4b5f87c98a
Dual is a dummy table, `select 1, 2` is equivalent to `select 1, 2 from dual`, and dual is widely known.
134 lines
3.0 KiB
Go
134 lines
3.0 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 plans_test
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import (
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. "github.com/pingcap/check"
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"github.com/pingcap/tidb/expression"
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"github.com/pingcap/tidb/field"
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"github.com/pingcap/tidb/model"
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"github.com/pingcap/tidb/plan/plans"
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"github.com/pingcap/tidb/rset/rsets"
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"github.com/pingcap/tidb/util/mock"
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)
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type testFieldsSuit struct{}
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var _ = Suite(&testFieldsSuit{})
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var selectFieldsTestData = []*testRowData{
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{1, []interface{}{10, "hello"}},
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{2, []interface{}{20, "hello"}},
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{3, []interface{}{30, "hello"}},
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{4, []interface{}{40, "hello"}},
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{5, []interface{}{50, "hello"}},
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{6, []interface{}{60, "hello"}},
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}
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func (s *testFieldsSuit) TestDefaultFieldsPlan(c *C) {
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tblPlan := &testTablePlan{selectFieldsTestData, []string{"id", "name"}, 0}
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sl1 := &plans.SelectList{
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Fields: []*field.Field{
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{
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Expr: &expression.Ident{
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CIStr: model.NewCIStr("name"),
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},
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},
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},
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}
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selFieldsPlan := &plans.SelectFieldsDefaultPlan{
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SelectList: sl1,
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Src: tblPlan,
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}
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rset := rsets.Recordset{
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Plan: selFieldsPlan,
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Ctx: mock.NewContext(),
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}
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rset.Do(func(data []interface{}) (bool, error) {
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c.Assert(len(data), Equals, 1)
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c.Assert(data[0].(string), Equals, "hello")
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return true, nil
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})
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// test multiple fields
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sl2 := &plans.SelectList{
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Fields: []*field.Field{
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{
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Expr: &expression.Ident{
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CIStr: model.NewCIStr("name"),
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},
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},
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{
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Expr: &expression.Ident{
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CIStr: model.NewCIStr("id"),
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},
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},
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},
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}
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tblPlan.Close()
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rset.Plan = &plans.SelectFieldsDefaultPlan{
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SelectList: sl2,
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Src: tblPlan,
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}
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rset.Do(func(data []interface{}) (bool, error) {
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c.Assert(len(data), Equals, 2)
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c.Assert(data[0].(string), Equals, "hello")
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c.Assert(data[1].(int), GreaterEqual, 10)
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return true, nil
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})
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// test field doesn't exists
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sl3 := &plans.SelectList{
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Fields: []*field.Field{
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{
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Expr: &expression.Ident{
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CIStr: model.NewCIStr("nosuchfield"),
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},
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},
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},
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}
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tblPlan.Close()
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rset.Plan = &plans.SelectFieldsDefaultPlan{
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SelectList: sl3,
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Src: tblPlan,
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}
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err := rset.Do(func(data []interface{}) (bool, error) {
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return true, nil
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})
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c.Assert(err.Error() == "unknown field nosuchfield", Equals, true)
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}
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func (s *testFieldsSuit) TestSelectExprPlan(c *C) {
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pln := &plans.SelectFromDualPlan{
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Fields: []*field.Field{
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{
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Expr: &expression.Value{
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Val: "data",
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},
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},
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},
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}
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fields := pln.GetFields()
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c.Assert(fields, HasLen, 1)
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rset := rsets.Recordset{
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Plan: pln,
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Ctx: mock.NewContext()}
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rset.Do(func(data []interface{}) (bool, error) {
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return true, nil
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})
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}
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