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negative_index.go
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negative_index.go
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// Copyright 2020-2021 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 memory
import (
"github.com/Sndav/go-mysql-server/sql"
"github.com/Sndav/go-mysql-server/sql/expression"
)
type NegateIndexLookup struct {
Lookup MergeableLookup
Index ExpressionsIndex
}
var _ memoryIndexLookup = (*NegateIndexLookup)(nil)
var _ sql.IndexLookup = (*NegateIndexLookup)(nil)
func (l *NegateIndexLookup) ID() string { return "not " + l.Lookup.ID() }
func (l *NegateIndexLookup) String() string { return "not " + l.Lookup.ID() }
func (l *NegateIndexLookup) Values(p sql.Partition) (sql.IndexValueIter, error) {
return &indexValIter{
tbl: l.Index.MemTable(),
partition: p,
matchExpression: l.EvalExpression(),
}, nil
}
func (l *NegateIndexLookup) EvalExpression() sql.Expression {
return expression.NewNot(l.Lookup.(memoryIndexLookup).EvalExpression())
}
func (l *NegateIndexLookup) Indexes() []string {
return []string{l.ID()}
}
func (*NegateIndexLookup) IsMergeable(lookup sql.IndexLookup) bool {
_, ok := lookup.(MergeableLookup)
return ok
}
func (l *NegateIndexLookup) Union(lookups ...sql.IndexLookup) (sql.IndexLookup, error) {
return union(l.Index, l, lookups...), nil
}
func (l *NegateIndexLookup) Intersection(indexes ...sql.IndexLookup) (sql.IndexLookup, error) {
return intersection(l.Index, l, indexes...), nil
}