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Preserve tz when converting to jsonb timestamptz

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This removes an inconsistency in the treatment of different datatypes by
the jsonpath timestamp_tz() function. Conversions from data types that
are not timestamp-aware, such as date and timestamp, are now treated
consistently with conversion from those that are such as timestamptz.

Author: David Wheeler
Reviewed-by: Junwang Zhao and Jeevan Chalke

Discussion: https://postgr.es/m/7DE080CE-6D8C-4794-9BD1-7D9699172FAB%40justatheory.com

Backpatch to release 17.
This commit is contained in:
Andrew Dunstan
2024-07-30 07:57:38 -04:00
parent 06ffce4559
commit 524d490a9f
2 changed files with 27 additions and 2 deletions
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25
src/backend/utils/adt/jsonpath_exec.c
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@@ -2707,12 +2707,27 @@ executeDateTimeMethod(JsonPathExecContext *cxt, JsonPathItem *jsp,
break;
case jpiTimestampTz:
{
struct pg_tm tm;
fsec_t fsec;
/* Convert result type to timestamp with time zone */
switch (typid)
{
case DATEOID:
checkTimezoneIsUsedForCast(cxt->useTz,
"date", "timestamptz");
/*
* Get the timezone value explicitly since JsonbValue
* keeps that separate.
*/
j2date(DatumGetDateADT(value) + POSTGRES_EPOCH_JDATE,
&(tm.tm_year), &(tm.tm_mon), &(tm.tm_mday));
tm.tm_hour = 0;
tm.tm_min = 0;
tm.tm_sec = 0;
tz = DetermineTimeZoneOffset(&tm, session_timezone);
value = DirectFunctionCall1(date_timestamptz,
value);
break;
@@ -2726,6 +2741,16 @@ executeDateTimeMethod(JsonPathExecContext *cxt, JsonPathItem *jsp,
case TIMESTAMPOID:
checkTimezoneIsUsedForCast(cxt->useTz,
"timestamp", "timestamptz");
/*
* Get the timezone value explicitly since JsonbValue
* keeps that separate.
*/
if (timestamp2tm(DatumGetTimestamp(value), NULL, &tm,
&fsec, NULL, NULL) == 0)
tz = DetermineTimeZoneOffset(&tm,
session_timezone);
value = DirectFunctionCall1(timestamp_timestamptz,
value);
break;