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https://issues.apache.org/jira/browse/HIVE-21955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16878943#comment-16878943
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Zihao Ye commented on HIVE-21955:
---------------------------------
The failed tests are mostly related to Java version issues rather than this
patch.
> SearchArgumentImpl generates wrong ExpressionTree in some cases which might
> result in loss of data
> ---------------------------------------------------------------------------------------------------
>
> Key: HIVE-21955
> URL: https://issues.apache.org/jira/browse/HIVE-21955
> Project: Hive
> Issue Type: Bug
> Components: Hive, storage-api
> Affects Versions: 1.2.1
> Reporter: Zihao Ye
> Assignee: Zihao Ye
> Priority: Critical
> Labels: pushdown
> Attachments: HIVE-21955.1.branch-1.patch, HIVE-21955.branch-1.patch
>
>
> ExpressionBuilder applies `pushDownNot`, `foldMaybe`, `flatten`,
> `convertToCNF`, `flatten` and `buildLeafList` in order to form a
> non-normalized expression into a CNF expression with the unique leaves.
> After an expression is converted to CNF, there might be *more than one
> non-leaf nodes which are exactly the same object* in the expression tree. If
> this happens, those non-leaf nodes will be visited more than once in
> `buildLeafList` function. As a result, a wrong ExpressionTree is generated.
> My version is 1.2.1, but it seems that the higher versions are also affected
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