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Changes between Initial Version and Version 1 of Ticket #30771, comment 3

initial	v1
6	6
7	7	We probably don't want to perform the `clear_select_clause` and `add_fields(['pk'])` when the query is already only selecting a single field.
	8
	9	That's exactly what `In.process_rhs` [https://github.com/django/django/blob/ea25bdc2b94466bb1563000bf81628dea4d80612/django/db/models/lookups.py#L356-L358 does already] by only performing these operations `if not getattr(self.rhs, 'has_select_fields', True)`.