tree 42b3077ea9db0f098ab0d03968bf6b2757594e54
parent 2912a0f9d9b32caf586b9383c7e027af3fe4c5c4
author Alex Behm <alex.behm@cloudera.com> 1503972099 -0700
committer Tim Armstrong <tarmstrong@cloudera.com> 1504130090 -0700

IMPALA-5850: Cast sender partition exprs under unions.

For a series of partitioned joins within the same fragment we must
cast the sender partition exprs of exchanges to compatible types.
Otherwise, the hashes generated for identical partition values may
differ among senders leading to wrong results.

The bug was that this casting process was only performed for
fragments that are hash-partitioned. However, a union produces a
fragment with RANDOM partition, but the union could still contain
partitioned joins whose senders need to be cast appropriately. The
fix is to add casts regardless of the fragment's data partition.

Testing:
- Core/hdfs run passed
- Added a new regresion test

Change-Id: I0aa801bcad8c2324d848349c7967d949224404e0
Reviewed-on: http://gerrit.cloudera.org:8080/7884
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: Impala Public Jenkins