diff --git a/plan/typeinferer.go b/plan/typeinferer.go
index a5839ce3929db..8dda61f5f92d4 100644
--- a/plan/typeinferer.go
+++ b/plan/typeinferer.go
@@ -306,7 +306,7 @@ func (v *typeInferrer) handleFuncCallExpr(x *ast.FuncCallExpr) {
 		}
 	case "str_to_date":
 		tp = types.NewFieldType(mysql.TypeDatetime)
-	case "dayname", "version", "database", "user", "current_user",
+	case "dayname", "version", "database", "user", "current_user", "schema",
 		"concat", "concat_ws", "left", "lcase", "lower", "repeat",
 		"replace", "ucase", "upper", "convert", "substring",
 		"substring_index", "trim", "ltrim", "rtrim", "reverse", "hex", "unhex", "date_format":
diff --git a/plan/typeinferer_test.go b/plan/typeinferer_test.go
index 38e6cfb38b5b1..e4129d7470301 100644
--- a/plan/typeinferer_test.go
+++ b/plan/typeinferer_test.go
@@ -120,6 +120,7 @@ func (ts *testTypeInferrerSuite) TestInferType(c *C) {
 		{"dayname('2007-02-03')", mysql.TypeVarString, "utf8"},
 		{"version()", mysql.TypeVarString, "utf8"},
 		{"database()", mysql.TypeVarString, "utf8"},
+		{"schema()", mysql.TypeVarString, "utf8"},
 		{"user()", mysql.TypeVarString, "utf8"},
 		{"current_user()", mysql.TypeVarString, "utf8"},
 		{"CONCAT('T', 'i', 'DB')", mysql.TypeVarString, "utf8"},