Harish Butani created OPTIQ-360:
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Summary: Introduce a Rule to infer predicates from equi join
conditions.
Key: OPTIQ-360
URL: https://issues.apache.org/jira/browse/OPTIQ-360
Project: Optiq
Issue Type: New Feature
Reporter: Harish Butani
Assignee: Julian Hyde
This is along the lines of the TransitivePredicate inference Rule in Hive.
For e.g. for
{code}
select 1 from sales.emp d inner join sales.emp e
on d.deptno = e.deptno where e.deptno > 7
{code}
we can infer
{code}
ProjectRel(EXPR$0=[1])
JoinRel(condition=[=($7, $16)], joinType=[inner])
FilterRel(condition=[>($7, 7)])
TableAccessRel(table=[[CATALOG, SALES, EMP]])
FilterRel(condition=[>($7, 7)])
TableAccessRel(table=[[CATALOG, SALES, EMP]])
{code}
More egs in the patch. We can do better than Hive: by pulling up Predicates
that are effective above every RelNode and inferring new Predicates for the
other side of a Join.
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