3 files changed, 25 insertions, 0 deletions
diff --git a/src/backend/utils/activity/pgstat.c b/src/backend/utils/activity/pgstat.c
index 48f57e408e1..7ef06150df7 100644
--- a/src/backend/utils/activity/pgstat.c
+++ b/src/backend/utils/activity/pgstat.c
@@ -328,6 +328,7 @@ static const PgStat_KindInfo pgstat_kind_builtin_infos[PGSTAT_KIND_BUILTIN_SIZE]
 		.pending_size = sizeof(PgStat_FunctionCounts),
 
 		.flush_pending_cb = pgstat_function_flush_cb,
+		.reset_timestamp_cb = pgstat_function_reset_timestamp_cb,
 	},
 
 	[PGSTAT_KIND_REPLSLOT] = {
diff --git a/src/backend/utils/activity/pgstat_function.c b/src/backend/utils/activity/pgstat_function.c
index 6214f93d36e..b5db9d15e07 100644
--- a/src/backend/utils/activity/pgstat_function.c
+++ b/src/backend/utils/activity/pgstat_function.c
@@ -214,6 +214,12 @@ pgstat_function_flush_cb(PgStat_EntryRef *entry_ref, bool nowait)
 	return true;
 }
 
+void
+pgstat_function_reset_timestamp_cb(PgStatShared_Common *header, TimestampTz ts)
+{
+	((PgStatShared_Function *) header)->stats.stat_reset_timestamp = ts;
+}
+
 /*
  * find any existing PgStat_FunctionCounts entry for specified function
  *
diff --git a/src/backend/utils/adt/pgstatfuncs.c b/src/backend/utils/adt/pgstatfuncs.c
index 7e89a8048d5..3802a4cb888 100644
--- a/src/backend/utils/adt/pgstatfuncs.c
+++ b/src/backend/utils/adt/pgstatfuncs.c
@@ -204,6 +204,24 @@ PG_STAT_GET_FUNCENTRY_FLOAT8_MS(total_time)
 PG_STAT_GET_FUNCENTRY_FLOAT8_MS(self_time)
 
 Datum
+pg_stat_get_function_stat_reset_time(PG_FUNCTION_ARGS)
+{
+	Oid			funcid = PG_GETARG_OID(0);
+	TimestampTz result;
+	PgStat_StatFuncEntry *funcentry;
+
+	if ((funcentry = pgstat_fetch_stat_funcentry(funcid)) == NULL)
+		result = 0;
+	else
+		result = funcentry->stat_reset_timestamp;
+
+	if (result == 0)
+		PG_RETURN_NULL();
+	else
+		PG_RETURN_TIMESTAMPTZ(result);
+}
+
+Datum
 pg_stat_get_backend_idset(PG_FUNCTION_ARGS)
 {
 	FuncCallContext *funcctx;