From: Justin Pryzby <pryzbyj@telsasoft.com>
Date: Wed, 5 May 2021 04:29:00 -0500
Subject: [PATCH 1/3] Return NULL rather than elog(ERROR) for sql-callable
 function

---
 src/backend/utils/adt/ruleutils.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 0a4fa93d01..881e8ec03d 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -1759,9 +1759,9 @@ pg_get_statisticsobjdef_expressions(PG_FUNCTION_ARGS)
 	statexttup = SearchSysCache1(STATEXTOID, ObjectIdGetDatum(statextid));
 
 	if (!HeapTupleIsValid(statexttup))
-		elog(ERROR, "cache lookup failed for statistics object %u", statextid);
+		PG_RETURN_NULL();
 
-	/* has the statistics expressions? */
+	/* Does the stats object have expressions? */
 	has_exprs = !heap_attisnull(statexttup, Anum_pg_statistic_ext_stxexprs, NULL);
 
 	/* no expressions? we're done */
-- 
2.17.0


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