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From "Zihao Ye (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HIVE-21955) SearchArgumentImpl generates wrong ExpressionTree in some cases which might result in loss of data
Date Thu, 04 Jul 2019 08:14:00 GMT

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

Zihao Ye updated HIVE-21955:
----------------------------
          Attachment: HIVE-21955.branch-1.patch
    Target Version/s: 1.2.1
              Status: Patch Available  (was: Open)

> 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.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 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.
> My version is 1.2.1, but it seems that the higher versions are also affected



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