From 4a149cb833dbb45507cd52e63707311e9642587c Mon Sep 17 00:00:00 2001
From: Sven Klemm <sven@timescale.com>
Date: Sat, 19 Sep 2020 23:20:37 +0200
Subject: [PATCH] Adjust code to PG13 list sort changes

PG13 changes the name of the list sorting function from list_qsort
to list_sort. Additionally PG13 does in-place sort.

https://github.com/postgres/postgres/commit/569ed7f483

Signed-off-by: Maxim Kochetkov <fido_max@inbox.ru>
Fetch from: https://github.com/timescale/timescaledb/commit/13d8aac33b6fc5104c8ad1da816dc0d009fc13a7.patch
---
 src/bgw/scheduler.c | 15 ++++++++++++++-
 1 file changed, 14 insertions(+), 1 deletion(-)

diff --git a/src/bgw/scheduler.c b/src/bgw/scheduler.c
index 2630ff9f..b9d1aa38 100644
--- a/src/bgw/scheduler.c
+++ b/src/bgw/scheduler.c
@@ -530,10 +530,15 @@ ts_populate_scheduled_job_tuple(ScheduledBgwJob *sjob, Datum *values)
 #endif
 
 static int
+#if PG13_LT
 cmp_next_start(const void *left, const void *right)
 {
 	const ListCell *left_cell = *((ListCell **) left);
 	const ListCell *right_cell = *((ListCell **) right);
+#else
+cmp_next_start(const ListCell *left_cell, const ListCell *right_cell)
+{
+#endif
 	ScheduledBgwJob *left_sjob = lfirst(left_cell);
 	ScheduledBgwJob *right_sjob = lfirst(right_cell);
 
@@ -549,10 +554,18 @@ cmp_next_start(const void *left, const void *right)
 static void
 start_scheduled_jobs(register_background_worker_callback_type bgw_register)
 {
+	List *ordered_scheduled_jobs;
 	ListCell *lc;
 	Assert(CurrentMemoryContext == scratch_mctx);
+
 	/* Order jobs by increasing next_start */
-	List *ordered_scheduled_jobs = list_qsort(scheduled_jobs, cmp_next_start);
+#if PG13_LT
+	ordered_scheduled_jobs = list_qsort(scheduled_jobs, cmp_next_start);
+#else
+	/* PG13 does in-place sort */
+	ordered_scheduled_jobs = scheduled_jobs;
+	list_sort(ordered_scheduled_jobs, cmp_next_start);
+#endif
 
 	foreach (lc, ordered_scheduled_jobs)
 	{
-- 
2.29.2