wehub-resource-sync
81 lines
2.6 KiB
Go
81 lines
2.6 KiB
Go
// 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 (
|
|
"github.com/cockroachdb/errors"
|
|
|
|
vitess "github.com/dolthub/vitess/go/vt/sqlparser"
|
|
"github.com/sirupsen/logrus"
|
|
|
|
"github.com/dolthub/doltgresql/postgres/parser/sem/tree"
|
|
)
|
|
|
|
// nodeIndexElemList converts a tree.IndexElemList to a slice of vitess.IndexField.
|
|
func nodeIndexElemList(ctx *Context, node tree.IndexElemList) ([]*vitess.IndexField, error) {
|
|
vitessIndexColumns := make([]*vitess.IndexField, 0, len(node))
|
|
for _, inputColumn := range node {
|
|
if inputColumn.Collation != "" {
|
|
logrus.Warn("index attribute collation is not yet supported, ignoring")
|
|
}
|
|
if inputColumn.OpClass != nil {
|
|
logrus.Warn("index attribute operator class is not yet supported, ignoring")
|
|
}
|
|
if inputColumn.ExcludeOp != nil {
|
|
return nil, errors.Errorf("index attribute exclude operator is not yet supported")
|
|
}
|
|
|
|
switch inputColumn.Direction {
|
|
case tree.DefaultDirection:
|
|
// Defaults to ASC
|
|
case tree.Ascending:
|
|
// The only default supported in GMS for now
|
|
case tree.Descending:
|
|
logrus.Warn("descending indexes are not yet supported, ignoring sort order")
|
|
default:
|
|
return nil, errors.Errorf("unknown index sorting direction encountered")
|
|
}
|
|
|
|
switch inputColumn.NullsOrder {
|
|
case tree.DefaultNullsOrder:
|
|
// TODO: the default NULL order is reversed compared to MySQL, so the default is technically always wrong.
|
|
// To prevent choking on every index, we allow this to proceed (even with incorrect results) for now.
|
|
case tree.NullsFirst:
|
|
// The only form supported in GMS for now
|
|
case tree.NullsLast:
|
|
return nil, errors.Errorf("NULLS LAST for indexes is not yet supported")
|
|
default:
|
|
return nil, errors.Errorf("unknown NULL ordering for index")
|
|
}
|
|
|
|
var expr vitess.Expr
|
|
if inputColumn.Expr != nil {
|
|
var err error
|
|
expr, err = nodeExpr(ctx, inputColumn.Expr)
|
|
if err != nil {
|
|
return nil, err
|
|
}
|
|
}
|
|
|
|
vitessIndexColumns = append(vitessIndexColumns, &vitess.IndexField{
|
|
Column: vitess.NewColIdent(string(inputColumn.Column)),
|
|
Order: vitess.AscScr,
|
|
Expression: expr,
|
|
})
|
|
}
|
|
|
|
return vitessIndexColumns, nil
|
|
}
|