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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