122 lines
3.0 KiB
Go
122 lines
3.0 KiB
Go
// Copyright 2020 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 executor
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import (
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"context"
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"fmt"
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"github.com/opentracing/opentracing-go"
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"github.com/pingcap/tidb/table"
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"github.com/pingcap/tidb/util/chunk"
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)
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// PartitionTableExecutor is a Executor for partitioned table.
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// It works by wrap the underlying TableReader/IndexReader/IndexLookUpReader.
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type PartitionTableExecutor struct {
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baseExecutor
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nextPartition
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partitions []table.PhysicalTable
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cursor int
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curr Executor
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}
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type nextPartition interface {
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nextPartition(context.Context, table.PhysicalTable) (Executor, error)
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}
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type nextPartitionForTableReader struct {
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exec *TableReaderExecutor
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}
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func (n nextPartitionForTableReader) nextPartition(ctx context.Context, tbl table.PhysicalTable) (Executor, error) {
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n.exec.table = tbl
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return n.exec, nil
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}
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type nextPartitionForIndexLookUp struct {
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exec *IndexLookUpExecutor
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}
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func (n nextPartitionForIndexLookUp) nextPartition(ctx context.Context, tbl table.PhysicalTable) (Executor, error) {
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n.exec.table = tbl
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return n.exec, nil
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}
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type nextPartitionForIndexReader struct {
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exec *IndexReaderExecutor
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}
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func (n nextPartitionForIndexReader) nextPartition(ctx context.Context, tbl table.PhysicalTable) (Executor, error) {
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exec := n.exec
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exec.table = tbl
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exec.physicalTableID = tbl.GetPhysicalID()
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return exec, nil
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}
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func nextPartitionWithTrace(ctx context.Context, n nextPartition, tbl table.PhysicalTable) (Executor, error) {
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if span := opentracing.SpanFromContext(ctx); span != nil && span.Tracer() != nil {
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span1 := span.Tracer().StartSpan(fmt.Sprintf("nextPartition %d", tbl.GetPhysicalID()), opentracing.ChildOf(span.Context()))
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defer span1.Finish()
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ctx = opentracing.ContextWithSpan(ctx, span1)
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}
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return n.nextPartition(ctx, tbl)
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}
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// Next implements the Executor interface.
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func (e *PartitionTableExecutor) Next(ctx context.Context, chk *chunk.Chunk) error {
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chk.Reset()
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var err error
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for e.cursor < len(e.partitions) {
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if e.curr == nil {
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n := e.nextPartition
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e.curr, err = nextPartitionWithTrace(ctx, n, e.partitions[e.cursor])
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if err != nil {
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return err
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}
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if err := e.curr.Open(ctx); err != nil {
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return err
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}
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}
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err = Next(ctx, e.curr, chk)
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if err != nil {
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return err
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}
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if chk.NumRows() > 0 {
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break
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}
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err = e.curr.Close()
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if err != nil {
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return err
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}
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e.curr = nil
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e.cursor++
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}
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return nil
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}
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// Close implements the Executor interface.
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func (e *PartitionTableExecutor) Close() error {
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var err error
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if e.curr != nil {
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err = e.curr.Close()
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e.curr = nil
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}
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return err
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}
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