From 4c7923e6dff96fed33939d7c342b865811ea0228 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Mon, 15 Feb 2021 05:17:30 +0300
Subject: [PATCH] Add a test for #10893

---
 .../0_stateless/01719_join_timezone.reference |  3 ++
 .../0_stateless/01719_join_timezone.sql       | 45 +++++++++++++++++++
 2 files changed, 48 insertions(+)
 create mode 100644 tests/queries/0_stateless/01719_join_timezone.reference
 create mode 100644 tests/queries/0_stateless/01719_join_timezone.sql

diff --git a/tests/queries/0_stateless/01719_join_timezone.reference b/tests/queries/0_stateless/01719_join_timezone.reference
new file mode 100644
index 00000000000..c2702a38012
--- /dev/null
+++ b/tests/queries/0_stateless/01719_join_timezone.reference
@@ -0,0 +1,3 @@
+2020-05-13 13:38:45	2020-05-13 16:38:45
+2020-05-13 13:38:45	2020-05-13 16:38:45
+2020-05-13 13:38:45	2020-05-13 16:38:45
diff --git a/tests/queries/0_stateless/01719_join_timezone.sql b/tests/queries/0_stateless/01719_join_timezone.sql
new file mode 100644
index 00000000000..cbf0c27fcfc
--- /dev/null
+++ b/tests/queries/0_stateless/01719_join_timezone.sql
@@ -0,0 +1,45 @@
+DROP TABLE IF EXISTS test;
+
+CREATE TABLE test (timestamp DateTime('UTC'), i UInt8) Engine=MergeTree() PARTITION BY toYYYYMM(timestamp) ORDER BY (i);
+INSERT INTO test values ('2020-05-13 16:38:45', 1);
+
+SELECT
+    toTimeZone(timestamp, 'America/Sao_Paulo') AS converted,
+    timestamp AS original
+FROM test
+LEFT JOIN (SELECT 2 AS x) AS anything ON x = i
+WHERE timestamp >= toDateTime('2020-05-13T00:00:00', 'America/Sao_Paulo');
+
+/* This was incorrect result in previous ClickHouse versions:
+┌─converted───────────┬─original────────────┐
+│ 2020-05-13 16:38:45 │ 2020-05-13 16:38:45 │ <-- toTimeZone is ignored.
+└─────────────────────┴─────────────────────┘
+*/
+
+SELECT
+    toTimeZone(timestamp, 'America/Sao_Paulo') AS converted,
+    timestamp AS original
+FROM test
+-- LEFT JOIN (SELECT 2 AS x) AS anything ON x = i -- Removing the join fixes the issue.
+WHERE timestamp >= toDateTime('2020-05-13T00:00:00', 'America/Sao_Paulo');
+
+/*
+┌─converted───────────┬─original────────────┐
+│ 2020-05-13 13:38:45 │ 2020-05-13 16:38:45 │ <-- toTimeZone works.
+└─────────────────────┴─────────────────────┘
+*/
+
+SELECT
+    toTimeZone(timestamp, 'America/Sao_Paulo') AS converted,
+    timestamp AS original
+FROM test
+LEFT JOIN (SELECT 2 AS x) AS anything ON x = i
+WHERE timestamp >= '2020-05-13T00:00:00'; -- Not using toDateTime in the WHERE also fixes the issue.
+
+/*
+┌─converted───────────┬─original────────────┐
+│ 2020-05-13 13:38:45 │ 2020-05-13 16:38:45 │ <-- toTimeZone works.
+└─────────────────────┴─────────────────────┘
+*/
+
+DROP TABLE test;