74 lines
2.2 KiB
Go
74 lines
2.2 KiB
Go
// Copyright 2018 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 planner
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import (
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"github.com/pingcap/errors"
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"github.com/pingcap/parser/ast"
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"github.com/pingcap/tidb/infoschema"
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"github.com/pingcap/tidb/planner/cascades"
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plannercore "github.com/pingcap/tidb/planner/core"
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"github.com/pingcap/tidb/privilege"
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"github.com/pingcap/tidb/sessionctx"
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)
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// Optimize does optimization and creates a Plan.
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// The node must be prepared first.
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func Optimize(ctx sessionctx.Context, node ast.Node, is infoschema.InfoSchema) (plannercore.Plan, error) {
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fp := plannercore.TryFastPlan(ctx, node)
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if fp != nil {
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return fp, nil
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}
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// build logical plan
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ctx.GetSessionVars().PlanID = 0
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ctx.GetSessionVars().PlanColumnID = 0
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builder := plannercore.NewPlanBuilder(ctx, is)
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p, err := builder.Build(node)
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if err != nil {
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return nil, err
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}
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// Check privilege. Maybe it's better to move this to the Preprocess, but
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// we need the table information to check privilege, which is collected
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// into the visitInfo in the logical plan builder.
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if pm := privilege.GetPrivilegeManager(ctx); pm != nil {
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if err := plannercore.CheckPrivilege(pm, builder.GetVisitInfo()); err != nil {
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return nil, err
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}
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}
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// Handle the execute statement.
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if execPlan, ok := p.(*plannercore.Execute); ok {
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err := execPlan.OptimizePreparedPlan(ctx, is)
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return p, errors.Trace(err)
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}
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// Handle the non-logical plan statement.
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logic, isLogicalPlan := p.(plannercore.LogicalPlan)
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if !isLogicalPlan {
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return p, nil
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}
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// Handle the logical plan statement, use cascades planner if enabled.
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if ctx.GetSessionVars().EnableCascadesPlanner {
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return cascades.FindBestPlan(ctx, logic)
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}
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return plannercore.DoOptimize(builder.GetOptFlag(), logic)
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}
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func init() {
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plannercore.OptimizeAstNode = Optimize
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}
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