wehub-resource-sync
71 lines
3.1 KiB
Go
71 lines
3.1 KiB
Go
// Copyright 2024 Dolthub, 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 analyzer
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import (
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"github.com/dolthub/go-mysql-server/sql"
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"github.com/dolthub/go-mysql-server/sql/analyzer"
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"github.com/dolthub/go-mysql-server/sql/plan"
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"github.com/dolthub/go-mysql-server/sql/transform"
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pgnodes "github.com/dolthub/doltgresql/server/node"
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)
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// InsertContextRootFinalizer inserts a ContextRootFinalizer node right before the transaction commits, yet after all
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// other nodes have finished. This ensures that the ContextRootFinalizer does not overwrite any changes from its
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// children.
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func InsertContextRootFinalizer(ctx *sql.Context, a *analyzer.Analyzer, node sql.Node, scope *plan.Scope, selector analyzer.RuleSelector, qFlags *sql.QueryFlags) (sql.Node, transform.TreeIdentity, error) {
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if _, ok := node.(*pgnodes.ContextRootFinalizer); ok {
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return node, transform.SameTree, nil
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}
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// Analysis may occur separately on child nodes, so we have to ensure that only one finalizer exists in the tree
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newNode, _, err := transform.NodeWithOpaque(ctx, node, transformRemoveContextRootFinalizer)
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if err != nil {
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return nil, transform.NewTree, err
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}
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return pgnodes.NewContextRootFinalizer(newNode), transform.NewTree, nil
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}
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// transformRemoveContextRootFinalizer is the function used by the transform from within InsertContextRootFinalizer.
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func transformRemoveContextRootFinalizer(ctx *sql.Context, node sql.Node) (sql.Node, transform.TreeIdentity, error) {
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if finalizer, ok := node.(*pgnodes.ContextRootFinalizer); ok {
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return finalizer.Child(), transform.NewTree, nil
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} else if disjointedNode, ok := node.(plan.DisjointedChildrenNode); ok {
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var err error
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same := transform.SameTree
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disjointedChildGroups := disjointedNode.DisjointedChildren()
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newDisjointedChildGroups := make([][]sql.Node, len(disjointedChildGroups))
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for groupIdx, disjointedChildGroup := range disjointedChildGroups {
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newDisjointedChildGroups[groupIdx] = make([]sql.Node, len(disjointedChildGroup))
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for childIdx, disjointedChild := range disjointedChildGroup {
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var childIdentity transform.TreeIdentity
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newDisjointedChildGroups[groupIdx][childIdx], childIdentity, err = transform.NodeWithOpaque(ctx, disjointedChild, transformRemoveContextRootFinalizer)
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if err != nil {
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return nil, transform.NewTree, err
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}
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same = same && childIdentity
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}
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}
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if same == transform.NewTree {
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if newChild, err := disjointedNode.WithDisjointedChildren(newDisjointedChildGroups); err != nil {
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return nil, transform.NewTree, err
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} else {
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return newChild, transform.NewTree, nil
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}
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}
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}
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return node, transform.SameTree, nil
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}
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