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A module that is everything required to understands Druid Segments
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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 org.apache.druid.segment.index;
import org.apache.druid.collections.bitmap.BitmapFactory;
import org.apache.druid.collections.bitmap.ImmutableBitmap;
import org.apache.druid.query.BitmapResultFactory;
import org.apache.druid.segment.column.ColumnIndexCapabilities;
import org.apache.druid.segment.column.SimpleColumnIndexCapabilities;
import javax.annotation.Nullable;
public class AllFalseBitmapColumnIndex implements BitmapColumnIndex
{
private final BitmapFactory bitmapFactory;
@Nullable
private final ImmutableBitmap unknownBitmap;
public AllFalseBitmapColumnIndex(BitmapFactory bitmapFactory)
{
this(bitmapFactory, null);
}
public AllFalseBitmapColumnIndex(BitmapFactory bitmapFactory, @Nullable ImmutableBitmap unknownBitmap)
{
this.bitmapFactory = bitmapFactory;
this.unknownBitmap = unknownBitmap;
}
@Override
public ColumnIndexCapabilities getIndexCapabilities()
{
return SimpleColumnIndexCapabilities.getConstant();
}
@Override
public double estimateSelectivity(int totalRows)
{
return 0;
}
@Override
public T computeBitmapResult(BitmapResultFactory bitmapResultFactory, boolean includeUnknown)
{
if (includeUnknown && unknownBitmap != null) {
return bitmapResultFactory.wrapDimensionValue(unknownBitmap);
}
return bitmapResultFactory.wrapAllFalse(bitmapFactory.makeEmptyImmutableBitmap());
}
}