mahesh kumar behera created HIVE-25431:
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Summary: Enable CBO for null safe equality operator.
Key: HIVE-25431
URL: https://issues.apache.org/jira/browse/HIVE-25431
Project: Hive
Issue Type: Bug
Components: Hive, HiveServer2
Reporter: mahesh kumar behera
Assignee: mahesh kumar behera
The CBO is disabled for null safe equality (<=>) operator. This is causing the
sub optimal join execution for some queries. As null safe equality is
supported by joins, the CBO can be enabled for it. There will be issues with
join reordering as Hive does not support join reordering for null safe equality
operator. But with CBO enabled the join plan will be better.
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