Fixed #32940 -- Removed unnecessary branch and unused squash parameter in Node.add(). #14658
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ngnpope
suggested changes
Jul 18, 2021
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@charettes Would you be able to cast an eye over this, particularly because of the removal of the if self.connector == conn_type and data in self.children: line which was recently fixed by you to address a longstanding regression. Thanks! 🙂
Unused since its introduction in d3f00bd. Co-authored-by: Nick Pope <nick@nickpope.me.uk>
The "data in self.children" branch was causing data.__eq__ to be
called for each entries in "self.children" which resulted in a huge
slowdown during queryset construction.
It's purpose was to prevent queries of the form
Model.objects.filter(foo='bar').filter(foo='bar')
from resulting in
WHERE foo='bar' AND foo='bar'
but it's not covered by the suite and has arguable performance benefits
since it's not very common and SQL engines are usually very good at
folding/optimizing these.
See also #32632 for prior discussion around comparing data to the
Node's children.
Co-authored-by: Nick Pope <nick@nickpope.me.uk>
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Thanks y'all 🥇 I split commits. |
felixxm
changed the title
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Ticket 32940. Let's see if the whole test suite passes or if it will make a liar of me.