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| author | Nick Pope <nick@nickpope.me.uk> | 2021-06-30 00:08:27 +0100 |
|---|---|---|
| committer | Mariusz Felisiak <felisiak.mariusz@gmail.com> | 2021-07-19 13:41:16 +0200 |
| commit | fee87345967b3d917b618533585076cbfa43451b (patch) | |
| tree | 202561eec2284ce1bd3ae4793d32ac346b068848 /docs/ref | |
| parent | 501a8db46595b2d5b99c1d3b1146a832f43cdf1c (diff) | |
Refs #10929 -- Deprecated forced empty result value for PostgreSQL aggregates.
This deprecates forcing a return value for ArrayAgg, JSONBAgg, and
StringAgg when there are no rows in the query. Now that we have a
``default`` argument for aggregates, we want to revert to returning the
default of ``None`` which most aggregate functions return and leave it
up to the user to decide what they want to be returned by default.
Diffstat (limited to 'docs/ref')
| -rw-r--r-- | docs/ref/contrib/postgres/aggregates.txt | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/docs/ref/contrib/postgres/aggregates.txt b/docs/ref/contrib/postgres/aggregates.txt index 61ec86fa44..6d85d5c478 100644 --- a/docs/ref/contrib/postgres/aggregates.txt +++ b/docs/ref/contrib/postgres/aggregates.txt @@ -52,6 +52,13 @@ General-purpose aggregation functions from django.db.models import F F('some_field').desc() + .. deprecated:: 4.0 + + If there are no rows and ``default`` is not provided, ``ArrayAgg`` + returns an empty list instead of ``None``. This behavior is deprecated + and will be removed in Django 5.0. If you need it, explicitly set + ``default`` to ``Value([])``. + ``BitAnd`` ---------- @@ -138,6 +145,13 @@ General-purpose aggregation functions Examples are the same as for :attr:`ArrayAgg.ordering`. + .. deprecated:: 4.0 + + If there are no rows and ``default`` is not provided, ``JSONBAgg`` + returns an empty list instead of ``None``. This behavior is deprecated + and will be removed in Django 5.0. If you need it, explicitly set + ``default`` to ``Value('[]')``. + ``StringAgg`` ------------- @@ -164,6 +178,13 @@ General-purpose aggregation functions Examples are the same as for :attr:`ArrayAgg.ordering`. + .. deprecated:: 4.0 + + If there are no rows and ``default`` is not provided, ``StringAgg`` + returns an empty string instead of ``None``. This behavior is + deprecated and will be removed in Django 5.0. If you need it, + explicitly set ``default`` to ``Value('')``. + Aggregate functions for statistics ================================== |