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// 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 cascades
import (
. "github.com/pingcap/check"
"github.com/pingcap/tidb/expression"
"github.com/pingcap/tidb/planner/memo"
"github.com/pingcap/tidb/planner/property"
)
func (s *testCascadesSuite) TestGetEnforcerRules(c *C) {
prop := &property.PhysicalProperty{}
group := memo.NewGroupWithSchema(nil, expression.NewSchema())
enforcers := GetEnforcerRules(group, prop)
c.Assert(enforcers, IsNil)
col := &expression.Column{}
prop.Items = append(prop.Items, property.Item{Col: col})
enforcers = GetEnforcerRules(group, prop)
c.Assert(enforcers, NotNil)
c.Assert(len(enforcers), Equals, 1)
_, ok := enforcers[0].(*OrderEnforcer)
c.Assert(ok, IsTrue)
}
func (s *testCascadesSuite) TestNewProperties(c *C) {
prop := &property.PhysicalProperty{}
col := &expression.Column{}
group := memo.NewGroupWithSchema(nil, expression.NewSchema())
prop.Items = append(prop.Items, property.Item{Col: col})
enforcers := GetEnforcerRules(group, prop)
orderEnforcer, _ := enforcers[0].(*OrderEnforcer)
newProp := orderEnforcer.NewProperty(prop)
c.Assert(newProp.Items, IsNil)
}