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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/releases/4.2.txt | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/docs/releases/4.2.txt b/docs/releases/4.2.txt index 59f144a15c..4bc68bb8a4 100644 --- a/docs/releases/4.2.txt +++ b/docs/releases/4.2.txt @@ -409,6 +409,16 @@ fields modified in the custom ``save()`` methods should be added to the ``update_fields`` keyword argument before calling ``super()``. See :ref:`overriding-model-methods` for more details. +Dropped support for raw aggregations on MySQL +--------------------------------------------- + +MySQL 8+ allows functional dependencies on ``GROUP BY`` columns, so the +pre-Django 4.2 workaround of grouping by primary keys of the main table is +removed. As a consequence, using ``RawSQL()`` aggregations is no longer +supported on MySQL as there is no way to determine if such aggregations are +needed or valid in the ``GROUP BY`` clause. Use :ref:`aggregation-functions` +instead. + Miscellaneous ------------- |