From dec3e0f9861f7876ee8a9dd3a97b9f88240cd284 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Sun, 12 Apr 2020 03:38:25 +0300
Subject: [PATCH] Make least and greatest functions case insensitive for
 compatibility with MySQL

---
 src/Functions/greatest.cpp                                    | 2 +-
 src/Functions/least.cpp                                       | 2 +-
 tests/queries/0_stateless/01117_greatest_least_case.reference | 2 ++
 tests/queries/0_stateless/01117_greatest_least_case.sql       | 2 ++
 4 files changed, 6 insertions(+), 2 deletions(-)
 create mode 100644 tests/queries/0_stateless/01117_greatest_least_case.reference
 create mode 100644 tests/queries/0_stateless/01117_greatest_least_case.sql

diff --git a/src/Functions/greatest.cpp b/src/Functions/greatest.cpp
index 6eb123708a4..9abf85e751b 100644
--- a/src/Functions/greatest.cpp
+++ b/src/Functions/greatest.cpp
@@ -57,7 +57,7 @@ using FunctionGreatest = FunctionBinaryArithmetic<GreatestImpl, NameGreatest>;
 
 void registerFunctionGreatest(FunctionFactory & factory)
 {
-    factory.registerFunction<FunctionGreatest>();
+    factory.registerFunction<FunctionGreatest>(FunctionFactory::CaseInsensitive);
 }
 
 }
diff --git a/src/Functions/least.cpp b/src/Functions/least.cpp
index 47af759c956..f2e7c1f15d2 100644
--- a/src/Functions/least.cpp
+++ b/src/Functions/least.cpp
@@ -57,7 +57,7 @@ using FunctionLeast = FunctionBinaryArithmetic<LeastImpl, NameLeast>;
 
 void registerFunctionLeast(FunctionFactory & factory)
 {
-    factory.registerFunction<FunctionLeast>();
+    factory.registerFunction<FunctionLeast>(FunctionFactory::CaseInsensitive);
 }
 
 }
diff --git a/tests/queries/0_stateless/01117_greatest_least_case.reference b/tests/queries/0_stateless/01117_greatest_least_case.reference
new file mode 100644
index 00000000000..4bbcfcf5682
--- /dev/null
+++ b/tests/queries/0_stateless/01117_greatest_least_case.reference
@@ -0,0 +1,2 @@
+2
+-1
diff --git a/tests/queries/0_stateless/01117_greatest_least_case.sql b/tests/queries/0_stateless/01117_greatest_least_case.sql
new file mode 100644
index 00000000000..21bfd240f5a
--- /dev/null
+++ b/tests/queries/0_stateless/01117_greatest_least_case.sql
@@ -0,0 +1,2 @@
+SELECT GREATEST(1, 2);
+SELECT LEAST(1, -1);