From 86897e0c47eabf2c5026bf3ea620bed7678f179f Mon Sep 17 00:00:00 2001
From: tiancaiamao <tiancaiamao@gmail.com>
Date: Tue, 30 Jan 2018 02:47:00 -0600
Subject: [PATCH] ast: do statement is read only (#5752)

---
 ast/read_only_checker.go      | 2 +-
 ast/read_only_checker_test.go | 3 +++
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/ast/read_only_checker.go b/ast/read_only_checker.go
index aa0e49f02fccb..99c48f5800fad 100644
--- a/ast/read_only_checker.go
+++ b/ast/read_only_checker.go
@@ -27,7 +27,7 @@ func IsReadOnly(node Node) bool {
 
 		node.Accept(&checker)
 		return checker.readOnly
-	case *ExplainStmt:
+	case *ExplainStmt, *DoStmt:
 		return true
 	default:
 		return false
diff --git a/ast/read_only_checker_test.go b/ast/read_only_checker_test.go
index 0b56b4d85d388..7abd27f066fe5 100644
--- a/ast/read_only_checker_test.go
+++ b/ast/read_only_checker_test.go
@@ -38,4 +38,7 @@ func (s *testCacheableSuite) TestCacheable(c *C) {
 
 	stmt = &ExplainStmt{}
 	c.Assert(IsReadOnly(stmt), IsTrue)
+
+	stmt = &DoStmt{}
+	c.Assert(IsReadOnly(stmt), IsTrue)
 }