91 lines
2.9 KiB
Go
91 lines
2.9 KiB
Go
// Copyright 2015 PingCAP, Inc.
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//
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// Licensed under the Apache License, Version 2.0 (the "License");
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// you may not use this file except in compliance with the License.
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// You may obtain a copy of the License at
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//
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// http://www.apache.org/licenses/LICENSE-2.0
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//
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// Unless required by applicable law or agreed to in writing, software
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// distributed under the License is distributed on an "AS IS" BASIS,
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// See the License for the specific language governing permissions and
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// limitations under the License.
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package expression
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import (
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"github.com/pingcap/check"
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"github.com/pingcap/tidb/ast"
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"github.com/pingcap/tidb/mysql"
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"github.com/pingcap/tidb/util/mock"
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"github.com/pingcap/tidb/util/testleak"
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"github.com/pingcap/tidb/util/types"
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)
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var _ = check.Suite(&testUtilSuite{})
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type testUtilSuite struct {
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}
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func (s *testUtilSuite) TestDistinct(c *check.C) {
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defer testleak.AfterTest(c)()
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dc := createDistinctChecker()
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tests := []struct {
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vals []interface{}
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expect bool
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}{
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{[]interface{}{1, 1}, true},
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{[]interface{}{1, 1}, false},
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{[]interface{}{1, 2}, true},
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{[]interface{}{1, 2}, false},
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{[]interface{}{1, nil}, true},
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{[]interface{}{1, nil}, false},
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}
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for _, tt := range tests {
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d, err := dc.Check(types.MakeDatums(tt.vals...))
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c.Assert(err, check.IsNil)
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c.Assert(d, check.Equals, tt.expect)
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}
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}
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func (s *testUtilSuite) TestSubstituteCorCol2Constant(c *check.C) {
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defer testleak.AfterTest(c)()
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ctx := mock.NewContext()
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corCol1 := &CorrelatedColumn{Data: &One.Value}
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corCol2 := &CorrelatedColumn{Data: &One.Value}
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cast := NewCastFunc(types.NewFieldType(mysql.TypeLonglong), corCol1, ctx)
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plus := newFunction(ast.Plus, cast, corCol2)
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plus2 := newFunction(ast.Plus, plus, One)
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ans1 := &Constant{Value: types.NewIntDatum(3), RetType: types.NewFieldType(mysql.TypeLonglong)}
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ret, err := SubstituteCorCol2Constant(plus2)
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c.Assert(err, check.IsNil)
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c.Assert(ret.Equal(ans1, ctx), check.IsTrue)
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col1 := &Column{Index: 1}
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ret, err = SubstituteCorCol2Constant(col1)
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c.Assert(err, check.IsNil)
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ans2 := col1
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c.Assert(ret.Equal(ans2, ctx), check.IsTrue)
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plus3 := newFunction(ast.Plus, plus2, col1)
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ret, err = SubstituteCorCol2Constant(plus3)
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c.Assert(err, check.IsNil)
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ans3 := newFunction(ast.Plus, ans1, col1)
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c.Assert(ret.Equal(ans3, ctx), check.IsTrue)
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}
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func (s *testUtilSuite) TestPushDownNot(c *check.C) {
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defer testleak.AfterTest(c)()
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ctx := mock.NewContext()
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col := &Column{Index: 1}
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// !((a=1||a=1)&&a=1)
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eqFunc := newFunction(ast.EQ, col, One)
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orFunc := newFunction(ast.OrOr, eqFunc, eqFunc)
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andFunc := newFunction(ast.AndAnd, orFunc, eqFunc)
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notFunc := newFunction(ast.UnaryNot, andFunc)
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// (a!=1&&a!=1)||a=1
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neFunc := newFunction(ast.NE, col, One)
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andFunc2 := newFunction(ast.AndAnd, neFunc, neFunc)
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orFunc2 := newFunction(ast.OrOr, andFunc2, neFunc)
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ret := PushDownNot(notFunc, false, ctx)
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c.Assert(ret.Equal(orFunc2, ctx), check.IsTrue)
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}
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