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Posted to issues@spark.apache.org by "Hyukjin Kwon (JIRA)" <ji...@apache.org> on 2017/01/18 15:24:26 UTC
[jira] [Commented] (SPARK-18559) Fix HLL++ with small relative
error
[ https://issues.apache.org/jira/browse/SPARK-18559?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15828262#comment-15828262 ]
Hyukjin Kwon commented on SPARK-18559:
--------------------------------------
[~srowen], it seems mistakenly not resolved.
> Fix HLL++ with small relative error
> -----------------------------------
>
> Key: SPARK-18559
> URL: https://issues.apache.org/jira/browse/SPARK-18559
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Zhenhua Wang
>
> In HyperLogLogPlusPlus, if the relative error is so small that p >= 19, it will cause ArrayIndexOutOfBoundsException in THRESHOLDS(p-4) . We should check p and when p >= 19, regress to the original HLL result and use the small range correction they use.
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