From 69792adfa22ff258ee56e0684b5eab15b70424fc Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@clickhouse.com>
Date: Sat, 10 Sep 2022 05:32:23 +0200
Subject: [PATCH] Add a test for #4242

---
 .../02418_tautological_if_index.reference     |  2 ++
 .../02418_tautological_if_index.sql           | 19 +++++++++++++++++++
 2 files changed, 21 insertions(+)
 create mode 100644 tests/queries/0_stateless/02418_tautological_if_index.reference
 create mode 100644 tests/queries/0_stateless/02418_tautological_if_index.sql

diff --git a/tests/queries/0_stateless/02418_tautological_if_index.reference b/tests/queries/0_stateless/02418_tautological_if_index.reference
new file mode 100644
index 00000000000..6ed281c757a
--- /dev/null
+++ b/tests/queries/0_stateless/02418_tautological_if_index.reference
@@ -0,0 +1,2 @@
+1
+1
diff --git a/tests/queries/0_stateless/02418_tautological_if_index.sql b/tests/queries/0_stateless/02418_tautological_if_index.sql
new file mode 100644
index 00000000000..c37f24b29f6
--- /dev/null
+++ b/tests/queries/0_stateless/02418_tautological_if_index.sql
@@ -0,0 +1,19 @@
+DROP TABLE IF EXISTS constCondOptimization;
+
+CREATE TABLE constCondOptimization
+(
+    d Date DEFAULT today(),
+    time DateTime DEFAULT now(),
+    n Int64
+)
+ENGINE = MergeTree ORDER BY (time, n) SETTINGS index_granularity = 1;
+
+INSERT INTO constCondOptimization (n) SELECT number FROM system.numbers LIMIT 10000;
+
+-- The queries should use index.
+SET max_rows_to_read = 2;
+
+SELECT count() FROM constCondOptimization WHERE if(0, 1, n = 1000);
+SELECT count() FROM constCondOptimization WHERE if(0, 1, n = 1000) AND 1 = 1;
+
+DROP TABLE constCondOptimization;