Prasanth J created HIVE-5868:
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Summary: Add statistics rule for Union operator
Key: HIVE-5868
URL: https://issues.apache.org/jira/browse/HIVE-5868
Project: Hive
Issue Type: Sub-task
Affects Versions: 0.13.0
Reporter: Prasanth J
Assignee: Prasanth J
At this point union operator uses the default statistics rule which will merge
the statistics from its parent operators. The default rule does not assign the
output table alias to each of the column statistics. This will result in
incorrectly fetching column statistics when statistics of union operator is
referenced further down the operator tree. A new rule for union operator should
be added which should merge column statistics properly and rename the column
names based on output row schema of union operator.
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