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

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

Zihao Ye created HIVE-21955:
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             Summary: 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


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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