Fix inconsistent field metadata in MERGE #2612
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Which Delta project/connector is this regarding?
Description
Fixes an issue where internal metadata attached to fields leaks into the plan constructed when executing a MERGE command, causing the same attribute to appear both with and without the internal metadata.
This can cause plan validation to fail due to the same attribute having two apparently different data types (metadata is part of a field datatype).
How was this patch tested?
Added test that would fail without the fix