78 lines
2.7 KiB
Go
78 lines
2.7 KiB
Go
// Copyright 2017 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/model"
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"github.com/pingcap/tidb/mysql"
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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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func (s *testEvaluatorSuite) TestNewCastFunc(c *C) {
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defer testleak.AfterTest(c)()
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res := NewCastFunc(types.NewFieldType(mysql.TypeJSON), &Column{RetType: types.NewFieldType(mysql.TypeLonglong)}, s.ctx)
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castFunc := res.(*ScalarFunction)
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c.Assert(castFunc.FuncName.L, Equals, "cast")
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c.Assert(castFunc.RetType.Tp, Equals, mysql.TypeJSON)
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_, ok := castFunc.Function.(*builtinCastSig)
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c.Assert(ok, IsTrue)
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}
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func (s *testEvaluatorSuite) TestNewValuesFunc(c *C) {
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defer testleak.AfterTest(c)()
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res := NewValuesFunc(0, types.NewFieldType(mysql.TypeLonglong), s.ctx)
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c.Assert(res.FuncName.O, Equals, "values")
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c.Assert(res.RetType.Tp, Equals, mysql.TypeLonglong)
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_, ok := res.Function.(*builtinValuesSig)
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c.Assert(ok, IsTrue)
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}
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func (s *testEvaluatorSuite) TestEvaluateExprWithNull(c *C) {
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defer testleak.AfterTest(c)()
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col0 := &Column{RetType: types.NewFieldType(mysql.TypeLonglong), FromID: "DataSource_0", Position: 0, ColName: model.NewCIStr("col0")}
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col1 := &Column{RetType: types.NewFieldType(mysql.TypeLonglong), FromID: "DataSource_0", Position: 1, ColName: model.NewCIStr("col1")}
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ifnullInner := newFunction(ast.Ifnull, col1, One)
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ifnullOuter := newFunction(ast.Ifnull, col0, ifnullInner)
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// ifnull(null, ifnull(col1, 1))
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schema := &Schema{Columns: []*Column{col0}}
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res, err := EvaluateExprWithNull(s.ctx, schema, ifnullOuter)
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c.Assert(err, IsNil)
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c.Assert(res.String(), Equals, "ifnull(<nil>, ifnull(col1, 1))")
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schema.Columns = append(schema.Columns, col1)
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// ifnull(null, ifnull(null, 1))
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res, err = EvaluateExprWithNull(s.ctx, schema, ifnullOuter)
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c.Assert(err, IsNil)
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c.Assert(res.Equal(One, s.ctx), IsTrue)
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}
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func (s *testEvaluatorSuite) TestConstant(c *C) {
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defer testleak.AfterTest(c)()
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c.Assert(Zero.IsCorrelated(), IsFalse)
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c.Assert(Zero.Decorrelate(nil).Equal(Zero, s.ctx), IsTrue)
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c.Assert(Zero.HashCode(), DeepEquals, []byte{0x8, 0x0})
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c.Assert(Zero.Equal(One, s.ctx), IsFalse)
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res, err := Zero.MarshalJSON()
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c.Assert(err, IsNil)
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c.Assert(res, DeepEquals, []byte{0x22, 0x30, 0x22})
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}
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