716bd12d22
Instead of looking up casts at parse time for converting the result of JsonPath* query functions to the specified or the default RETURNING type, always perform the conversion at runtime using either the target type's input function or the function json_populate_type(). There are two motivations for this change: 1. json_populate_type() coerces to types with typmod such that any string values that exceed length limit cause an error instead of silent truncation, which is necessary to be standard-conforming. 2. It was possible to end up with a cast expression that doesn't support soft handling of errors causing bugs in the of handling ON ERROR clause. JsonExpr.coercion_expr which would store the cast expression is no longer necessary, so remove. Bump catversion because stored rules change because of the above removal. Reported-by: Alvaro Herrera <alvherre@alvh.no-ip.org> Reviewed-by: Jian He <jian.universality@gmail.com> Discussion: Discussion: https://postgr.es/m/202405271326.5a5rprki64aw%40alvherre.pgsql
100 lines
3.6 KiB
C
100 lines
3.6 KiB
C
/*-------------------------------------------------------------------------
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*
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* jsonfuncs.h
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* Functions to process JSON data types.
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*
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* Portions Copyright (c) 1996-2024, PostgreSQL Global Development Group
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* Portions Copyright (c) 1994, Regents of the University of California
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*
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* src/include/utils/jsonfuncs.h
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*
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*-------------------------------------------------------------------------
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*/
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#ifndef JSONFUNCS_H
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#define JSONFUNCS_H
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#include "common/jsonapi.h"
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#include "nodes/nodes.h"
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#include "utils/jsonb.h"
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/*
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* Flag types for iterate_json(b)_values to specify what elements from a
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* json(b) document we want to iterate.
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*/
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typedef enum JsonToIndex
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{
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jtiKey = 0x01,
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jtiString = 0x02,
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jtiNumeric = 0x04,
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jtiBool = 0x08,
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jtiAll = jtiKey | jtiString | jtiNumeric | jtiBool
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} JsonToIndex;
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/* an action that will be applied to each value in iterate_json(b)_values functions */
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typedef void (*JsonIterateStringValuesAction) (void *state, char *elem_value, int elem_len);
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/* an action that will be applied to each value in transform_json(b)_values functions */
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typedef text *(*JsonTransformStringValuesAction) (void *state, char *elem_value, int elem_len);
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/* build a JsonLexContext from a text datum; see also freeJsonLexContext */
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extern JsonLexContext *makeJsonLexContext(JsonLexContext *lex, text *json, bool need_escapes);
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/* try to parse json, and errsave(escontext) on failure */
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extern bool pg_parse_json_or_errsave(JsonLexContext *lex, JsonSemAction *sem,
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struct Node *escontext);
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#define pg_parse_json_or_ereport(lex, sem) \
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(void) pg_parse_json_or_errsave(lex, sem, NULL)
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/* save an error during json lexing or parsing */
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extern void json_errsave_error(JsonParseErrorType error, JsonLexContext *lex,
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struct Node *escontext);
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/* get first JSON token */
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extern JsonTokenType json_get_first_token(text *json, bool throw_error);
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extern uint32 parse_jsonb_index_flags(Jsonb *jb);
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extern void iterate_jsonb_values(Jsonb *jb, uint32 flags, void *state,
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JsonIterateStringValuesAction action);
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extern void iterate_json_values(text *json, uint32 flags, void *action_state,
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JsonIterateStringValuesAction action);
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extern Jsonb *transform_jsonb_string_values(Jsonb *jsonb, void *action_state,
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JsonTransformStringValuesAction transform_action);
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extern text *transform_json_string_values(text *json, void *action_state,
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JsonTransformStringValuesAction transform_action);
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/* Type categories returned by json_categorize_type */
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typedef enum
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{
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JSONTYPE_NULL, /* null, so we didn't bother to identify */
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JSONTYPE_BOOL, /* boolean (built-in types only) */
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JSONTYPE_NUMERIC, /* numeric (ditto) */
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JSONTYPE_DATE, /* we use special formatting for datetimes */
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JSONTYPE_TIMESTAMP,
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JSONTYPE_TIMESTAMPTZ,
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JSONTYPE_JSON, /* JSON (and JSONB, if not is_jsonb) */
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JSONTYPE_JSONB, /* JSONB (if is_jsonb) */
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JSONTYPE_ARRAY, /* array */
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JSONTYPE_COMPOSITE, /* composite */
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JSONTYPE_CAST, /* something with an explicit cast to JSON */
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JSONTYPE_OTHER, /* all else */
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} JsonTypeCategory;
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extern void json_categorize_type(Oid typoid, bool is_jsonb,
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JsonTypeCategory *tcategory, Oid *outfuncoid);
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extern Datum datum_to_json(Datum val, JsonTypeCategory tcategory,
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Oid outfuncoid);
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extern Datum datum_to_jsonb(Datum val, JsonTypeCategory tcategory,
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Oid outfuncoid);
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extern Datum jsonb_from_text(text *js, bool unique_keys);
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extern Datum json_populate_type(Datum json_val, Oid json_type,
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Oid typid, int32 typmod,
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void **cache, MemoryContext mcxt,
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bool *isnull,
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bool omit_quotes,
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Node *escontext);
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#endif
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