wehub-resource-sync
71 lines
2.2 KiB
Go
71 lines
2.2 KiB
Go
// Copyright 2023 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 ast
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import (
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"github.com/cockroachdb/errors"
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vitess "github.com/dolthub/vitess/go/vt/sqlparser"
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"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
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)
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// nodeDropIndex handles *tree.DropIndex nodes.
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func nodeDropIndex(ctx *Context, node *tree.DropIndex) (*vitess.AlterTable, error) {
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if node == nil || len(node.IndexList) == 0 {
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return nil, nil
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}
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switch node.DropBehavior {
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case tree.DropDefault:
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// Default behavior, nothing to do
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case tree.DropRestrict:
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return nil, errors.Errorf("RESTRICT is not yet supported")
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case tree.DropCascade:
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return nil, errors.Errorf("CASCADE is not yet supported")
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}
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if len(node.IndexList) > 1 {
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return nil, errors.Errorf("multi-index dropping is not yet supported")
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}
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if node.Concurrently {
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return nil, errors.Errorf("concurrent indexes are not yet supported")
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}
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var tableName vitess.TableName
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ddls := make([]*vitess.DDL, len(node.IndexList))
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for i, index := range node.IndexList {
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newTableName, err := nodeTableName(ctx, &index.Table)
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if err != nil {
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return nil, err
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}
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if !tableName.Name.IsEmpty() && tableName.String() != newTableName.String() {
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return nil, errors.Errorf("only dropping indexes from the same table is currently supported")
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}
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tableName = newTableName
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ddls[i] = &vitess.DDL{
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Action: vitess.AlterStr,
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Table: tableName,
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IfExists: node.IfExists,
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IndexSpec: &vitess.IndexSpec{
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Action: vitess.DropStr,
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FromName: vitess.NewColIdent(string(index.Index)),
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ToName: vitess.NewColIdent(string(index.Index)),
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},
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}
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}
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return &vitess.AlterTable{
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Table: tableName,
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Statements: ddls,
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}, nil
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}
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