Michael Ho 3d7a4477ee IMPALA-2948: Fix a bug in the planner when fast partition key scan is enabled ...

When the query option OPTIMIZE_PARTITION_KEY_SCANS is true, we may
acquire the partition key values from the metadata and generate a
union node containing constant expressions only. There is a bug in
the planner when generating the union node as it skips evaluating
the constant expressions for unmaterialized slots but union node
expects an entry in the constant expression lists for each slot
in the tuple descriptor even if the slot is not materialized.

This change fixes the problem by inserting a dummy null values
in the constant expression list for unmaterialized slots and lets
the union node filter them out. A test is also added to verify
the fix.

Change-Id: I9ed49dca0101b96bd9b20e6d1e5b1d56f654e911
Reviewed-on: http://gerrit.cloudera.org:8080/2067
Reviewed-by: Alex Behm <alex.behm@cloudera.com>
Tested-by: Internal Jenkins

2016-02-06 05:28:28 +00:00

55 KiB

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