amansinha100 commented on a change in pull request #729: Drill 1328: Support
table statistics for Parquet
URL: https://github.com/apache/drill/pull/729#discussion_r256199914
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File path:
exec/java-exec/src/main/java/org/apache/drill/exec/physical/impl/statistics/NDVMergedStatistic.java
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@@ -123,7 +134,20 @@ public void setOutput(MapVector output) {
NullableBigIntVector vv = (NullableBigIntVector) outMapCol;
vv.allocateNewSafe();
if (colHLLHolder != null) {
- vv.getMutator().setSafe(0, 1, colHLLHolder.cardinality());
+ /* Hass and Stokes Duj1 estimator. See IBM Research Report RJ 10025
for more details.
Review comment:
I think this is spelled 'Haas'. Also, I believe this research report was
subsequently published in a conference or journal. Please see if you can find
the proper citation.
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