From ac58f92a97baa60398181a5ec9a7d7e702dc2137 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Fri, 6 Apr 2018 08:12:47 +0300
Subject: [PATCH] Fixed error with IN where left hand side is nullable #1846

---
 dbms/src/Functions/FunctionsMiscellaneous.cpp      |  5 +++++
 .../0_stateless/00618_nullable_in.reference        |  3 +++
 .../queries/0_stateless/00618_nullable_in.sql      | 14 ++++++++++++++
 3 files changed, 22 insertions(+)
 create mode 100644 dbms/tests/queries/0_stateless/00618_nullable_in.reference
 create mode 100644 dbms/tests/queries/0_stateless/00618_nullable_in.sql

diff --git a/dbms/src/Functions/FunctionsMiscellaneous.cpp b/dbms/src/Functions/FunctionsMiscellaneous.cpp
index c7267521113..5a5fa63426f 100644
--- a/dbms/src/Functions/FunctionsMiscellaneous.cpp
+++ b/dbms/src/Functions/FunctionsMiscellaneous.cpp
@@ -729,6 +729,11 @@ public:
         return std::make_shared<DataTypeUInt8>();
     }
 
+    bool useDefaultImplementationForNulls() const override
+    {
+        return false;
+    }
+
     void executeImpl(Block & block, const ColumnNumbers & arguments, size_t result) override
     {
         /// Second argument must be ColumnSet.
diff --git a/dbms/tests/queries/0_stateless/00618_nullable_in.reference b/dbms/tests/queries/0_stateless/00618_nullable_in.reference
new file mode 100644
index 00000000000..c8eaff4e6f7
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00618_nullable_in.reference
@@ -0,0 +1,3 @@
+1
+100
+10	10	10
diff --git a/dbms/tests/queries/0_stateless/00618_nullable_in.sql b/dbms/tests/queries/0_stateless/00618_nullable_in.sql
new file mode 100644
index 00000000000..8e8c26d225d
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00618_nullable_in.sql
@@ -0,0 +1,14 @@
+SELECT sum(toNullable('a') IN 'a');
+SELECT countIf(number, toNullable('a') IN ('a', 'b')) FROM numbers(100);
+
+SELECT 
+    uniqExact(x) AS u, 
+    uniqExactIf(x, name = 'a') AS ue, 
+    uniqExactIf(x, name IN ('a', 'b')) AS ui
+FROM 
+(
+    SELECT 
+        toNullable('a') AS name, 
+        arrayJoin(range(10)) AS x
+) 
+WHERE name = 'a';