Provide field and schema metadata missing on distinct aggregations. #12691
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Which issue does this PR close?
Closes #12687
Rationale for this change
A PR merged (and released in 42.0.0) has added a check that the logical and physical plan input schemas (to an aggregate node) are the same.
Once released into the wild, it began being triggered. One example case is issue #12687 where field metadata is in the logical plan, but missing from the physical plan.
What changes are included in this PR?
commit 1 = made regression tests, which are failing.
commit 2 = fixed those tests.
Are these changes tested?
Yes
Are there any user-facing changes?
No