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| author | Mariusz Felisiak <felisiak.mariusz@gmail.com> | 2024-01-13 14:33:20 -0500 |
|---|---|---|
| committer | Mariusz Felisiak <felisiak.mariusz@gmail.com> | 2024-01-15 05:56:38 +0100 |
| commit | f3d10546a850df4fe3796f972d5b7e16adf52f54 (patch) | |
| tree | 91bf01575742ce83d2dd38f10fa0f03451e8ef49 /django/db/models/sql/query.py | |
| parent | d074c7530b812a7b78c9a201c8a70f281ed3a36e (diff) | |
Refs #35102 -- Optimized replace_expressions()/relabelling aliases by adding early return.
This avoids costly hashing.
Thanks Anthony Shaw for the report.
Co-Authored-By: Simon Charette <charette.s@gmail.com>
Diffstat (limited to 'django/db/models/sql/query.py')
| -rw-r--r-- | django/db/models/sql/query.py | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py index a79d66eb21..ce4fafb1e2 100644 --- a/django/db/models/sql/query.py +++ b/django/db/models/sql/query.py @@ -972,6 +972,8 @@ class Query(BaseExpression): relabelling any references to them in select columns and the where clause. """ + if not change_map: + return self # If keys and values of change_map were to intersect, an alias might be # updated twice (e.g. T4 -> T5, T5 -> T6, so also T4 -> T6) depending # on their order in change_map. |