/
noms_fk_indexer.go
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/
noms_fk_indexer.go
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// Copyright 2022 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 writer
import (
"github.com/dolthub/go-mysql-server/sql"
"github.com/dolthub/dolt/go/libraries/doltcore/schema"
"github.com/dolthub/dolt/go/libraries/doltcore/sqle/sqlutil"
"github.com/dolthub/dolt/go/libraries/doltcore/table/typed/noms"
)
type nomsFkIndexer struct {
writer *nomsTableWriter
idxName string
idxSch schema.Schema
nrr *noms.ReadRange
}
var _ sql.Table = nomsFkIndexer{}
func (n nomsFkIndexer) Name() string {
return n.writer.tableName
}
func (n nomsFkIndexer) String() string {
return n.writer.tableName
}
func (n nomsFkIndexer) Schema() sql.Schema {
return n.writer.sqlSch
}
func (n nomsFkIndexer) Partitions(ctx *sql.Context) (sql.PartitionIter, error) {
return sql.PartitionsToPartitionIter(fkDummyPartition{}), nil
}
func (n nomsFkIndexer) PartitionRows(ctx *sql.Context, partition sql.Partition) (sql.RowIter, error) {
dRows, err := n.writer.tableEditor.GetIndexedRows(ctx, n.nrr.Start, n.idxName, n.idxSch)
if err != nil {
return nil, err
}
rows := make([]sql.Row, len(dRows))
for i, dRow := range dRows {
rows[i], err = sqlutil.DoltRowToSqlRow(dRow, n.writer.sch)
if err != nil {
return nil, err
}
}
return sql.RowsToRowIter(rows...), err
}
// fkDummyPartition is used to return a partition that will be ignored, as a foreign key indexer does not handle
// partitioning, however a partition must be used in order to retrieve rows.
type fkDummyPartition struct{}
var _ sql.Partition = fkDummyPartition{}
// Key implements the interface sql.Partition.
func (n fkDummyPartition) Key() []byte {
return nil
}