hongbin ma created KYLIN-2636:
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Summary: optimize case when in group by
Key: KYLIN-2636
URL: https://issues.apache.org/jira/browse/KYLIN-2636
Project: Kylin
Issue Type: Improvement
Reporter: hongbin ma
Assignee: hongbin ma
Similar to KYLIN-2635, for clauses like:
{code}
group by case when 1 = 1 then x 1 = 2 then y else z
{code}
kylin only need to pick up x as grouping by column.
Again, like KYLIN-2635, we'll fix it in KYLIN rather than calcite first
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