Hello,
I'm trying to generate SQL for a trigger that requires a little rewrite
of a RelNode structure and I wanted to know if anyone could help me
figure out how to do a few things
* I need to swap left and right of a LogicalJoin. Doing that messes up
predicates and projections though. Is there a utility I could use or
how would I do that?
* I need to introduce an "alias" like "NEW" into a RelNode for which I
want to create a RexNode "NEW.key1" for. I want to add a WHERE
condition based on the NEW alias. Not sure how I would do that
though. On SqlNode level only maybe?
* Can I somehow determine what columns of a table are unique or part
of the primary key? I want to create a predicate like (NEW.key1,
NEW.key2) = (existing.key1, existing.key2)
Thanks in advance!
Regards,
Christian
