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} -- This message was sent by Atlassian JIRA (v6.3.4#6332)