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Skip optimizer and coprocessor for point select.
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,181 @@ | ||
| // 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 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 executor | ||
|
|
||
| import ( | ||
| "github.com/juju/errors" | ||
| "github.com/pingcap/tidb/expression" | ||
| "github.com/pingcap/tidb/kv" | ||
| "github.com/pingcap/tidb/model" | ||
| "github.com/pingcap/tidb/mysql" | ||
| "github.com/pingcap/tidb/plan" | ||
| "github.com/pingcap/tidb/sessionctx" | ||
| "github.com/pingcap/tidb/table" | ||
| "github.com/pingcap/tidb/table/tables" | ||
| "github.com/pingcap/tidb/tablecodec" | ||
| "github.com/pingcap/tidb/types" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| "github.com/pingcap/tidb/util/codec" | ||
| "golang.org/x/net/context" | ||
| ) | ||
|
|
||
| func (b *executorBuilder) buildPointSelect(p *plan.PointSelectPlan) Executor { | ||
| return &PointSelectExecutor{ | ||
| ctx: b.ctx, | ||
| schema: p.Schema(), | ||
| tblInfo: p.TblInfo, | ||
| idxInfo: p.IndexInfo, | ||
| idxVals: p.IndexValues, | ||
| handle: p.Handle, | ||
| startTS: b.getStartTS(), | ||
| } | ||
| } | ||
|
|
||
| type PointSelectExecutor struct { | ||
| ctx sessionctx.Context | ||
| schema *expression.Schema | ||
| tps []*types.FieldType | ||
| tblInfo *model.TableInfo | ||
| handle int64 | ||
| idxInfo *model.IndexInfo | ||
| idxVals []types.Datum | ||
| startTS uint64 | ||
| snapshot kv.Snapshot | ||
| done bool | ||
| } | ||
|
|
||
| func (e *PointSelectExecutor) Open(context.Context) error { | ||
| return nil | ||
| } | ||
|
|
||
| func (e *PointSelectExecutor) Close() error { | ||
| return nil | ||
| } | ||
|
|
||
| func (e *PointSelectExecutor) Next(ctx context.Context, chk *chunk.Chunk) error { | ||
| chk.Reset() | ||
| if e.done { | ||
| return nil | ||
| } | ||
| e.done = true | ||
| snapshot, err := e.ctx.GetStore().GetSnapshot(kv.Version{Ver: e.startTS}) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| e.snapshot = snapshot | ||
| if e.idxInfo != nil { | ||
| for i := range e.idxVals { | ||
| colInfo := e.tblInfo.Columns[e.idxInfo.Columns[i].Offset] | ||
| casted, err := table.CastValue(e.ctx, e.idxVals[i], colInfo) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| e.idxVals[i] = casted | ||
| } | ||
| encodedIdxVals, err := codec.EncodeKey(e.ctx.GetSessionVars().StmtCtx, nil, e.idxVals...) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| idxKey := tablecodec.EncodeIndexSeekKey(e.tblInfo.ID, e.idxInfo.ID, encodedIdxVals) | ||
| handleVal, err := e.get(idxKey) | ||
| if err != nil && !kv.ErrNotExist.Equal(err) { | ||
| return errors.Trace(err) | ||
| } | ||
| if len(handleVal) == 0 { | ||
| return nil | ||
| } | ||
| h, err := tables.DecodeHandle(handleVal) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| e.handle = h | ||
| } | ||
| key := tablecodec.EncodeRowKeyWithHandle(e.tblInfo.ID, e.handle) | ||
| val, err := e.get(key) | ||
| if err != nil && !kv.ErrNotExist.Equal(err) { | ||
| return errors.Trace(err) | ||
| } | ||
| if len(val) == 0 { | ||
| return nil | ||
| } | ||
| colIDs := make(map[int64]int) | ||
| for i, col := range e.schema.Columns { | ||
| colIDs[col.ID] = i | ||
| } | ||
| colVals, err := tablecodec.CutRowNew(val, colIDs) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| decoder := codec.NewDecoder(chk, e.ctx.GetSessionVars().GetTimeZone()) | ||
| for id, offset := range colIDs { | ||
| if e.tblInfo.PKIsHandle && mysql.HasPriKeyFlag(e.schema.Columns[offset].RetType.Flag) { | ||
| chk.AppendInt64(offset, e.handle) | ||
| continue | ||
| } | ||
| if id == model.ExtraHandleID { | ||
| chk.AppendInt64(offset, e.handle) | ||
| continue | ||
| } | ||
| colVal := colVals[offset] | ||
| if len(colVal) == 0 { | ||
| colInfo := getColInfoByID(e.tblInfo, id) | ||
| d, err1 := table.GetColOriginDefaultValue(e.ctx, colInfo) | ||
| if err1 != nil { | ||
| return errors.Trace(err1) | ||
| } | ||
| chk.AppendDatum(offset, &d) | ||
| continue | ||
| } | ||
| _, err = decoder.DecodeOne(colVals[offset], offset, e.schema.Columns[offset].RetType) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (e *PointSelectExecutor) get(key kv.Key) (val []byte, err error) { | ||
| txn := e.ctx.Txn() | ||
| if txn != nil && txn.Valid() && !txn.IsReadOnly() { | ||
| return txn.Get(key) | ||
| } | ||
| return e.snapshot.Get(key) | ||
| } | ||
|
|
||
| func getColInfoByID(tbl *model.TableInfo, colID int64) *model.ColumnInfo { | ||
| for _, col := range tbl.Columns { | ||
| if col.ID == colID { | ||
| return col | ||
| } | ||
| } | ||
| return nil | ||
| } | ||
|
|
||
| func (e *PointSelectExecutor) Schema() *expression.Schema { | ||
| return e.schema | ||
| } | ||
|
|
||
| func (e *PointSelectExecutor) retTypes() []*types.FieldType { | ||
| if e.tps == nil { | ||
| e.tps = make([]*types.FieldType, e.schema.Len()) | ||
| for i := range e.schema.Columns { | ||
| e.tps[i] = e.schema.Columns[i].RetType | ||
| } | ||
| } | ||
| return e.tps | ||
| } | ||
|
|
||
| func (e *PointSelectExecutor) newChunk() *chunk.Chunk { | ||
| return chunk.NewChunkWithCapacity(e.retTypes(), 1) | ||
| } |
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