Keuntae Park created TAJO-1275:
----------------------------------
Summary: Optimizer push down non-equi filter as theta join
qualifier
Key: TAJO-1275
URL: https://issues.apache.org/jira/browse/TAJO-1275
Project: Tajo
Issue Type: Bug
Reporter: Keuntae Park
Assignee: Keuntae Park
Priority: Minor
Plan rewriter pushes down filters to leaf node as possible and changes filter
condition to join qualifier if possible.
Even though Tajo does not support theta-join completely, however,
it pushes down non-equi compare and makes it as join qualifier sometimes.
For example,
{code}
select * from (select a.r_name as a_name, b.c_name as c_name from region a,
customer b) xx where a_name < c_name
{code}
is rewritten as
{code}
select a.r_name as a_name, b.c_name as c_name from region a join customer b on
a_name < c_name
{code}
And
{code}
select * from region a join customer b on a.r_regionkey = b.c_custkey where
a.r_name < c.c_name
{code}
is rewritten as
{code}
select * from region a join customer b on a.r_regionkey = b.c_custkey and
a.r_name < c.c_name
{code}
Until TAJO-742 is resolved (that means theta join is supported),
I think it should not be allowed to rewrite non-equi filter condition to join
qualifier.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
