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executor: move tidb_reader code to its named files. (pingcap#7065)
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,198 @@ | ||
| // 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/distsql" | ||
| "github.com/pingcap/tidb/model" | ||
| "github.com/pingcap/tidb/plan" | ||
| "github.com/pingcap/tidb/statistics" | ||
| "github.com/pingcap/tidb/table" | ||
| "github.com/pingcap/tidb/util/chunk" | ||
| "github.com/pingcap/tidb/util/ranger" | ||
| tipb "github.com/pingcap/tipb/go-tipb" | ||
| "golang.org/x/net/context" | ||
| ) | ||
|
|
||
| // make sure `TableReaderExecutor` implements `Executor`. | ||
| var _ Executor = &TableReaderExecutor{} | ||
|
|
||
| // TableReaderExecutor sends DAG request and reads table data from kv layer. | ||
| type TableReaderExecutor struct { | ||
| baseExecutor | ||
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| table table.Table | ||
| tableID int64 | ||
| keepOrder bool | ||
| desc bool | ||
| ranges []*ranger.Range | ||
| dagPB *tipb.DAGRequest | ||
| // columns are only required by union scan. | ||
| columns []*model.ColumnInfo | ||
|
|
||
| // resultHandler handles the order of the result. Since (MAXInt64, MAXUint64] stores before [0, MaxInt64] physically | ||
| // for unsigned int. | ||
| resultHandler *tableResultHandler | ||
| streaming bool | ||
| feedback *statistics.QueryFeedback | ||
|
|
||
| // corColInFilter tells whether there's correlated column in filter. | ||
| corColInFilter bool | ||
| // corColInAccess tells whether there's correlated column in access conditions. | ||
| corColInAccess bool | ||
| plans []plan.PhysicalPlan | ||
| } | ||
|
|
||
| // Open initialzes necessary variables for using this executor. | ||
| func (e *TableReaderExecutor) Open(ctx context.Context) error { | ||
| span, ctx := startSpanFollowsContext(ctx, "executor.TableReader.Open") | ||
| defer span.Finish() | ||
|
|
||
| var err error | ||
| if e.corColInFilter { | ||
| e.dagPB.Executors, _, err = constructDistExec(e.ctx, e.plans) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
| if e.corColInAccess { | ||
| ts := e.plans[0].(*plan.PhysicalTableScan) | ||
| access := ts.AccessCondition | ||
| pkTP := ts.Table.GetPkColInfo().FieldType | ||
| e.ranges, err = ranger.BuildTableRange(access, e.ctx.GetSessionVars().StmtCtx, &pkTP) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| } | ||
|
|
||
| e.resultHandler = &tableResultHandler{} | ||
| firstPartRanges, secondPartRanges := splitRanges(e.ranges, e.keepOrder) | ||
| firstResult, err := e.buildResp(ctx, firstPartRanges) | ||
| if err != nil { | ||
| e.feedback.Invalidate() | ||
| return errors.Trace(err) | ||
| } | ||
| if len(secondPartRanges) == 0 { | ||
| e.resultHandler.open(nil, firstResult) | ||
| return nil | ||
| } | ||
| var secondResult distsql.SelectResult | ||
| secondResult, err = e.buildResp(ctx, secondPartRanges) | ||
| if err != nil { | ||
| e.feedback.Invalidate() | ||
| return errors.Trace(err) | ||
| } | ||
| e.resultHandler.open(firstResult, secondResult) | ||
| return nil | ||
| } | ||
|
|
||
| // Next fills data into the chunk passed by its caller. | ||
| // The task was actually done by tableReaderHandler. | ||
| func (e *TableReaderExecutor) Next(ctx context.Context, chk *chunk.Chunk) error { | ||
| err := e.resultHandler.nextChunk(ctx, chk) | ||
| if err != nil { | ||
| e.feedback.Invalidate() | ||
| } | ||
| return errors.Trace(err) | ||
| } | ||
|
|
||
| // Close implements the Executor Close interface. | ||
| func (e *TableReaderExecutor) Close() error { | ||
| e.ctx.StoreQueryFeedback(e.feedback) | ||
| err := e.resultHandler.Close() | ||
| return errors.Trace(err) | ||
| } | ||
|
|
||
| // buildResp first build request and send it to tikv using distsql.Select. It uses SelectResut returned by the callee | ||
| // to fetch all results. | ||
| func (e *TableReaderExecutor) buildResp(ctx context.Context, ranges []*ranger.Range) (distsql.SelectResult, error) { | ||
| var builder distsql.RequestBuilder | ||
| kvReq, err := builder.SetTableRanges(e.tableID, ranges, e.feedback). | ||
| SetDAGRequest(e.dagPB). | ||
| SetDesc(e.desc). | ||
| SetKeepOrder(e.keepOrder). | ||
| SetStreaming(e.streaming). | ||
| SetFromSessionVars(e.ctx.GetSessionVars()). | ||
| Build() | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| result, err := distsql.Select(ctx, e.ctx, kvReq, e.retTypes(), e.feedback) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| result.Fetch(ctx) | ||
| return result, nil | ||
| } | ||
|
|
||
| type tableResultHandler struct { | ||
| // If the pk is unsigned and we have KeepOrder=true. | ||
| // optionalResult handles the request whose range is in signed int range. | ||
| // result handles the request whose range is exceed signed int range. | ||
| // Otherwise, we just set optionalFinished true and the result handles the whole ranges. | ||
| optionalResult distsql.SelectResult | ||
| result distsql.SelectResult | ||
|
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| optionalFinished bool | ||
| } | ||
|
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| func (tr *tableResultHandler) open(optionalResult, result distsql.SelectResult) { | ||
| if optionalResult == nil { | ||
| tr.optionalFinished = true | ||
| tr.result = result | ||
| return | ||
| } | ||
| tr.optionalResult = optionalResult | ||
| tr.result = result | ||
| tr.optionalFinished = false | ||
| } | ||
|
|
||
| func (tr *tableResultHandler) nextChunk(ctx context.Context, chk *chunk.Chunk) error { | ||
| if !tr.optionalFinished { | ||
| err := tr.optionalResult.Next(ctx, chk) | ||
| if err != nil { | ||
| return errors.Trace(err) | ||
| } | ||
| if chk.NumRows() > 0 { | ||
| return nil | ||
| } | ||
| tr.optionalFinished = true | ||
| } | ||
| return tr.result.Next(ctx, chk) | ||
| } | ||
|
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||
| func (tr *tableResultHandler) nextRaw(ctx context.Context) (data []byte, err error) { | ||
| if !tr.optionalFinished { | ||
| data, err = tr.optionalResult.NextRaw(ctx) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| if data != nil { | ||
| return data, nil | ||
| } | ||
| tr.optionalFinished = true | ||
| } | ||
| data, err = tr.result.NextRaw(ctx) | ||
| if err != nil { | ||
| return nil, errors.Trace(err) | ||
| } | ||
| return data, nil | ||
| } | ||
|
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||
| func (tr *tableResultHandler) Close() error { | ||
| err := closeAll(tr.optionalResult, tr.result) | ||
| tr.optionalResult, tr.result = nil, nil | ||
| return errors.Trace(err) | ||
| } |