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Julian> It seems to me that Vladimir is trying to introduce a particular
kind of order because it seems “tidy”, not because anything is
fundamentally broken.
Collapsing EnumerableFilter(EnumerableFilter(...)) into LogicalFilter is
(fundamentally) broken:
1) It creates cycles in Volcano graph,
So many threads.
Vladimir asked whether I thought it was OK that a Logical RelNode should have
an input that is not logical. Yes, I do. LogicalFilter(JdbcTableScan) for
example (and, more generally, our use of toRel to create a table that is not
logical, but has a particular convention).
