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Switch some system functions to use get_call_result_type()

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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
This commit is contained in:
Michael Paquier
2022-12-21 10:11:22 +09:00
parent f03bd5717e
commit 22e3b55805
12 changed files with 61 additions and 285 deletions
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14
src/backend/utils/adt/partitionfuncs.c
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@@ -88,17 +88,9 @@ pg_partition_tree(PG_FUNCTION_ARGS)
*/
partitions = find_all_inheritors(rootrelid, AccessShareLock, NULL);
tupdesc = CreateTemplateTupleDesc(PG_PARTITION_TREE_COLS);
TupleDescInitEntry(tupdesc, (AttrNumber) 1, "relid",
REGCLASSOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 2, "parentid",
REGCLASSOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 3, "isleaf",
BOOLOID, -1, 0);
TupleDescInitEntry(tupdesc, (AttrNumber) 4, "level",
INT4OID, -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;
/* The only state we need is the partition list */
funcctx->user_fctx = (void *) partitions;