From 2c815356c1c2a226681610edfd8436f38e2a78a8 Mon Sep 17 00:00:00 2001
From: Alexey Milovidov <milovidov@yandex-team.ru>
Date: Thu, 27 Jul 2017 22:25:52 +0300
Subject: [PATCH] Fixed regression in parsing of CAST [#CLICKHOUSE-3180].

---
 dbms/src/Parsers/ExpressionElementParsers.cpp              | 4 ++++
 dbms/tests/queries/0_stateless/00483_cast_syntax.reference | 2 ++
 dbms/tests/queries/0_stateless/00483_cast_syntax.sql       | 2 ++
 3 files changed, 8 insertions(+)
 create mode 100644 dbms/tests/queries/0_stateless/00483_cast_syntax.reference
 create mode 100644 dbms/tests/queries/0_stateless/00483_cast_syntax.sql

diff --git a/dbms/src/Parsers/ExpressionElementParsers.cpp b/dbms/src/Parsers/ExpressionElementParsers.cpp
index fa43d5fba01..34198b58fd5 100644
--- a/dbms/src/Parsers/ExpressionElementParsers.cpp
+++ b/dbms/src/Parsers/ExpressionElementParsers.cpp
@@ -300,6 +300,8 @@ bool ParserCastExpression::parseImpl(Pos & pos, ASTPtr & node, Expected & expect
         return false;
 
     const auto & id = typeid_cast<const ASTIdentifier &>(*identifier).name;
+
+    /// TODO This is ridiculous. Please get rid of this.
     if (id.length() != strlen(name) || 0 != strcasecmp(id.c_str(), name))
     {
         /// Parse as a CASE expression.
@@ -340,6 +342,8 @@ bool ParserCastExpression::parseImpl(Pos & pos, ASTPtr & node, Expected & expect
     }
     else
     {
+        pos = contents_begin;
+
         /// CAST(expression, 'type')
         /// Reparse argument list from scratch
         ParserExpressionWithOptionalAlias expression{false};
diff --git a/dbms/tests/queries/0_stateless/00483_cast_syntax.reference b/dbms/tests/queries/0_stateless/00483_cast_syntax.reference
new file mode 100644
index 00000000000..6ed281c757a
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00483_cast_syntax.reference
@@ -0,0 +1,2 @@
+1
+1
diff --git a/dbms/tests/queries/0_stateless/00483_cast_syntax.sql b/dbms/tests/queries/0_stateless/00483_cast_syntax.sql
new file mode 100644
index 00000000000..be248fce394
--- /dev/null
+++ b/dbms/tests/queries/0_stateless/00483_cast_syntax.sql
@@ -0,0 +1,2 @@
+SELECT CAST(1 AS Int8);
+SELECT CAST(1, 'Int8');