/**
* Copyright (C) 2014-2016 LinkedIn Corp. (pinot-core@linkedin.com)
*
* 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 com.linkedin.pinot.core.operator.filter;
import com.linkedin.pinot.core.common.Block;
import com.linkedin.pinot.core.common.BlockDocIdValueSet;
import com.linkedin.pinot.core.common.BlockId;
import com.linkedin.pinot.core.common.BlockMetadata;
import com.linkedin.pinot.core.common.BlockValSet;
import com.linkedin.pinot.core.common.DataSource;
import com.linkedin.pinot.core.common.DataSourceMetadata;
import com.linkedin.pinot.core.common.Predicate;
import com.linkedin.pinot.core.operator.blocks.BaseFilterBlock;
import com.linkedin.pinot.core.operator.docidsets.FilterBlockDocIdSet;
import com.linkedin.pinot.core.operator.docidsets.ScanBasedMultiValueDocIdSet;
import com.linkedin.pinot.core.operator.docidsets.ScanBasedSingleValueDocIdSet;
import com.linkedin.pinot.core.operator.filter.predicate.PredicateEvaluator;
import com.linkedin.pinot.core.operator.filter.predicate.PredicateEvaluatorProvider;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
public class ScanBasedFilterOperator extends BaseFilterOperator {
private static final Logger LOGGER = LoggerFactory.getLogger(ScanBasedFilterOperator.class);
private static final String OPERATOR_NAME = "ScanBasedFilterOperator";
private final PredicateEvaluator predicateEvaluator;
private DataSource dataSource;
private Integer startDocId;
private Integer endDocId;
private String name;
/**
* @param predicate
* @param dataSource
* @param startDocId inclusive
* @param endDocId inclusive
*/
public ScanBasedFilterOperator(Predicate predicate, DataSource dataSource, Integer startDocId, Integer endDocId) {
this.predicateEvaluator = PredicateEvaluatorProvider.getPredicateFunctionFor(predicate, dataSource);
this.dataSource = dataSource;
this.startDocId = startDocId;
this.endDocId = endDocId;
this.name = ScanBasedFilterOperator.class.getName() + "[" + dataSource.getOperatorName() + "]";
}
@Override
public boolean open() {
dataSource.open();
return true;
}
@Override
public BaseFilterBlock nextFilterBlock(BlockId BlockId) {
DataSourceMetadata dataSourceMetadata = dataSource.getDataSourceMetadata();
FilterBlockDocIdSet docIdSet;
Block nextBlock = dataSource.nextBlock();
BlockValSet blockValueSet = nextBlock.getBlockValueSet();
BlockMetadata blockMetadata = nextBlock.getMetadata();
if (dataSourceMetadata.isSingleValue()) {
docIdSet = new ScanBasedSingleValueDocIdSet(dataSource.getOperatorName(), blockValueSet, blockMetadata,
predicateEvaluator);
} else {
docIdSet = new ScanBasedMultiValueDocIdSet(dataSource.getOperatorName(), blockValueSet, blockMetadata,
predicateEvaluator);
}
if (startDocId != null) {
docIdSet.setStartDocId(startDocId);
}
if (endDocId != null) {
docIdSet.setEndDocId(endDocId);
}
return new ScanBlock(docIdSet);
}
@Override
public boolean isResultEmpty() {
return predicateEvaluator.alwaysFalse();
}
@Override
public boolean close() {
dataSource.close();
return true;
}
@Override
public String getOperatorName() {
return OPERATOR_NAME;
}
public static class ScanBlock extends BaseFilterBlock {
private FilterBlockDocIdSet docIdSet;
public ScanBlock(FilterBlockDocIdSet docIdSet) {
this.docIdSet = docIdSet;
}
@Override
public BlockId getId() {
return new BlockId(0);
}
@Override
public boolean applyPredicate(Predicate predicate) {
throw new UnsupportedOperationException("applypredicate not supported in " + this.getClass());
}
@Override
public BlockValSet getBlockValueSet() {
throw new UnsupportedOperationException("getBlockValueSet not supported in " + this.getClass());
}
@Override
public BlockDocIdValueSet getBlockDocIdValueSet() {
throw new UnsupportedOperationException("getBlockDocIdValueSet not supported in " + this.getClass());
}
@Override
public BlockMetadata getMetadata() {
throw new UnsupportedOperationException("getMetadata not supported in " + this.getClass());
}
@Override
public FilterBlockDocIdSet getFilteredBlockDocIdSet() {
return docIdSet;
}
}
@Override
public String toString() {
return ScanBasedFilterOperator.class.getName() + "-" + name;
}
}