id	summary	reporter	owner	description	type	status	component	version	severity	resolution	keywords	cc	stage	has_patch	needs_docs	needs_tests	needs_better_patch	easy	ui_ux
37143	aiterator() missing check for chunk_size=None after prefetch_related()	Jacob Walls		"`aiterator()` is missing the [https://github.com/django/django/blob/4bbc27c8686f10f9556cef02dbfa9f5157fbcf56/django/db/models/query.py#L566 check] found in `iterator()` for `chunk_size=None` after `prefetch_related()`:

`iterator()` version:
{{{#!py
        if chunk_size is None:
            if self._prefetch_related_lookups:
                raise ValueError(
                    ""chunk_size must be provided when using QuerySet.iterator() after ""
                    ""prefetch_related().""
                )
}}}

I think this should have been implemented in #34331.

The rationale for the check was to alert users that the number of queries could spike with small batch sizes, which you might be tempted to minimize if prioritizing memory optimizations."	Bug	new	Database layer (models, ORM)	5.0	Normal				Unreviewed	0	0	0	0	0	0