[jira] [Created] (CALCITE-727) Constant folding involving CASE and NULL

["Julian Hyde (JIRA)" <ji...@apache.org>]

Julian Hyde created CALCITE-727:
-----------------------------------

             Summary: Constant folding involving CASE and NULL
                 Key: CALCITE-727
                 URL: https://issues.apache.org/jira/browse/CALCITE-727
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde
            Assignee: Julian Hyde


There are a few Hive issues relating to constant reduction of NULL and CASE. Calcite should do the same.

HIVE-9645:
{code}
select count(1) from store_sales where null=1;
# should simplify to
select count(1) from store_sales where false;
{code}

HIVE-9644:
{code}
select count(1) from store_sales where (case ss_sold_date when '1998-01-01' then 1 else null end)=1;
# should simplify to
select count(1) from store_sales where ss_sold_date= '1998-01-01' ;
{code}



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