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create_index.go
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create_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"
"strings"
vitess "github.com/dolthub/vitess/go/vt/sqlparser"
"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
)
// nodeCreateIndex handles *tree.CreateIndex nodes.
func nodeCreateIndex(node *tree.CreateIndex) (*vitess.AlterTable, error) {
if node == nil {
return nil, nil
}
if node.Concurrently {
return nil, fmt.Errorf("concurrent indexes are not yet supported")
}
if node.Using != "" && strings.ToLower(node.Using) != "btree" {
return nil, fmt.Errorf("index tablespace is not yet supported")
}
if node.Predicate != nil {
return nil, fmt.Errorf("WHERE is not yet supported")
}
indexDef, err := nodeIndexTableDef(&tree.IndexTableDef{
Name: node.Name,
Columns: node.Columns,
IndexParams: node.IndexParams,
})
if err != nil {
return nil, err
}
tableName, err := nodeTableName(&node.Table)
if err != nil {
return nil, err
}
var indexType string
if node.Unique {
indexType = vitess.UniqueStr
}
return &vitess.AlterTable{
Table: tableName,
Statements: []*vitess.DDL{
{
Action: vitess.AlterStr,
Table: tableName,
IfNotExists: node.IfNotExists,
IndexSpec: &vitess.IndexSpec{
Action: vitess.CreateStr,
FromName: indexDef.Info.Name,
ToName: indexDef.Info.Name,
Type: indexType,
Columns: indexDef.Columns,
Options: indexDef.Options,
},
},
},
}, nil
}