io.trino.operator.index.IndexSnapshot Maven / Gradle / Ivy
/*
* 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 io.trino.operator.index;
import com.google.errorprone.annotations.Immutable;
import io.trino.operator.join.LookupSource;
import io.trino.spi.Page;
import io.trino.spi.PageBuilder;
import static java.util.Objects.requireNonNull;
@Immutable
public class IndexSnapshot
implements IndexedData
{
private static final Page EMPTY_PAGE = new Page(0);
private final LookupSource values;
private final LookupSource missingKeys;
public IndexSnapshot(LookupSource values, LookupSource missingKeys)
{
this.values = requireNonNull(values, "values is null");
this.missingKeys = requireNonNull(missingKeys, "missingKeys is null");
}
@Override
public long getJoinPosition(int position, Page page)
{
long joinPosition = values.getJoinPosition(position, page, page);
if (joinPosition < 0) {
if (missingKeys.getJoinPosition(position, page, page) < 0) {
return UNLOADED_INDEX_KEY;
}
return NO_MORE_POSITIONS;
}
return joinPosition;
}
@Override
public long getNextJoinPosition(long currentPosition)
{
return values.getNextJoinPosition(currentPosition, -1, EMPTY_PAGE);
}
@Override
public void appendTo(long position, PageBuilder pageBuilder, int outputChannelOffset)
{
values.appendTo(position, pageBuilder, outputChannelOffset);
}
@Override
public void close()
{
}
}