Hi,
Can I somehow declare RelOptRule to apply only on top of any combination of
listed children without explicitly declaring all possible combinations?
Example, I want to apply MyJoinRule only on top of [Project, Filter and
TableScan] in any combination.
It should apply on
1) Join -> Project -> Filter -> TableScan
2) Join -> Project -> TableScan
3) Join -> Filter -> TableScan
but it should not apply on
Join ->
Join -> Project -> Filter -> TableScan
Join -> Project -> Filter -> TableScan
The only way I found so far is to create many rules to explicitly declare
all supported trees.
I was looking into some() and unordered() methods without success.
Is there any better ways?
--
Oleksiy
