HIVE-26653: Wrong results when (map) joining multiple tables on parti… #6165
+175
−28
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…tion column
What changes were proposed in this pull request?
In INNER joins, when we only project the small table's joining key, we can run into a situation when the hashmap's value is empty. Then, if we serialize the empty value, we will get
NULLs. Instead we should just copy thekeyinto the vectorized batch.Why are the changes needed?
Explained in detail: https://issues.apache.org/jira/browse/HIVE-26653
Does this PR introduce any user-facing change?
No
How was this patch tested?
Added unit tests in
TestMapJoinOperator.java. The original issue is not reproducible anymore because of an unrelated patch, as explained in the Jira.