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// Copyright 2020 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 expression
import (
. "github.com/pingcap/check"
"github.com/pingcap/parser/charset"
"github.com/pingcap/parser/mysql"
"github.com/pingcap/tidb/types"
"github.com/pingcap/tidb/util/chunk"
"github.com/pingcap/tidb/util/collate"
"github.com/pingcap/tidb/util/mock"
)
var _ = SerialSuites(&testCollationSuites{})
type testCollationSuites struct{}
func (s *testCollationSuites) TestCompareString(c *C) {
collate.SetNewCollationEnabledForTest(true)
defer collate.SetNewCollationEnabledForTest(false)
c.Assert(types.CompareString("a", "A", "utf8_general_ci"), Equals, 0)
c.Assert(types.CompareString("À", "A", "utf8_general_ci"), Equals, 0)
c.Assert(types.CompareString("😜", "😃", "utf8_general_ci"), Equals, 0)
c.Assert(types.CompareString("a ", "a ", "utf8_general_ci"), Equals, 0)
c.Assert(types.CompareString("a", "A", "binary"), Not(Equals), 0)
c.Assert(types.CompareString("À", "A", "binary"), Not(Equals), 0)
c.Assert(types.CompareString("😜", "😃", "binary"), Not(Equals), 0)
c.Assert(types.CompareString("a ", "a ", "binary"), Not(Equals), 0)
ctx := mock.NewContext()
ft := types.NewFieldType(mysql.TypeVarString)
col1 := &Column{
RetType: ft,
Index: 0,
}
col2 := &Column{
RetType: ft,
Index: 1,
}
chk := chunk.NewChunkWithCapacity([]*types.FieldType{ft, ft}, 4)
chk.Column(0).AppendString("a")
chk.Column(1).AppendString("A")
chk.Column(0).AppendString("À")
chk.Column(1).AppendString("A")
chk.Column(0).AppendString("😜")
chk.Column(1).AppendString("😃")
chk.Column(0).AppendString("a ")
chk.Column(1).AppendString("a ")
for i := 0; i < 4; i++ {
v, isNull, err := CompareStringWithCollationInfo(ctx, col1, col2, chk.GetRow(0), chk.GetRow(0), "utf8_general_ci")
c.Assert(err, IsNil)
c.Assert(isNull, IsFalse)
c.Assert(v, Equals, int64(0))
}
}
func (s *testCollationSuites) TestDeriveCollationFromExprs(c *C) {
tInt := types.NewFieldType(mysql.TypeLonglong)
ctx := mock.NewContext()
// no string column
chs, coll := DeriveCollationFromExprs(ctx, newColumnWithType(0, tInt), newColumnWithType(0, tInt), newColumnWithType(0, tInt))
c.Assert(chs, Equals, charset.CharsetBin)
c.Assert(coll, Equals, charset.CollationBin)
}