io.druid.segment.column.SimpleDictionaryEncodedColumn Maven / Gradle / Ivy
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* Licensed to Metamarkets Group Inc. (Metamarkets) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. Metamarkets 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 io.druid.segment.column;
import com.google.common.base.Predicate;
import com.google.common.base.Predicates;
import com.google.common.base.Strings;
import io.druid.java.util.common.guava.CloseQuietly;
import io.druid.query.extraction.ExtractionFn;
import io.druid.query.filter.ValueMatcher;
import io.druid.query.monomorphicprocessing.RuntimeShapeInspector;
import io.druid.segment.DimensionSelectorUtils;
import io.druid.segment.IdLookup;
import io.druid.segment.data.CachingIndexed;
import io.druid.segment.data.IndexedInts;
import io.druid.segment.data.IndexedMultivalue;
import io.druid.segment.data.ReadableOffset;
import io.druid.segment.data.SingleIndexedInt;
import io.druid.segment.filter.BooleanValueMatcher;
import io.druid.segment.historical.HistoricalDimensionSelector;
import io.druid.segment.historical.SingleValueHistoricalDimensionSelector;
import javax.annotation.Nullable;
import java.io.IOException;
import java.util.BitSet;
/**
*/
public class SimpleDictionaryEncodedColumn
implements DictionaryEncodedColumn
{
private final IndexedInts column;
private final IndexedMultivalue multiValueColumn;
private final CachingIndexed cachedLookups;
public SimpleDictionaryEncodedColumn(
IndexedInts singleValueColumn,
IndexedMultivalue multiValueColumn,
CachingIndexed cachedLookups
)
{
this.column = singleValueColumn;
this.multiValueColumn = multiValueColumn;
this.cachedLookups = cachedLookups;
}
@Override
public int length()
{
return hasMultipleValues() ? multiValueColumn.size() : column.size();
}
@Override
public boolean hasMultipleValues()
{
return column == null;
}
@Override
public int getSingleValueRow(int rowNum)
{
return column.get(rowNum);
}
@Override
public IndexedInts getMultiValueRow(int rowNum)
{
return multiValueColumn.get(rowNum);
}
@Override
public String lookupName(int id)
{
//Empty to Null will ensure that null and empty are equivalent for extraction function
return Strings.emptyToNull(cachedLookups.get(id));
}
@Override
public int lookupId(String name)
{
return cachedLookups.indexOf(name);
}
@Override
public int getCardinality()
{
return cachedLookups.size();
}
@Override
public HistoricalDimensionSelector makeDimensionSelector(final ReadableOffset offset, final ExtractionFn extractionFn)
{
abstract class QueryableDimensionSelector implements HistoricalDimensionSelector, IdLookup
{
@Override
public int getValueCardinality()
{
return getCardinality();
}
@Override
public String lookupName(int id)
{
final String value = SimpleDictionaryEncodedColumn.this.lookupName(id);
return extractionFn == null ?
value :
extractionFn.apply(value);
}
@Override
public boolean nameLookupPossibleInAdvance()
{
return true;
}
@Nullable
@Override
public IdLookup idLookup()
{
return extractionFn == null ? this : null;
}
@Override
public int lookupId(String name)
{
if (extractionFn != null) {
throw new UnsupportedOperationException(
"cannot perform lookup when applying an extraction function"
);
}
return SimpleDictionaryEncodedColumn.this.lookupId(name);
}
}
if (hasMultipleValues()) {
class MultiValueDimensionSelector extends QueryableDimensionSelector
{
@Override
public IndexedInts getRow()
{
return multiValueColumn.get(offset.getOffset());
}
@Override
public IndexedInts getRow(int offset)
{
return multiValueColumn.get(offset);
}
@Override
public ValueMatcher makeValueMatcher(String value)
{
return DimensionSelectorUtils.makeValueMatcherGeneric(this, value);
}
@Override
public ValueMatcher makeValueMatcher(Predicate predicate)
{
return DimensionSelectorUtils.makeValueMatcherGeneric(this, predicate);
}
@Override
public void inspectRuntimeShape(RuntimeShapeInspector inspector)
{
inspector.visit("multiValueColumn", multiValueColumn);
inspector.visit("offset", offset);
inspector.visit("extractionFn", extractionFn);
}
}
return new MultiValueDimensionSelector();
} else {
class SingleValueQueryableDimensionSelector extends QueryableDimensionSelector
implements SingleValueHistoricalDimensionSelector
{
@Override
public IndexedInts getRow()
{
return new SingleIndexedInt(getRowValue());
}
@Override
public int getRowValue()
{
return column.get(offset.getOffset());
}
@Override
public IndexedInts getRow(int offset)
{
return new SingleIndexedInt(getRowValue(offset));
}
@Override
public int getRowValue(int offset)
{
return column.get(offset);
}
@Override
public ValueMatcher makeValueMatcher(final String value)
{
if (extractionFn == null) {
final int valueId = lookupId(value);
if (valueId >= 0) {
return new ValueMatcher()
{
@Override
public boolean matches()
{
return getRowValue() == valueId;
}
@Override
public void inspectRuntimeShape(RuntimeShapeInspector inspector)
{
inspector.visit("column", SimpleDictionaryEncodedColumn.this);
}
};
} else {
return BooleanValueMatcher.of(false);
}
} else {
// Employ precomputed BitSet optimization
return makeValueMatcher(Predicates.equalTo(value));
}
}
@Override
public ValueMatcher makeValueMatcher(final Predicate predicate)
{
final BitSet predicateMatchingValueIds = DimensionSelectorUtils.makePredicateMatchingSet(
this,
predicate
);
return new ValueMatcher()
{
@Override
public boolean matches()
{
return predicateMatchingValueIds.get(getRowValue());
}
@Override
public void inspectRuntimeShape(RuntimeShapeInspector inspector)
{
inspector.visit("column", SimpleDictionaryEncodedColumn.this);
}
};
}
@Override
public void inspectRuntimeShape(RuntimeShapeInspector inspector)
{
inspector.visit("column", column);
inspector.visit("offset", offset);
inspector.visit("extractionFn", extractionFn);
}
}
return new SingleValueQueryableDimensionSelector();
}
}
@Override
public void close() throws IOException
{
CloseQuietly.close(cachedLookups);
if (column != null) {
column.close();
}
if (multiValueColumn != null) {
multiValueColumn.close();
}
}
}