Gopal V created HIVE-9644:
-----------------------------
Summary: Constant folding case for CASE/WHEN
Key: HIVE-9644
URL: https://issues.apache.org/jira/browse/HIVE-9644
Project: Hive
Issue Type: Bug
Components: Logical Optimizer
Affects Versions: 1.2.0
Reporter: Gopal V
Constant folding for queries don't kick in for some automatically generated
query patterns which look like this.
{code}
hive> explain select count(1) from store_sales where (case ss_sold_date when
'1998-01-01' then 1 else null end)=1;
{code}
This should get rewritten by pushing the equality into the case branches.
{code}
select count(1) from store_sales where (case ss_sold_date when '1998-01-01'
then 1=1 else null=1 end);
{code}
Ending up with a simplified filter condition, resolving itself as
{code}
select count(1) from store_sales where ss_sold_date= '1998-01-01' ;
{code}
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