[jira] [Assigned] (HIVE-21955) SearchArgumentImpl generates wrong ExpressionTree in some cases which might result in loss of data

["Zihao Ye (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/HIVE-21955?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Zihao Ye reassigned HIVE-21955:
-------------------------------

    Assignee: Zihao Ye

> 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, ORC
>            Reporter: Zihao Ye
>            Assignee: Zihao Ye
>            Priority: Critical
>
> 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 node which are exactly the same object in the expression tree. If this happens, those non-leaf node will be visited more than once in `buildLeafList` function. As a result, a wrong ExpressionTree is generated.



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