59 lines
1.6 KiB
Go
59 lines
1.6 KiB
Go
// Copyright 2024 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 task
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import (
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"github.com/pingcap/tidb/pkg/planner/cascades/base"
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"github.com/pingcap/tidb/pkg/planner/cascades/base/cascadesctx"
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"github.com/pingcap/tidb/pkg/planner/cascades/memo"
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"github.com/pingcap/tidb/pkg/planner/cascades/util"
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)
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var _ base.Task = &OptGroupTask{}
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// OptGroupTask is a wrapper of running logic of exploring a group.
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type OptGroupTask struct {
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BaseTask
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group *memo.Group
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}
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// NewOptGroupTask returns a new optimizing group task.
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func NewOptGroupTask(ctx cascadesctx.Context, g *memo.Group) base.Task {
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return &OptGroupTask{BaseTask: BaseTask{
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ctx: ctx,
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}, group: g}
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}
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// Execute implements the task.Execute interface.
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func (g *OptGroupTask) Execute() error {
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if g.group.IsExplored() {
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return nil
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}
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g.group.ForEachGE(func(ge *memo.GroupExpression) bool {
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g.Push(NewOptGroupExpressionTask(g.ctx, ge))
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return true
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})
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g.group.SetExplored()
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return nil
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}
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// Desc implements the task.Desc interface.
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func (g *OptGroupTask) Desc(w util.StrBufferWriter) {
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w.WriteString("OptGroupTask{group:")
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g.group.String(w)
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w.WriteString("}")
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}
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