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