You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.4 KiB
45 lines
1.4 KiB
// Copyright 2018 PingCAP, Inc.
|
|
//
|
|
// Licensed under the Apache License, Version 2.0 (the "License");
|
|
// you may not use this file except in compliance with the License.
|
|
// You may obtain a copy of the License at
|
|
//
|
|
// http://www.apache.org/licenses/LICENSE-2.0
|
|
//
|
|
// Unless required by applicable law or agreed to in writing, software
|
|
// distributed under the License is distributed on an "AS IS" BASIS,
|
|
// See the License for the specific language governing permissions and
|
|
// limitations under the License.
|
|
|
|
package memo
|
|
|
|
import (
|
|
"encoding/binary"
|
|
"reflect"
|
|
|
|
. "github.com/pingcap/check"
|
|
"github.com/pingcap/tidb/expression"
|
|
plannercore "github.com/pingcap/tidb/planner/core"
|
|
)
|
|
|
|
func (s *testMemoSuite) TestNewGroupExpr(c *C) {
|
|
p := &plannercore.LogicalLimit{}
|
|
expr := NewGroupExpr(p)
|
|
c.Assert(expr.ExprNode, Equals, p)
|
|
c.Assert(expr.Children, IsNil)
|
|
c.Assert(expr.Explored(0), IsFalse)
|
|
}
|
|
|
|
func (s *testMemoSuite) TestGroupExprFingerprint(c *C) {
|
|
p := &plannercore.LogicalLimit{Count: 3}
|
|
expr := NewGroupExpr(p)
|
|
childGroup := NewGroupWithSchema(nil, expression.NewSchema())
|
|
expr.SetChildren(childGroup)
|
|
// ChildNum(2 bytes) + ChildPointer(8 bytes) + LogicalLimit HashCode
|
|
planHash := p.HashCode()
|
|
buffer := make([]byte, 10+len(planHash))
|
|
binary.BigEndian.PutUint16(buffer, 1)
|
|
binary.BigEndian.PutUint64(buffer[2:], uint64(reflect.ValueOf(childGroup).Pointer()))
|
|
copy(buffer[10:], planHash)
|
|
c.Assert(expr.FingerPrint(), Equals, string(buffer))
|
|
}
|
|
|