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Add coments to DimExtractionTopNAlgorithm

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This commit is contained in:
Charles Allen 2015-07-01 09:54:31 -07:00
parent f2919b98b1
commit 5e19a615f1
1 changed files with 1 additions and 1 deletions
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processing/src/main/java/io/druid/query/topn/DimExtractionTopNAlgorithm.java
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@ -19,7 +19,6 @@ package io.druid.query.topn;
import com.google.common.collect.Maps;
import io.druid.query.aggregation.Aggregator;
import io.druid.query.extraction.ExtractionFn;
import io.druid.segment.Capabilities;
import io.druid.segment.Cursor;
import io.druid.segment.DimensionSelector;
@ -28,6 +27,7 @@ import io.druid.segment.data.IndexedInts;
import java.util.Map;
/**
* This has to be its own strategy because the pooled topn algorithm assumes each index is unique, and cannot handle multiple index numerals referencing the same dimension value.
*/
public class DimExtractionTopNAlgorithm extends BaseTopNAlgorithm<Aggregator[][], Map<String, Aggregator[]>, TopNParams>
{