129 lines
3.8 KiB
Go
129 lines
3.8 KiB
Go
// Copyright 2017 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 distsql
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import (
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"context"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/kv"
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"github.com/pingcap/tidb/metrics"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/statistics"
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"github.com/pingcap/tidb/types"
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)
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// XAPI error codes.
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const (
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codeInvalidResp = 1
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)
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// Select sends a DAG request, returns SelectResult.
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// In kvReq, KeyRanges is required, Concurrency/KeepOrder/Desc/IsolationLevel/Priority are optional.
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func Select(ctx context.Context, sctx sessionctx.Context, kvReq *kv.Request, fieldTypes []*types.FieldType, fb *statistics.QueryFeedback) (SelectResult, error) {
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// For testing purpose.
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if hook := ctx.Value("CheckSelectRequestHook"); hook != nil {
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hook.(func(*kv.Request))(kvReq)
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}
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if !sctx.GetSessionVars().EnableStreaming {
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kvReq.Streaming = false
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}
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resp := sctx.GetClient().Send(ctx, kvReq, sctx.GetSessionVars().KVVars)
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if resp == nil {
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err := errors.New("client returns nil response")
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return nil, errors.Trace(err)
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}
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if kvReq.Streaming {
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return &streamResult{
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resp: resp,
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rowLen: len(fieldTypes),
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fieldTypes: fieldTypes,
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ctx: sctx,
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feedback: fb,
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}, nil
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}
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label := metrics.LblGeneral
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if sctx.GetSessionVars().InRestrictedSQL {
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label = metrics.LblInternal
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}
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return &selectResult{
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label: "dag",
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resp: resp,
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results: make(chan resultWithErr, kvReq.Concurrency),
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closed: make(chan struct{}),
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rowLen: len(fieldTypes),
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fieldTypes: fieldTypes,
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ctx: sctx,
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feedback: fb,
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sqlType: label,
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}, nil
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}
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// SelectWithRuntimeStats sends a DAG request, returns SelectResult.
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// The difference from Select is that SelectWithRuntimeStats will set copPlanIDs into selectResult,
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// which can help selectResult to collect runtime stats.
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func SelectWithRuntimeStats(ctx context.Context, sctx sessionctx.Context, kvReq *kv.Request,
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fieldTypes []*types.FieldType, fb *statistics.QueryFeedback, copPlanIDs []string) (SelectResult, error) {
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sr, err := Select(ctx, sctx, kvReq, fieldTypes, fb)
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if err != nil {
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return sr, err
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}
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if selectResult, ok := sr.(*selectResult); ok {
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selectResult.copPlanIDs = copPlanIDs
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}
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return sr, err
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}
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// Analyze do a analyze request.
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func Analyze(ctx context.Context, client kv.Client, kvReq *kv.Request, vars *kv.Variables,
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isRestrict bool) (SelectResult, error) {
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resp := client.Send(ctx, kvReq, vars)
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if resp == nil {
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return nil, errors.New("client returns nil response")
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}
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label := metrics.LblGeneral
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if isRestrict {
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label = metrics.LblInternal
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}
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result := &selectResult{
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label: "analyze",
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resp: resp,
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results: make(chan resultWithErr, kvReq.Concurrency),
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closed: make(chan struct{}),
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feedback: statistics.NewQueryFeedback(0, nil, 0, false),
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sqlType: label,
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}
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return result, nil
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}
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// Checksum sends a checksum request.
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func Checksum(ctx context.Context, client kv.Client, kvReq *kv.Request, vars *kv.Variables) (SelectResult, error) {
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resp := client.Send(ctx, kvReq, vars)
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if resp == nil {
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return nil, errors.New("client returns nil response")
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}
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result := &selectResult{
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label: "checksum",
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resp: resp,
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results: make(chan resultWithErr, kvReq.Concurrency),
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closed: make(chan struct{}),
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feedback: statistics.NewQueryFeedback(0, nil, 0, false),
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sqlType: metrics.LblGeneral,
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}
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return result, nil
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}
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