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Add support for AT LOCAL

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When converting a timestamp to/from with/without time zone, the SQL
Standard specifies an AT LOCAL variant of AT TIME ZONE which uses the
session's time zone.  This includes three system functions able to do
the work in the same way as the existing flavors for AT TIME ZONE,
except that these need to be marked as stable as they depend on the
session's TimeZone GUC.

Bump catalog version.

Author: Vik Fearing
Reviewed-by: Laurenz Albe, Cary Huang, Michael Paquier
Discussion: https://postgr.es/m/8e25dec4-5667-c1a5-6581-167d710c2182@postgresfriends.org
This commit is contained in:
Michael Paquier
2023-10-13 13:01:37 +09:00
parent 0013ba290b
commit 97957fdbaa
11 changed files with 294 additions and 4 deletions
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10
src/backend/utils/adt/ruleutils.c
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@ -10347,6 +10347,16 @@ get_func_sql_syntax(FuncExpr *expr, deparse_context *context)
appendStringInfoChar(buf, ')');
return true;
case F_TIMEZONE_TIMESTAMP:
case F_TIMEZONE_TIMESTAMPTZ:
case F_TIMEZONE_TIMETZ:
/* AT LOCAL */
appendStringInfoChar(buf, '(');
get_rule_expr_paren((Node *) linitial(expr->args), context, false,
(Node *) expr);
appendStringInfoString(buf, " AT LOCAL)");
return true;
case F_OVERLAPS_TIMESTAMPTZ_INTERVAL_TIMESTAMPTZ_INTERVAL:
case F_OVERLAPS_TIMESTAMPTZ_INTERVAL_TIMESTAMPTZ_TIMESTAMPTZ:
case F_OVERLAPS_TIMESTAMPTZ_TIMESTAMPTZ_TIMESTAMPTZ_INTERVAL: