Julian Hyde created CALCITE-727:
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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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