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plan: fix a bug when using correlated column as index (#7357)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,195 @@ | ||
| // Copyright 2018 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 col1 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 plan | ||
|
|
||
| import ( | ||
| "fmt" | ||
|
|
||
| "github.com/juju/errors" | ||
| . "github.com/pingcap/check" | ||
| "github.com/pingcap/tidb/ast" | ||
| "github.com/pingcap/tidb/expression" | ||
| "github.com/pingcap/tidb/model" | ||
| "github.com/pingcap/tidb/mysql" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/testleak" | ||
| ) | ||
|
|
||
| var _ = Suite(&testUnitTestSuit{}) | ||
|
|
||
| type testUnitTestSuit struct { | ||
| ctx sessionctx.Context | ||
| } | ||
|
|
||
| func (s *testUnitTestSuit) SetUpSuite(c *C) { | ||
| s.ctx = mockContext() | ||
| } | ||
|
|
||
| func (s *testUnitTestSuit) newTypeWithFlen(typeByte byte, flen int) *types.FieldType { | ||
| tp := types.NewFieldType(typeByte) | ||
| tp.Flen = flen | ||
| return tp | ||
| } | ||
|
|
||
| func (s *testUnitTestSuit) SubstituteCol2CorCol(expr expression.Expression, colIDs map[int]struct{}) (expression.Expression, error) { | ||
| switch x := expr.(type) { | ||
| case *expression.ScalarFunction: | ||
| newArgs := make([]expression.Expression, 0, len(x.GetArgs())) | ||
| for _, arg := range x.GetArgs() { | ||
| newArg, err := s.SubstituteCol2CorCol(arg, colIDs) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| newArgs = append(newArgs, newArg) | ||
| } | ||
| newSf, err := expression.NewFunction(x.GetCtx(), x.FuncName.L, x.GetType(), newArgs...) | ||
| return newSf, errors.Trace(err) | ||
| case *expression.Column: | ||
| if _, ok := colIDs[x.UniqueID]; ok { | ||
| return &expression.CorrelatedColumn{Column: *x}, nil | ||
| } | ||
| } | ||
| return expr, nil | ||
| } | ||
|
|
||
| func (s *testUnitTestSuit) TestIndexPathSplitCorColCond(c *C) { | ||
| defer testleak.AfterTest(c)() | ||
| totalSchema := expression.NewSchema() | ||
| totalSchema.Append(&expression.Column{ | ||
| ColName: model.NewCIStr("col1"), | ||
| UniqueID: 1, | ||
| RetType: types.NewFieldType(mysql.TypeLonglong), | ||
| }) | ||
| totalSchema.Append(&expression.Column{ | ||
| ColName: model.NewCIStr("col2"), | ||
| UniqueID: 2, | ||
| RetType: types.NewFieldType(mysql.TypeLonglong), | ||
| }) | ||
| totalSchema.Append(&expression.Column{ | ||
| ColName: model.NewCIStr("col3"), | ||
| UniqueID: 3, | ||
| RetType: s.newTypeWithFlen(mysql.TypeVarchar, 10), | ||
| }) | ||
| totalSchema.Append(&expression.Column{ | ||
| ColName: model.NewCIStr("col4"), | ||
| UniqueID: 4, | ||
| RetType: s.newTypeWithFlen(mysql.TypeVarchar, 10), | ||
| }) | ||
| totalSchema.Append(&expression.Column{ | ||
| ColName: model.NewCIStr("col5"), | ||
| UniqueID: 5, | ||
| RetType: types.NewFieldType(mysql.TypeLonglong), | ||
| }) | ||
| testCases := []struct { | ||
| expr string | ||
| corColIDs []int | ||
| idxColIDs []int | ||
| idxColLens []int | ||
| access string | ||
| remained string | ||
| }{ | ||
| { | ||
| expr: "col1 = col2", | ||
| corColIDs: []int{2}, | ||
| idxColIDs: []int{1}, | ||
| idxColLens: []int{types.UnspecifiedLength}, | ||
| access: "[eq(col1, col2)]", | ||
| remained: "[]", | ||
| }, | ||
| { | ||
| expr: "col1 = col5 and col2 = 1", | ||
| corColIDs: []int{5}, | ||
| idxColIDs: []int{1, 2}, | ||
| idxColLens: []int{types.UnspecifiedLength, types.UnspecifiedLength}, | ||
| access: "[eq(col1, col5) eq(col2, 1)]", | ||
| remained: "[]", | ||
| }, | ||
| { | ||
| expr: "col1 = col5 and col2 = 1", | ||
| corColIDs: []int{5}, | ||
| idxColIDs: []int{2, 1}, | ||
| idxColLens: []int{types.UnspecifiedLength, types.UnspecifiedLength}, | ||
| access: "[eq(col2, 1) eq(col1, col5)]", | ||
| remained: "[]", | ||
| }, | ||
| { | ||
| expr: "col1 = col5 and col2 = 1", | ||
| corColIDs: []int{5}, | ||
| idxColIDs: []int{1}, | ||
| idxColLens: []int{types.UnspecifiedLength}, | ||
| access: "[eq(col1, col5)]", | ||
| remained: "[eq(col2, 1)]", | ||
| }, | ||
| { | ||
| expr: "col2 = 1 and col1 = col5", | ||
| corColIDs: []int{5}, | ||
| idxColIDs: []int{1}, | ||
| idxColLens: []int{types.UnspecifiedLength}, | ||
| access: "[eq(col1, col5)]", | ||
| remained: "[eq(col2, 1)]", | ||
| }, | ||
| { | ||
| expr: "col1 = col2 and col3 = col4 and col5 = 1", | ||
| corColIDs: []int{2, 4}, | ||
| idxColIDs: []int{1, 3}, | ||
| idxColLens: []int{types.UnspecifiedLength, types.UnspecifiedLength}, | ||
| access: "[eq(col1, col2) eq(col3, col4)]", | ||
| remained: "[eq(col5, 1)]", | ||
| }, | ||
| { | ||
| expr: "col1 = col2 and col3 = col4 and col5 = 1", | ||
| corColIDs: []int{2, 4}, | ||
| idxColIDs: []int{1, 3}, | ||
| idxColLens: []int{types.UnspecifiedLength, 2}, | ||
| access: "[eq(col1, col2) eq(col3, col4)]", | ||
| remained: "[eq(col3, col4) eq(col5, 1)]", | ||
| }, | ||
| { | ||
| expr: `col1 = col5 and col3 = "col1" and col2 = col5`, | ||
| corColIDs: []int{5}, | ||
| idxColIDs: []int{1, 2, 3}, | ||
| idxColLens: []int{types.UnspecifiedLength, types.UnspecifiedLength, types.UnspecifiedLength}, | ||
| access: "[eq(col1, col5) eq(col2, col5) eq(col3, col1)]", | ||
| remained: "[]", | ||
| }, | ||
| } | ||
| for _, tt := range testCases { | ||
| comment := Commentf("failed at case:\nexpr: %v\ncorColIDs: %v\nidxColIDs: %v\nidxColLens: %v\naccess: %v\nremained: %v\n", tt.expr, tt.corColIDs, tt.idxColIDs, tt.idxColLens, tt.access, tt.remained) | ||
| filters, err := expression.ParseSimpleExprsWithSchema(s.ctx, tt.expr, totalSchema) | ||
| if sf, ok := filters[0].(*expression.ScalarFunction); ok && sf.FuncName.L == ast.LogicAnd { | ||
| filters = expression.FlattenCNFConditions(sf) | ||
| } | ||
| c.Assert(err, IsNil, comment) | ||
| trueFilters := make([]expression.Expression, 0, len(filters)) | ||
| idMap := make(map[int]struct{}) | ||
| for _, id := range tt.corColIDs { | ||
| idMap[id] = struct{}{} | ||
| } | ||
| for _, filter := range filters { | ||
| trueFilter, err := s.SubstituteCol2CorCol(filter, idMap) | ||
| c.Assert(err, IsNil, comment) | ||
| trueFilters = append(trueFilters, trueFilter) | ||
| } | ||
| path := accessPath{ | ||
| eqCondCount: 0, | ||
| tableFilters: trueFilters, | ||
| idxCols: expression.FindColumnsByUniqueIDs(totalSchema.Columns, tt.idxColIDs), | ||
| idxColLens: tt.idxColLens, | ||
| } | ||
| access, remained := path.splitCorColAccessCondFromFilters() | ||
| c.Assert(fmt.Sprintf("%s", access), Equals, tt.access, comment) | ||
| c.Assert(fmt.Sprintf("%s", remained), Equals, tt.remained, comment) | ||
| } | ||
| } |