67 lines
2.1 KiB
Go
67 lines
2.1 KiB
Go
// Copyright 2016 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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"testing"
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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/model"
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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 _ = Suite(&testExpressionSuite{})
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func TestT(t *testing.T) {
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TestingT(t)
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}
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type testExpressionSuite struct{}
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func getColIndex(exprs []Expression, schema Schema, col *ast.ColumnName) (int, error) {
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newCol, err := schema.FindSelectFieldColumn(col, exprs)
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if err != nil {
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return -1, err
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}
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return schema.GetIndex(newCol), nil
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}
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func (s *testExpressionSuite) TestExpression(c *C) {
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defer testleak.AfterTest(c)()
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var schema Schema
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for i := 0; i < 3; i++ {
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schema = append(schema, &Column{ColName: model.NewCIStr("t"), FromID: "mock", Position: i})
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}
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tc1 := &Column{FromID: "t", ColName: model.NewCIStr("c1")}
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kc1 := &Column{FromID: "k", ColName: model.NewCIStr("c1")}
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tc2 := &Column{FromID: "t", ColName: model.NewCIStr("c2")}
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con := &Constant{Value: types.NewDatum(10)}
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col := &ast.ColumnName{Name: model.NewCIStr("t")}
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// t.c1 as t, t.c2 as t, 10 as t => error
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index, err := getColIndex([]Expression{tc1, tc2, con}, schema, col)
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c.Check(err, NotNil)
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// t.c1 as t, 10 as t, t.c2 as t => 10
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index, err = getColIndex([]Expression{tc1, con, tc2}, schema, col)
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c.Assert(index, Equals, 1)
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// t.c1 as t, t.c1 as t, 10 as t => 10
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index, err = getColIndex([]Expression{tc1, tc1, con}, schema, col)
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c.Assert(index, Equals, 2)
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// t.c1 as t, k.c1 as t, 10 as t => error
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index, err = getColIndex([]Expression{tc1, kc1, con}, schema, col)
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c.Check(err, NotNil)
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}
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