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SQL/JSON query functions

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This introduces the SQL/JSON functions for querying JSON data using
jsonpath expressions. The functions are:

JSON_EXISTS()
JSON_QUERY()
JSON_VALUE()

All of these functions only operate on jsonb. The workaround for now is
to cast the argument to jsonb.

JSON_EXISTS() tests if the jsonpath expression applied to the jsonb
value yields any values. JSON_VALUE() must return a single value, and an
error occurs if it tries to return multiple values. JSON_QUERY() must
return a json object or array, and there are various WRAPPER options for
handling scalar or multi-value results. Both these functions have
options for handling EMPTY and ERROR conditions.

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
This commit is contained in:
Andrew Dunstan
2022-03-03 13:11:14 -05:00
parent 3d067c53b2
commit 1a36bc9dba
39 changed files with 4719 additions and 124 deletions
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45
src/backend/utils/adt/formatting.c
View File

@ -1023,11 +1023,6 @@ typedef struct NUMProc
*L_currency_symbol;
} NUMProc;
/* Return flags for DCH_from_char() */
#define DCH_DATED 0x01
#define DCH_TIMED 0x02
#define DCH_ZONED 0x04
/* ----------
* Functions
* ----------
@ -6672,3 +6667,43 @@ float8_to_char(PG_FUNCTION_ARGS)
NUM_TOCHAR_finish;
PG_RETURN_TEXT_P(result);
}
int
datetime_format_flags(const char *fmt_str, bool *have_error)
{
bool incache;
int fmt_len = strlen(fmt_str);
int result;
FormatNode *format;
if (fmt_len > DCH_CACHE_SIZE)
{
/*
* Allocate new memory if format picture is bigger than static cache
* and do not use cache (call parser always)
*/
incache = false;
format = (FormatNode *) palloc((fmt_len + 1) * sizeof(FormatNode));
parse_format(format, fmt_str, DCH_keywords,
DCH_suff, DCH_index, DCH_FLAG, NULL);
}
else
{
/*
* Use cache buffers
*/
DCHCacheEntry *ent = DCH_cache_fetch(fmt_str, false);
incache = true;
format = ent->format;
}
result = DCH_datetime_type(format, have_error);
if (!incache)
pfree(format);
return result;
}