From 22e3b558052aa209cba2a8fec192d76b5faef19e Mon Sep 17 00:00:00 2001 From: Michael Paquier Date: Wed, 21 Dec 2022 10:11:22 +0900 Subject: Switch some system functions to use get_call_result_type() MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit This shaves some code by replacing the combinations of CreateTemplateTupleDesc()/TupleDescInitEntry() hardcoding a mapping of the attributes listed in pg_proc.dat by get_call_result_type() to build the TupleDesc needed for the rows generated. get_call_result_type() is more expensive than the former style, but this removes some duplication with the lists of OUT parameters (pg_proc.dat and the attributes hardcoded in these code paths). This is applied to functions that are not considered as critical (aka that could be called repeatedly for monitoring purposes). Author: Bharath Rupireddy Reviewed-by: Robert Haas, Álvaro Herrera, Tom Lane, Michael Paquier Discussion: https://postgr.es/m/CALj2ACV23HW5HP5hFjd89FNS-z5X8r2jNXdMXcpN2BgTtKd87w@mail.gmail.com --- src/backend/utils/adt/datetime.c | 17 ++++------------- 1 file changed, 4 insertions(+), 13 deletions(-) (limited to 'src/backend/utils/adt/datetime.c') diff --git a/src/backend/utils/adt/datetime.c b/src/backend/utils/adt/datetime.c index b5b117a8ca7..8afda0e5d22 100644 --- a/src/backend/utils/adt/datetime.c +++ b/src/backend/utils/adt/datetime.c @@ -4983,19 +4983,10 @@ pg_timezone_abbrevs(PG_FUNCTION_ARGS) *pindex = 0; funcctx->user_fctx = (void *) pindex; - /* - * build tupdesc for result tuples. This must match this function's - * pg_proc entry! - */ - tupdesc = CreateTemplateTupleDesc(3); - TupleDescInitEntry(tupdesc, (AttrNumber) 1, "abbrev", - TEXTOID, -1, 0); - TupleDescInitEntry(tupdesc, (AttrNumber) 2, "utc_offset", - INTERVALOID, -1, 0); - TupleDescInitEntry(tupdesc, (AttrNumber) 3, "is_dst", - BOOLOID, -1, 0); - - funcctx->tuple_desc = BlessTupleDesc(tupdesc); + if (get_call_result_type(fcinfo, NULL, &tupdesc) != TYPEFUNC_COMPOSITE) + elog(ERROR, "return type must be a row type"); + funcctx->tuple_desc = tupdesc; + MemoryContextSwitchTo(oldcontext); } -- cgit v1.2.3