gianm commented on a change in pull request #8194: HllSketch Merge/Build
BufferAggregators: Speed up init with prebuilt sketch.
URL: https://github.com/apache/incubator-druid/pull/8194#discussion_r308890340
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File path:
extensions-core/datasketches/src/main/java/org/apache/druid/query/aggregation/datasketches/hll/HllSketchMergeBufferAggregator.java
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@@ -40,14 +40,17 @@
public class HllSketchMergeBufferAggregator implements BufferAggregator
{
- /** for locking per buffer position (power of 2 to make index computation
faster) */
+ /**
+ * for locking per buffer position (power of 2 to make index computation
faster)
+ */
private static final int NUM_STRIPES = 64;
private final ColumnValueSelector<HllSketch> selector;
private final int lgK;
private final TgtHllType tgtHllType;
private final int size;
private final Striped<ReadWriteLock> stripedLock =
Striped.readWriteLock(NUM_STRIPES);
+ private final byte[] emptySketch;
Review comment:
Renamed it.
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