113 lines
3.6 KiB
Go
113 lines
3.6 KiB
Go
// Copyright 2021 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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// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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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 core
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import (
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"context"
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"time"
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"github.com/cznic/mathutil"
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"github.com/pingcap/errors"
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"github.com/pingcap/tidb/domain"
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"github.com/pingcap/tidb/parser/model"
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"github.com/pingcap/tidb/sessionctx"
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"github.com/pingcap/tidb/sessionctx/stmtctx"
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"github.com/pingcap/tidb/sessionctx/variable"
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)
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type collectPredicateColumnsPoint struct{}
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func (c collectPredicateColumnsPoint) optimize(ctx context.Context, plan LogicalPlan, op *logicalOptimizeOp) (LogicalPlan, error) {
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if plan.SCtx().GetSessionVars().InRestrictedSQL {
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return plan, nil
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}
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predicateNeeded := variable.EnableColumnTracking.Load()
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syncWait := plan.SCtx().GetSessionVars().StatsLoadSyncWait * time.Millisecond.Nanoseconds()
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histNeeded := syncWait > 0
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predicateColumns, histNeededColumns := CollectColumnStatsUsage(plan, predicateNeeded, histNeeded)
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if len(predicateColumns) > 0 {
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plan.SCtx().UpdateColStatsUsage(predicateColumns)
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}
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if histNeeded && len(histNeededColumns) > 0 {
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err := RequestLoadColumnStats(plan.SCtx(), histNeededColumns, syncWait)
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return plan, err
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}
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return plan, nil
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}
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func (c collectPredicateColumnsPoint) name() string {
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return "collect_predicate_columns_point"
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}
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type syncWaitStatsLoadPoint struct{}
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func (s syncWaitStatsLoadPoint) optimize(ctx context.Context, plan LogicalPlan, op *logicalOptimizeOp) (LogicalPlan, error) {
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if plan.SCtx().GetSessionVars().InRestrictedSQL {
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return plan, nil
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}
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_, err := SyncWaitStatsLoad(plan)
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return plan, err
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}
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func (s syncWaitStatsLoadPoint) name() string {
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return "sync_wait_stats_load_point"
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}
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const maxDuration = 1<<63 - 1
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// RequestLoadColumnStats send requests to stats handle
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func RequestLoadColumnStats(ctx sessionctx.Context, neededColumns []model.TableColumnID, syncWait int64) error {
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stmtCtx := ctx.GetSessionVars().StmtCtx
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hintMaxExecutionTime := int64(stmtCtx.MaxExecutionTime)
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if hintMaxExecutionTime <= 0 {
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hintMaxExecutionTime = maxDuration
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}
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sessMaxExecutionTime := int64(ctx.GetSessionVars().MaxExecutionTime)
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if sessMaxExecutionTime <= 0 {
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sessMaxExecutionTime = maxDuration
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}
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waitTime := mathutil.MinInt64(syncWait, mathutil.MinInt64(hintMaxExecutionTime, sessMaxExecutionTime))
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var timeout = time.Duration(waitTime)
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err := domain.GetDomain(ctx).StatsHandle().SendLoadRequests(stmtCtx, neededColumns, timeout)
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if err != nil {
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return handleTimeout(stmtCtx)
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}
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return nil
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}
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// SyncWaitStatsLoad sync-wait for stats load until timeout
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func SyncWaitStatsLoad(plan LogicalPlan) (bool, error) {
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stmtCtx := plan.SCtx().GetSessionVars().StmtCtx
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if stmtCtx.StatsLoad.Fallback {
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return false, nil
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}
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success := domain.GetDomain(plan.SCtx()).StatsHandle().SyncWaitStatsLoad(stmtCtx)
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if success {
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return true, nil
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}
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err := handleTimeout(stmtCtx)
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return false, err
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}
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func handleTimeout(stmtCtx *stmtctx.StatementContext) error {
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err := errors.New("Timeout when sync-load full stats for needed columns")
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if variable.StatsLoadPseudoTimeout.Load() {
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stmtCtx.AppendWarning(err)
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stmtCtx.StatsLoad.Fallback = true
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return nil
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}
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return err
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}
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