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drop_index.go
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drop_index.go
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// Copyright 2023 Dolthub, Inc.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
package ast
import (
"fmt"
vitess "github.com/dolthub/vitess/go/vt/sqlparser"
"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
)
// nodeDropIndex handles *tree.DropIndex nodes.
func nodeDropIndex(node *tree.DropIndex) (*vitess.AlterTable, error) {
if node == nil || len(node.IndexList) == 0 {
return nil, nil
}
switch node.DropBehavior {
case tree.DropDefault:
// Default behavior, nothing to do
case tree.DropRestrict:
return nil, fmt.Errorf("RESTRICT is not yet supported")
case tree.DropCascade:
return nil, fmt.Errorf("CASCADE is not yet supported")
}
if len(node.IndexList) > 1 {
return nil, fmt.Errorf("multi-index dropping is not yet supported")
}
if node.Concurrently {
return nil, fmt.Errorf("concurrent indexes are not yet supported")
}
var tableName vitess.TableName
ddls := make([]*vitess.DDL, len(node.IndexList))
for i, index := range node.IndexList {
newTableName, err := nodeTableName(&index.Table)
if err != nil {
return nil, err
}
if !tableName.Name.IsEmpty() && tableName.String() != newTableName.String() {
return nil, fmt.Errorf("only dropping indexes from the same table is currently supported")
}
tableName = newTableName
ddls[i] = &vitess.DDL{
Action: vitess.AlterStr,
Table: tableName,
IfExists: node.IfExists,
IndexSpec: &vitess.IndexSpec{
Action: vitess.DropStr,
FromName: vitess.NewColIdent(string(index.Index)),
ToName: vitess.NewColIdent(string(index.Index)),
},
}
}
return &vitess.AlterTable{
Table: tableName,
Statements: ddls,
}, nil
}