private MAggregationGroupByOperator getmAggregationGroupByOperator() {
final List<AggregationFunctionGroupByOperator> aggregationFunctionGroupByOperatorList =
new ArrayList<AggregationFunctionGroupByOperator>();
Operator filterOperator =
new MatchEntireSegmentOperator(_indexSegment.getSegmentMetadata().getTotalRawDocs());
final BReusableFilteredDocIdSetOperator docIdSetOperator =
new BReusableFilteredDocIdSetOperator(
filterOperator, _indexSegment.getSegmentMetadata().getTotalRawDocs(), 5000);
final Map<String, DataSource> dataSourceMap = getDataSourceMap();
final MProjectionOperator projectionOperator =
new MProjectionOperator(dataSourceMap, docIdSetOperator);
for (int i = 0; i < _numAggregations; ++i) {
final MAggregationFunctionGroupByWithDictionaryAndTrieTreeOperator
aggregationFunctionGroupByOperator =
new MAggregationFunctionGroupByWithDictionaryAndTrieTreeOperator(
_aggregationInfos.get(i),
_groupBy,
new UReplicatedProjectionOperator(projectionOperator),
true);
aggregationFunctionGroupByOperatorList.add(aggregationFunctionGroupByOperator);
}
return new MAggregationGroupByOperator(
_indexSegment,
_aggregationInfos,
_groupBy,
projectionOperator,
aggregationFunctionGroupByOperatorList);
}
