test(join): add test that colliding column names will get merged into one #10778
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Yep, this isn't entirely correct. The name is only allowed to be merged into a single output column in the case of inner joins (with equality predicates only, which is implicit in this test). |
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I'm adding this PR mostly as a demo of what I think might be undesirable behavior. Should this instead error, because the two input columns are getting mapped to the same output column?
@cpcloud curious what you think here