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-rw-r--r--django/db/backends/base/features.py4
-rw-r--r--django/db/backends/postgresql/features.py4
2 files changed, 8 insertions, 0 deletions
diff --git a/django/db/backends/base/features.py b/django/db/backends/base/features.py
index 7626595741..22c2990e77 100644
--- a/django/db/backends/base/features.py
+++ b/django/db/backends/base/features.py
@@ -229,6 +229,10 @@ class BaseDatabaseFeatures:
supports_select_difference = True
supports_slicing_ordering_in_compound = False
+ # Does the database support SQL 2003 FILTER (WHERE ...) in aggregate
+ # expressions?
+ supports_aggregate_filter_clause = False
+
# Does the backend support indexing a TextField?
supports_index_on_text_field = True
diff --git a/django/db/backends/postgresql/features.py b/django/db/backends/postgresql/features.py
index 647fb9dc7f..3c7a7af80f 100644
--- a/django/db/backends/postgresql/features.py
+++ b/django/db/backends/postgresql/features.py
@@ -51,6 +51,10 @@ class DatabaseFeatures(BaseDatabaseFeatures):
$$ LANGUAGE plpgsql;"""
@cached_property
+ def supports_aggregate_filter_clause(self):
+ return self.connection.pg_version >= 90400
+
+ @cached_property
def has_select_for_update_skip_locked(self):
return self.connection.pg_version >= 90500