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Which issue does this PR close?

Closes #2870 .

Rationale for this change

What changes are included in this PR?

How are these changes tested?

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Investigating what would be broken for supporting PartialMerge

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so Spark creates intermittent columns which in scope only for partialmerge and then dropped, however it leads to

        internal_err!("UnboundColumn::evaluate() should not be called")

We probably need to mock those columns

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Unsupported aggregation mode PartialMerge

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