parser: support for flush status

ast/misc.go

@@ -339,6 +339,7 @@ const (
 	FlushNone FlushStmtType = iota
 	FlushTables
 	FlushPrivileges
+	FlushStatus
 )
 
 // FlushStmt is a statement to flush tables/privileges/optimizer costs and so on.

parser/parser.y

@@ -5518,6 +5518,12 @@ FlushOption:
 			Tp: ast.FlushPrivileges,
 		}
 	}
+|	"STATUS"
+	{
+		$$ = &ast.FlushStmt{
+			Tp: ast.FlushStatus,
+		}
+	}
 |	TableOrTables TableNameListOpt WithReadLockOpt
 	{
 		$$ = &ast.FlushStmt{

parser/parser_test.go

@@ -618,6 +618,7 @@ func (s *testParserSuite) TestDBAStmt(c *C) {
 		{"flush tables tbl1, tbl2, tbl3", true},
 		{"flush tables tbl1, tbl2, tbl3 with read lock", true},
 		{"flush privileges", true},
+		{"flush status", true},
 	}
 	s.RunTest(c, table)
 }