEQUENCES + SAVEPOINT SCALAR SCHEMA SCHEMAS SCROLL SEARCH SECOND_P SECURITY SELECT + SEQUENCE SEQUENCES SERIALIZABLE SERVER SESSION SESSION_USER SET SETS SETOF SHARE SHOW SIMILAR SIMPLE SKIP SMALLINT SNAPSHOT SOME SQL_P STABLE STANDALONE_P START STATEMENT STATISTICS STDIN STDOUT STORAGE STORED STRICT_P STRIP_P @@ -791,7 +793,7 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); * FORMAT_LA, NULLS_LA, WITH_LA, and WITHOUT_LA are needed to make the grammar * LALR(1). */ -%token FORMAT_LA NOT_LA NULLS_LA WITH_LA WITHOUT_LA +%token FORMAT_LA NOT_LA NULLS_LA WITH_LA WITH_UNIQUE_LA WITHOUT_LA /* * The grammar likewise thinks these tokens are keywords, but they are never @@ -819,6 +821,13 @@ static Node *makeRecursiveViewSelect(char *relname, List *aliases, Node *query); %nonassoc '<' '>' '=' LESS_EQUALS GREATER_EQUALS NOT_EQUALS %nonassoc BETWEEN IN_P LIKE ILIKE SIMILAR NOT_LA %nonassoc ESCAPE /* ESCAPE must be just above LIKE/ILIKE/SIMILAR */ + +/* SQL/JSON related keywords */ +%nonassoc UNIQUE JSON +%nonassoc KEYS /* UNIQUE [ KEYS ] */ +%nonassoc OBJECT_P SCALAR VALUE_P /* JSON [ OBJECT | SCALAR | VALUE ] */ +%nonassoc WITHOUT_LA WITH_UNIQUE_LA + /* * To support target_el without AS, it used to be necessary to assign IDENT an * explicit precedence just less than Op. While that's not really necessary @@ -1146,6 +1155,7 @@ CreateRoleStmt: opt_with: WITH | WITH_LA + | WITH_UNIQUE_LA | /*EMPTY*/ ; @@ -11534,9 +11544,13 @@ AlterTSConfigurationStmt: } ; -/* Use this if TIME or ORDINALITY after WITH should be taken as an identifier */ +/* + * Use this if TIME, ORDINALITY or UNIQUE after WITH should be taken as an + * identifier + */ any_with: WITH | WITH_LA + | WITH_UNIQUE_LA ; @@ -14851,6 +14865,46 @@ a_expr: c_expr { $$ = $1; } @2), @2); } + | a_expr IS json_predicate_type_constraint + json_key_uniqueness_constraint_opt %prec IS + { + JsonFormat *format = makeJsonFormat(JS_FORMAT_DEFAULT, JS_ENC_DEFAULT, -1); + + $$ = makeJsonIsPredicate($1, format, $3, $4, @1); + } + /* + * Required by standard, but it would conflict with expressions + * like: 'str' || format(...) + | a_expr + FORMAT json_representation + IS json_predicate_type_constraint + json_key_uniqueness_constraint_opt %prec IS + { + $3.location = @2; + $$ = makeJsonIsPredicate($1, $3, $5, $6, @1); + } + */ + | a_expr IS NOT + json_predicate_type_constraint + json_key_uniqueness_constraint_opt %prec IS + { + JsonFormat *format = makeJsonFormat(JS_FORMAT_DEFAULT, JS_ENC_DEFAULT, -1); + + $$ = makeNotExpr(makeJsonIsPredicate($1, format, $4, $5, @1), @1); + } + /* + * Required by standard, but it would conflict with expressions + * like: 'str' || format(...) + | a_expr + FORMAT json_representation + IS NOT + json_predicate_type_constraint + json_key_uniqueness_constraint_opt %prec IS + { + $3.location = @2; + $$ = makeNotExpr(makeJsonIsPredicate($1, $3, $6, $7, @1), @1); + } + */ | DEFAULT { /* @@ -16407,13 +16461,21 @@ json_output_clause_opt: | /* EMPTY */ { $$ = NULL; } ; +json_predicate_type_constraint: + JSON { $$ = JS_TYPE_ANY; } + | JSON VALUE_P { $$ = JS_TYPE_ANY; } + | JSON ARRAY { $$ = JS_TYPE_ARRAY; } + | JSON OBJECT_P { $$ = JS_TYPE_OBJECT; } + | JSON SCALAR { $$ = JS_TYPE_SCALAR; } + ; + /* KEYS is a noise word here */ json_key_uniqueness_constraint_opt: - WITH UNIQUE KEYS { $$ = true; } - | WITH UNIQUE { $$ = true; } - | WITHOUT_LA UNIQUE KEYS { $$ = false; } - | WITHOUT_LA UNIQUE { $$ = false; } - | /* EMPTY */ { $$ = false; } + WITH_UNIQUE_LA UNIQUE KEYS { $$ = true; } + | WITH_UNIQUE_LA UNIQUE { $$ = true; } + | WITHOUT_LA UNIQUE KEYS { $$ = false; } + | WITHOUT_LA UNIQUE { $$ = false; } + | /* EMPTY */ %prec KEYS { $$ = false; } ; json_name_and_value_list: @@ -17183,6 +17245,7 @@ unreserved_keyword: | ROWS | RULE | SAVEPOINT + | SCALAR | SCHEMA | SCHEMAS | SCROLL @@ -17655,6 +17718,7 @@ bare_label_keyword: | JSON_ARRAYAGG | JSON_OBJECT | JSON_OBJECTAGG + | KEEP | KEY | KEYS | LABEL @@ -17785,6 +17849,7 @@ bare_label_keyword: | ROWS | RULE | SAVEPOINT + | SCALAR | SCHEMA | SCHEMAS | SCROLL diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c index a134878b1e..0dab751c5c 100644 --- a/src/backend/parser/parse_expr.c +++ b/src/backend/parser/parse_expr.c @@ -83,6 +83,7 @@ static Node *transformJsonArrayQueryConstructor(ParseState *pstate, JsonArrayQueryConstructor *ctor); static Node *transformJsonObjectAgg(ParseState *pstate, JsonObjectAgg *agg); static Node *transformJsonArrayAgg(ParseState *pstate, JsonArrayAgg *agg); +static Node *transformJsonIsPredicate(ParseState *pstate, JsonIsPredicate *p); static Node *make_row_comparison_op(ParseState *pstate, List *opname, List *largs, List *rargs, int location); static Node *make_row_distinct_op(ParseState *pstate, List *opname, @@ -325,6 +326,10 @@ transformExprRecurse(ParseState *pstate, Node *expr) result = transformJsonArrayAgg(pstate, (JsonArrayAgg *) expr); break; + case T_JsonIsPredicate: + result = transformJsonIsPredicate(pstate, (JsonIsPredicate *) expr); + break; + default: /* should not reach here */ elog(ERROR, "unrecognized node type: %d", (int) nodeTag(expr)); @@ -3817,3 +3822,74 @@ transformJsonArrayConstructor(ParseState *pstate, JsonArrayConstructor *ctor) returning, false, ctor->absent_on_null, ctor->location); } + +static Node * +transformJsonParseArg(ParseState *pstate, Node *jsexpr, JsonFormat *format, + Oid *exprtype) +{ + Node *raw_expr = transformExprRecurse(pstate, jsexpr); + Node *expr = raw_expr; + + *exprtype = exprType(expr); + + /* prepare input document */ + if (*exprtype == BYTEAOID) + { + JsonValueExpr *jve; + + expr = makeCaseTestExpr(raw_expr); + expr = makeJsonByteaToTextConversion(expr, format, exprLocation(expr)); + *exprtype = TEXTOID; + + jve = makeJsonValueExpr((Expr *) raw_expr, format); + + jve->formatted_expr = (Expr *) expr; + expr = (Node *) jve; + } + else + { + char typcategory; + bool typispreferred; + + get_type_category_preferred(*exprtype, &typcategory, &typispreferred); + + if (*exprtype == UNKNOWNOID || typcategory == TYPCATEGORY_STRING) + { + expr = coerce_to_target_type(pstate, (Node *) expr, *exprtype, + TEXTOID, -1, + COERCION_IMPLICIT, + COERCE_IMPLICIT_CAST, -1); + *exprtype = TEXTOID; + } + + if (format->encoding != JS_ENC_DEFAULT) + ereport(ERROR, + (errcode(ERRCODE_FEATURE_NOT_SUPPORTED), + parser_errposition(pstate, format->location), + errmsg("cannot use JSON FORMAT ENCODING clause for non-bytea input types"))); + } + + return expr; +} + +/* + * Transform IS JSON predicate. + */ +static Node * +transformJsonIsPredicate(ParseState *pstate, JsonIsPredicate *pred) +{ + Oid exprtype; + Node *expr = transformJsonParseArg(pstate, pred->expr, pred->format, + &exprtype); + + /* make resulting expression */ + if (exprtype != TEXTOID && exprtype != JSONOID && exprtype != JSONBOID) + ereport(ERROR, + (errcode(ERRCODE_DATATYPE_MISMATCH), + errmsg("cannot use type %s in IS JSON predicate", + format_type_be(exprtype)))); + + /* This intentionally(?) drops the format clause. */ + return makeJsonIsPredicate(expr, NULL, pred->item_type, + pred->unique_keys, pred->location); +} diff --git a/src/backend/parser/parser.c b/src/backend/parser/parser.c index 65eb087657..0520459031 100644 --- a/src/backend/parser/parser.c +++ b/src/backend/parser/parser.c @@ -230,13 +230,17 @@ base_yylex(YYSTYPE *lvalp, YYLTYPE *llocp, core_yyscan_t yyscanner) break; case WITH: - /* Replace WITH by WITH_LA if it's followed by TIME or ORDINALITY */ + /* Replace WITH by WITH_LA if it's followed by TIME or ORDINALITY, and + * by WITH_UNIQUE_LA if it's followed by UNIQUE */ switch (next_token) { case TIME: case ORDINALITY: cur_token = WITH_LA; break; + case UNIQUE: + cur_token = WITH_UNIQUE_LA; + break; } break; diff --git a/src/backend/utils/adt/json.c b/src/backend/utils/adt/json.c index dcd2bb2234..4cd324ca77 100644 --- a/src/backend/utils/adt/json.c +++ b/src/backend/utils/adt/json.c @@ -13,6 +13,7 @@ */ #include "postgres.h" +#include "access/hash.h" #include "catalog/pg_proc.h" #include "catalog/pg_type.h" #include "common/hashfn.h" @@ -62,6 +63,23 @@ typedef struct JsonUniqueHashEntry int object_id; } JsonUniqueHashEntry; +/* Stack element for key uniqueness check during JSON parsing */ +typedef struct JsonUniqueStackEntry +{ + struct JsonUniqueStackEntry *parent; + int object_id; +} JsonUniqueStackEntry; + +/* Context struct for key uniqueness check during JSON parsing */ +typedef struct JsonUniqueParsingState +{ + JsonLexContext *lex; + JsonUniqueCheckState check; + JsonUniqueStackEntry *stack; + int id_counter; + bool unique; +} JsonUniqueParsingState; + /* Context struct for key uniqueness check during JSON building */ typedef struct JsonUniqueBuilderState { @@ -1648,6 +1666,110 @@ escape_json(StringInfo buf, const char *str) appendStringInfoCharMacro(buf, '"'); } +/* Semantic actions for key uniqueness check */ +static JsonParseErrorType +json_unique_object_start(void *_state) +{ + JsonUniqueParsingState *state = _state; + JsonUniqueStackEntry *entry; + + if (!state->unique) + return JSON_SUCCESS; + + /* push object entry to stack */ + entry = palloc(sizeof(*entry)); + entry->object_id = state->id_counter++; + entry->parent = state->stack; + state->stack = entry; + + return JSON_SUCCESS; +} + +static JsonParseErrorType +json_unique_object_end(void *_state) +{ + JsonUniqueParsingState *state = _state; + JsonUniqueStackEntry *entry; + + if (!state->unique) + return JSON_SUCCESS; + + entry = state->stack; + state->stack = entry->parent; /* pop object from stack */ + pfree(entry); + return JSON_SUCCESS; +} + +static JsonParseErrorType +json_unique_object_field_start(void *_state, char *field, bool isnull) +{ + JsonUniqueParsingState *state = _state; + JsonUniqueStackEntry *entry; + + if (!state->unique) + return JSON_SUCCESS; + + /* find key collision in the current object */ + if (json_unique_check_key(&state->check, field, state->stack->object_id)) + return JSON_SUCCESS; + + state->unique = false; + + /* pop all objects entries */ + while ((entry = state->stack)) + { + state->stack = entry->parent; + pfree(entry); + } + return JSON_SUCCESS; +} + +/* Validate JSON text and additionally check key uniqueness */ +bool +json_validate(text *json, bool check_unique_keys, bool throw_error) +{ + JsonLexContext *lex = makeJsonLexContext(json, check_unique_keys); + JsonSemAction uniqueSemAction = {0}; + JsonUniqueParsingState state; + JsonParseErrorType result; + + if (check_unique_keys) + { + state.lex = lex; + state.stack = NULL; + state.id_counter = 0; + state.unique = true; + json_unique_check_init(&state.check); + + uniqueSemAction.semstate = &state; + uniqueSemAction.object_start = json_unique_object_start; + uniqueSemAction.object_field_start = json_unique_object_field_start; + uniqueSemAction.object_end = json_unique_object_end; + } + + result = pg_parse_json(lex, check_unique_keys ? &uniqueSemAction : &nullSemAction); + + if (result != JSON_SUCCESS) + { + if (throw_error) + json_errsave_error(result, lex, NULL); + + return false; /* invalid json */ + } + + if (check_unique_keys && !state.unique) + { + if (throw_error) + ereport(ERROR, + (errcode(ERRCODE_DUPLICATE_JSON_OBJECT_KEY_VALUE), + errmsg("duplicate JSON object key value"))); + + return false; /* not unique keys */ + } + + return true; /* ok */ +} + /* * SQL function json_typeof(json) -> text * @@ -1663,21 +1785,18 @@ escape_json(StringInfo buf, const char *str) Datum json_typeof(PG_FUNCTION_ARGS) { - text *json; - - JsonLexContext *lex; - JsonTokenType tok; + text *json = PG_GETARG_TEXT_PP(0); + JsonLexContext *lex = makeJsonLexContext(json, false); char *type; + JsonTokenType tok; JsonParseErrorType result; - json = PG_GETARG_TEXT_PP(0); - lex = makeJsonLexContext(json, false); - /* Lex exactly one token from the input and check its type. */ result = json_lex(lex); if (result != JSON_SUCCESS) json_errsave_error(result, lex, NULL); tok = lex->token_type; + switch (tok) { case JSON_TOKEN_OBJECT_START: diff --git a/src/backend/utils/adt/jsonfuncs.c b/src/backend/utils/adt/jsonfuncs.c index 7a36f74dad..4c5abaff25 100644 --- a/src/backend/utils/adt/jsonfuncs.c +++ b/src/backend/utils/adt/jsonfuncs.c @@ -5665,3 +5665,23 @@ transform_string_values_scalar(void *state, char *token, JsonTokenType tokentype return JSON_SUCCESS; } + +JsonTokenType +json_get_first_token(text *json, bool throw_error) +{ + JsonLexContext *lex; + JsonParseErrorType result; + + lex = makeJsonLexContext(json, false); + + /* Lex exactly one token from the input and check its type. */ + result = json_lex(lex); + + if (result == JSON_SUCCESS) + return lex->token_type; + + if (throw_error) + json_errsave_error(result, lex, NULL); + + return JSON_TOKEN_INVALID; /* invalid json */ +} diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c index 5f953338f3..b7a736b85b 100644 --- a/src/backend/utils/adt/ruleutils.c +++ b/src/backend/utils/adt/ruleutils.c @@ -8227,6 +8227,7 @@ isSimpleNode(Node *node, Node *parentNode, int prettyFlags) case T_NullTest: case T_BooleanTest: case T_DistinctExpr: + case T_JsonIsPredicate: switch (nodeTag(parentNode)) { case T_FuncExpr: @@ -9530,6 +9531,42 @@ get_rule_expr(Node *node, deparse_context *context, get_json_constructor((JsonConstructorExpr *) node, context, false); break; + case T_JsonIsPredicate: + { + JsonIsPredicate *pred = (JsonIsPredicate *) node; + + if (!PRETTY_PAREN(context)) + appendStringInfoChar(context->buf, '('); + + get_rule_expr_paren(pred->expr, context, true, node); + + appendStringInfoString(context->buf, " IS JSON"); + + /* TODO: handle FORMAT clause */ + + switch (pred->item_type) + { + case JS_TYPE_SCALAR: + appendStringInfoString(context->buf, " SCALAR"); + break; + case JS_TYPE_ARRAY: + appendStringInfoString(context->buf, " ARRAY"); + break; + case JS_TYPE_OBJECT: + appendStringInfoString(context->buf, " OBJECT"); + break; + default: + break; + } + + if (pred->unique_keys) + appendStringInfoString(context->buf, " WITH UNIQUE KEYS"); + + if (!PRETTY_PAREN(context)) + appendStringInfoChar(context->buf, ')'); + } + break; + case T_List: { char *sep; diff --git a/src/include/executor/execExpr.h b/src/include/executor/execExpr.h index f5a72a8b40..ee62f6ff68 100644 --- a/src/include/executor/execExpr.h +++ b/src/include/executor/execExpr.h @@ -236,6 +236,7 @@ typedef enum ExprEvalOp EEOP_HASHED_SCALARARRAYOP, EEOP_XMLEXPR, EEOP_JSON_CONSTRUCTOR, + EEOP_IS_JSON, EEOP_AGGREF, EEOP_GROUPING_FUNC, EEOP_WINDOW_FUNC, @@ -675,6 +676,12 @@ typedef struct ExprEvalStep int setoff; } agg_trans; + /* for EEOP_IS_JSON */ + struct + { + JsonIsPredicate *pred; /* original expression node */ + } is_json; + } d; } ExprEvalStep; @@ -787,6 +794,7 @@ extern void ExecEvalHashedScalarArrayOp(ExprState *state, ExprEvalStep *op, extern void ExecEvalConstraintNotNull(ExprState *state, ExprEvalStep *op); extern void ExecEvalConstraintCheck(ExprState *state, ExprEvalStep *op); extern void ExecEvalXmlExpr(ExprState *state, ExprEvalStep *op); +extern void ExecEvalJsonIsPredicate(ExprState *state, ExprEvalStep *op); extern void ExecEvalGroupingFunc(ExprState *state, ExprEvalStep *op); extern void ExecEvalSubPlan(ExprState *state, ExprEvalStep *op, ExprContext *econtext); diff --git a/src/include/nodes/makefuncs.h b/src/include/nodes/makefuncs.h index 50aa00e0c1..06d991b725 100644 --- a/src/include/nodes/makefuncs.h +++ b/src/include/nodes/makefuncs.h @@ -112,6 +112,9 @@ extern JsonFormat *makeJsonFormat(JsonFormatType type, JsonEncoding encoding, int location); extern JsonValueExpr *makeJsonValueExpr(Expr *expr, JsonFormat *format); extern Node *makeJsonKeyValue(Node *key, Node *value); +extern Node *makeJsonIsPredicate(Node *expr, JsonFormat *format, + JsonValueType item_type, bool unique_keys, + int location); extern JsonEncoding makeJsonEncoding(char *name); #endif /* MAKEFUNC_H */ diff --git a/src/include/nodes/primnodes.h b/src/include/nodes/primnodes.h index de1701c213..bb2fedbaca 100644 --- a/src/include/nodes/primnodes.h +++ b/src/include/nodes/primnodes.h @@ -1583,6 +1583,32 @@ typedef struct JsonConstructorExpr int location; } JsonConstructorExpr; +/* + * JsonValueType - + * representation of JSON item type in IS JSON predicate + */ +typedef enum JsonValueType +{ + JS_TYPE_ANY, /* IS JSON [VALUE] */ + JS_TYPE_OBJECT, /* IS JSON OBJECT */ + JS_TYPE_ARRAY, /* IS JSON ARRAY */ + JS_TYPE_SCALAR /* IS JSON SCALAR */ +} JsonValueType; + +/* + * JsonIsPredicate - + * representation of IS JSON predicate + */ +typedef struct JsonIsPredicate +{ + NodeTag type; + Node *expr; /* subject expression */ + JsonFormat *format; /* FORMAT clause, if specified */ + JsonValueType item_type; /* JSON item type */ + bool unique_keys; /* check key uniqueness? */ + int location; /* token location, or -1 if unknown */ +} JsonIsPredicate; + /* ---------------- * NullTest * diff --git a/src/include/parser/kwlist.h b/src/include/parser/kwlist.h index 868f389a04..f5b2e61ca5 100644 --- a/src/include/parser/kwlist.h +++ b/src/include/parser/kwlist.h @@ -376,6 +376,7 @@ PG_KEYWORD("row", ROW, COL_NAME_KEYWORD, BARE_LABEL) PG_KEYWORD("rows", ROWS, UNRESERVED_KEYWORD, BARE_LABEL) PG_KEYWORD("rule", RULE, UNRESERVED_KEYWORD, BARE_LABEL) PG_KEYWORD("savepoint", SAVEPOINT, UNRESERVED_KEYWORD, BARE_LABEL) +PG_KEYWORD("scalar", SCALAR, UNRESERVED_KEYWORD, BARE_LABEL) PG_KEYWORD("schema", SCHEMA, UNRESERVED_KEYWORD, BARE_LABEL) PG_KEYWORD("schemas", SCHEMAS, UNRESERVED_KEYWORD, BARE_LABEL) PG_KEYWORD("scroll", SCROLL, UNRESERVED_KEYWORD, BARE_LABEL) diff --git a/src/include/utils/json.h b/src/include/utils/json.h index b75f7d929d..35a9a5545d 100644 --- a/src/include/utils/json.h +++ b/src/include/utils/json.h @@ -26,5 +26,6 @@ extern Datum json_build_object_worker(int nargs, Datum *args, bool *nulls, bool unique_keys); extern Datum json_build_array_worker(int nargs, Datum *args, bool *nulls, Oid *types, bool absent_on_null); +extern bool json_validate(text *json, bool check_unique_keys, bool throw_error); #endif /* JSON_H */ diff --git a/src/include/utils/jsonfuncs.h b/src/include/utils/jsonfuncs.h index fc610f6503..a85203d4a4 100644 --- a/src/include/utils/jsonfuncs.h +++ b/src/include/utils/jsonfuncs.h @@ -50,6 +50,9 @@ extern bool pg_parse_json_or_errsave(JsonLexContext *lex, JsonSemAction *sem, extern void json_errsave_error(JsonParseErrorType error, JsonLexContext *lex, struct Node *escontext); +/* get first JSON token */ +extern JsonTokenType json_get_first_token(text *json, bool throw_error); + extern uint32 parse_jsonb_index_flags(Jsonb *jb); extern void iterate_jsonb_values(Jsonb *jb, uint32 flags, void *state, JsonIterateStringValuesAction action); diff --git a/src/interfaces/ecpg/preproc/parser.c b/src/interfaces/ecpg/preproc/parser.c index a40f4bef09..30010a5706 100644 --- a/src/interfaces/ecpg/preproc/parser.c +++ b/src/interfaces/ecpg/preproc/parser.c @@ -155,6 +155,9 @@ filtered_base_yylex(void) case ORDINALITY: cur_token = WITH_LA; break; + case UNIQUE: + cur_token = WITH_UNIQUE_LA; + break; } break; diff --git a/src/test/regress/expected/sqljson.out b/src/test/regress/expected/sqljson.out index c4bfe80ba9..d73c7e2c6c 100644 --- a/src/test/regress/expected/sqljson.out +++ b/src/test/regress/expected/sqljson.out @@ -754,3 +754,201 @@ CREATE OR REPLACE VIEW public.json_array_subquery_view AS FROM ( SELECT foo.i FROM ( VALUES (1), (2), (NULL::integer), (4)) foo(i)) q(a)) AS "json_array" DROP VIEW json_array_subquery_view; +-- IS JSON predicate +SELECT NULL IS JSON; + ?column? +---------- + +(1 row) + +SELECT NULL IS NOT JSON; + ?column? +---------- + +(1 row) + +SELECT NULL::json IS JSON; + ?column? +---------- + +(1 row) + +SELECT NULL::jsonb IS JSON; + ?column? +---------- + +(1 row) + +SELECT NULL::text IS JSON; + ?column? +---------- + +(1 row) + +SELECT NULL::bytea IS JSON; + ?column? +---------- + +(1 row) + +SELECT NULL::int IS JSON; +ERROR: cannot use type integer in IS JSON predicate +SELECT '' IS JSON; + ?column? +---------- + f +(1 row) + +SELECT bytea '\x00' IS JSON; +ERROR: invalid byte sequence for encoding "UTF8": 0x00 +CREATE TABLE test_is_json (js text); +INSERT INTO test_is_json VALUES + (NULL), + (''), + ('123'), + ('"aaa "'), + ('true'), + ('null'), + ('[]'), + ('[1, "2", {}]'), + ('{}'), + ('{ "a": 1, "b": null }'), + ('{ "a": 1, "a": null }'), + ('{ "a": 1, "b": [{ "a": 1 }, { "a": 2 }] }'), + ('{ "a": 1, "b": [{ "a": 1, "b": 0, "a": 2 }] }'), + ('aaa'), + ('{a:1}'), + ('["a",]'); +SELECT + js, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + test_is_json; + js | IS JSON | IS NOT JSON | IS VALUE | IS OBJECT | IS ARRAY | IS SCALAR | WITHOUT UNIQUE | WITH UNIQUE +-----------------------------------------------+---------+-------------+----------+-----------+----------+-----------+----------------+------------- + | | | | | | | | + | f | t | f | f | f | f | f | f + 123 | t | f | t | f | f | t | t | t + "aaa " | t | f | t | f | f | t | t | t + true | t | f | t | f | f | t | t | t + null | t | f | t | f | f | t | t | t + [] | t | f | t | f | t | f | t | t + [1, "2", {}] | t | f | t | f | t | f | t | t + {} | t | f | t | t | f | f | t | t + { "a": 1, "b": null } | t | f | t | t | f | f | t | t + { "a": 1, "a": null } | t | f | t | t | f | f | t | f + { "a": 1, "b": [{ "a": 1 }, { "a": 2 }] } | t | f | t | t | f | f | t | t + { "a": 1, "b": [{ "a": 1, "b": 0, "a": 2 }] } | t | f | t | t | f | f | t | f + aaa | f | t | f | f | f | f | f | f + {a:1} | f | t | f | f | f | f | f | f + ["a",] | f | t | f | f | f | f | f | f +(16 rows) + +SELECT + js, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + (SELECT js::json FROM test_is_json WHERE js IS JSON) foo(js); + js | IS JSON | IS NOT JSON | IS VALUE | IS OBJECT | IS ARRAY | IS SCALAR | WITHOUT UNIQUE | WITH UNIQUE +-----------------------------------------------+---------+-------------+----------+-----------+----------+-----------+----------------+------------- + 123 | t | f | t | f | f | t | t | t + "aaa " | t | f | t | f | f | t | t | t + true | t | f | t | f | f | t | t | t + null | t | f | t | f | f | t | t | t + [] | t | f | t | f | t | f | t | t + [1, "2", {}] | t | f | t | f | t | f | t | t + {} | t | f | t | t | f | f | t | t + { "a": 1, "b": null } | t | f | t | t | f | f | t | t + { "a": 1, "a": null } | t | f | t | t | f | f | t | f + { "a": 1, "b": [{ "a": 1 }, { "a": 2 }] } | t | f | t | t | f | f | t | t + { "a": 1, "b": [{ "a": 1, "b": 0, "a": 2 }] } | t | f | t | t | f | f | t | f +(11 rows) + +SELECT + js0, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + (SELECT js, js::bytea FROM test_is_json WHERE js IS JSON) foo(js0, js); + js0 | IS JSON | IS NOT JSON | IS VALUE | IS OBJECT | IS ARRAY | IS SCALAR | WITHOUT UNIQUE | WITH UNIQUE +-----------------------------------------------+---------+-------------+----------+-----------+----------+-----------+----------------+------------- + 123 | t | f | t | f | f | t | t | t + "aaa " | t | f | t | f | f | t | t | t + true | t | f | t | f | f | t | t | t + null | t | f | t | f | f | t | t | t + [] | t | f | t | f | t | f | t | t + [1, "2", {}] | t | f | t | f | t | f | t | t + {} | t | f | t | t | f | f | t | t + { "a": 1, "b": null } | t | f | t | t | f | f | t | t + { "a": 1, "a": null } | t | f | t | t | f | f | t | f + { "a": 1, "b": [{ "a": 1 }, { "a": 2 }] } | t | f | t | t | f | f | t | t + { "a": 1, "b": [{ "a": 1, "b": 0, "a": 2 }] } | t | f | t | t | f | f | t | f +(11 rows) + +SELECT + js, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + (SELECT js::jsonb FROM test_is_json WHERE js IS JSON) foo(js); + js | IS JSON | IS NOT JSON | IS VALUE | IS OBJECT | IS ARRAY | IS SCALAR | WITHOUT UNIQUE | WITH UNIQUE +-------------------------------------+---------+-------------+----------+-----------+----------+-----------+----------------+------------- + 123 | t | f | t | f | f | t | t | t + "aaa " | t | f | t | f | f | t | t | t + true | t | f | t | f | f | t | t | t + null | t | f | t | f | f | t | t | t + [] | t | f | t | f | t | f | t | t + [1, "2", {}] | t | f | t | f | t | f | t | t + {} | t | f | t | t | f | f | t | t + {"a": 1, "b": null} | t | f | t | t | f | f | t | t + {"a": null} | t | f | t | t | f | f | t | t + {"a": 1, "b": [{"a": 1}, {"a": 2}]} | t | f | t | t | f | f | t | t + {"a": 1, "b": [{"a": 2, "b": 0}]} | t | f | t | t | f | f | t | t +(11 rows) + +-- Test IS JSON deparsing +EXPLAIN (VERBOSE, COSTS OFF) +SELECT '1' IS JSON AS "any", ('1' || i) IS JSON SCALAR AS "scalar", '[]' IS NOT JSON ARRAY AS "array", '{}' IS JSON OBJECT WITH UNIQUE AS "object" FROM generate_series(1, 3) i; + QUERY PLAN +---------------------------------------------------------------------------------------------------------------------------------------------------------- + Function Scan on pg_catalog.generate_series i + Output: ('1'::text IS JSON), (('1'::text || (i)::text) IS JSON SCALAR), (NOT ('[]'::text IS JSON ARRAY)), ('{}'::text IS JSON OBJECT WITH UNIQUE KEYS) + Function Call: generate_series(1, 3) +(3 rows) + +CREATE VIEW is_json_view AS +SELECT '1' IS JSON AS "any", ('1' || i) IS JSON SCALAR AS "scalar", '[]' IS NOT JSON ARRAY AS "array", '{}' IS JSON OBJECT WITH UNIQUE AS "object" FROM generate_series(1, 3) i; +\sv is_json_view +CREATE OR REPLACE VIEW public.is_json_view AS + SELECT '1'::text IS JSON AS "any", + ('1'::text || i) IS JSON SCALAR AS scalar, + NOT '[]'::text IS JSON ARRAY AS "array", + '{}'::text IS JSON OBJECT WITH UNIQUE KEYS AS object + FROM generate_series(1, 3) i(i) +DROP VIEW is_json_view; diff --git a/src/test/regress/sql/sqljson.sql b/src/test/regress/sql/sqljson.sql index fbbf6a6d6e..4fd820fd51 100644 --- a/src/test/regress/sql/sqljson.sql +++ b/src/test/regress/sql/sqljson.sql @@ -282,3 +282,99 @@ SELECT JSON_ARRAY(SELECT i FROM (VALUES (1), (2), (NULL), (4)) foo(i) RETURNING \sv json_array_subquery_view DROP VIEW json_array_subquery_view; + +-- IS JSON predicate +SELECT NULL IS JSON; +SELECT NULL IS NOT JSON; +SELECT NULL::json IS JSON; +SELECT NULL::jsonb IS JSON; +SELECT NULL::text IS JSON; +SELECT NULL::bytea IS JSON; +SELECT NULL::int IS JSON; + +SELECT '' IS JSON; + +SELECT bytea '\x00' IS JSON; + +CREATE TABLE test_is_json (js text); + +INSERT INTO test_is_json VALUES + (NULL), + (''), + ('123'), + ('"aaa "'), + ('true'), + ('null'), + ('[]'), + ('[1, "2", {}]'), + ('{}'), + ('{ "a": 1, "b": null }'), + ('{ "a": 1, "a": null }'), + ('{ "a": 1, "b": [{ "a": 1 }, { "a": 2 }] }'), + ('{ "a": 1, "b": [{ "a": 1, "b": 0, "a": 2 }] }'), + ('aaa'), + ('{a:1}'), + ('["a",]'); + +SELECT + js, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + test_is_json; + +SELECT + js, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + (SELECT js::json FROM test_is_json WHERE js IS JSON) foo(js); + +SELECT + js0, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + (SELECT js, js::bytea FROM test_is_json WHERE js IS JSON) foo(js0, js); + +SELECT + js, + js IS JSON "IS JSON", + js IS NOT JSON "IS NOT JSON", + js IS JSON VALUE "IS VALUE", + js IS JSON OBJECT "IS OBJECT", + js IS JSON ARRAY "IS ARRAY", + js IS JSON SCALAR "IS SCALAR", + js IS JSON WITHOUT UNIQUE KEYS "WITHOUT UNIQUE", + js IS JSON WITH UNIQUE KEYS "WITH UNIQUE" +FROM + (SELECT js::jsonb FROM test_is_json WHERE js IS JSON) foo(js); + +-- Test IS JSON deparsing +EXPLAIN (VERBOSE, COSTS OFF) +SELECT '1' IS JSON AS "any", ('1' || i) IS JSON SCALAR AS "scalar", '[]' IS NOT JSON ARRAY AS "array", '{}' IS JSON OBJECT WITH UNIQUE AS "object" FROM generate_series(1, 3) i; + +CREATE VIEW is_json_view AS +SELECT '1' IS JSON AS "any", ('1' || i) IS JSON SCALAR AS "scalar", '[]' IS NOT JSON ARRAY AS "array", '{}' IS JSON OBJECT WITH UNIQUE AS "object" FROM generate_series(1, 3) i; + +\sv is_json_view + +DROP VIEW is_json_view; -- 2.30.2