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https://issues.apache.org/jira/browse/HIVE-20502?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16609209#comment-16609209
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Daniel Voros commented on HIVE-20502:
-------------------------------------
Thanks [~kgyrtkirk] for the review and for rerunning the tests!
> Fix NPE while running skewjoin_mapjoin10.q when column stats is used.
> ---------------------------------------------------------------------
>
> Key: HIVE-20502
> URL: https://issues.apache.org/jira/browse/HIVE-20502
> Project: Hive
> Issue Type: Bug
> Components: Statistics
> Reporter: Zoltan Haindrich
> Assignee: Daniel Voros
> Priority: Major
> Fix For: 4.0.0
>
> Attachments: HIVE-20502.1.patch, HIVE-20502.2.patch,
> HIVE-20502.2.patch, HIVE-20502.2.patch
>
>
> Enabling {{hive.stats.fetch.column.stats}} makes this test fail during:
> {code}
> EXPLAIN
> SELECT a.*, b.* FROM T1_n151 a RIGHT OUTER JOIN T2_n88 b ON a.key = b.key
> {code}
> Seems like joinKeys is null at [this
> point|https://github.com/apache/hive/blob/48f92c31dee3983f573f2e66baaa213a0196f1ba/ql/src/java/org/apache/hadoop/hive/ql/optimizer/stats/annotation/StatsRulesProcFactory.java#L2169]
> Exception:
> {code}
> 2018-09-04T23:47:02,398 DEBUG [fef236ce-e62e-4c20-b0c0-3b15d2b336f7 main]
> annotation.StatsRulesProcFactory: STATS-JOIN[15]: detects none/multiple PK
> parents.
> 2018-09-04T23:47:02,409 ERROR [fef236ce-e62e-4c20-b0c0-3b15d2b336f7 main]
> ql.Driver: FAILED: NullPointerException null
> java.lang.NullPointerException
> at
> org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.isJoinKey(StatsRulesProcFactory.java:2169)
> at
> org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.updateNumNulls(StatsRulesProcFactory.java:2210)
> at
> org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.updateColStats(StatsRulesProcFactory.java:2276)
> at
> org.apache.hadoop.hive.ql.optimizer.stats.annotation.StatsRulesProcFactory$JoinStatsRule.process(StatsRulesProcFactory.java:1785)
> at
> org.apache.hadoop.hive.ql.lib.DefaultRuleDispatcher.dispatch(DefaultRuleDispatcher.java:90)
> at
> org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatchAndReturn(DefaultGraphWalker.java:105)
> at
> org.apache.hadoop.hive.ql.lib.DefaultGraphWalker.dispatch(DefaultGraphWalker.java:89)
> at
> org.apache.hadoop.hive.ql.lib.LevelOrderWalker.walk(LevelOrderWalker.java:143)
> {code}
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