Github user tomatophantastico commented on the issue:
https://github.com/apache/metamodel/pull/148
Actually this should be slower than the previous solution as i removed the
join ordering and changed the way the filter/ join condition is evaluated.
Both made some assumptions i was not sure if they are right, so i try to go
a safer route instead.
On the other hand, this implementation plays nice with the existing
testcases. The existing testcases check for string equivalence of
DataSet.toString().
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