diff options
Diffstat (limited to 'django/db/models/sql/query.py')
| -rw-r--r-- | django/db/models/sql/query.py | 13 |
1 files changed, 10 insertions, 3 deletions
diff --git a/django/db/models/sql/query.py b/django/db/models/sql/query.py index 5a7dc25fd9..b7f8053cb1 100644 --- a/django/db/models/sql/query.py +++ b/django/db/models/sql/query.py @@ -525,7 +525,7 @@ class Query(BaseExpression): def has_filters(self): return self.where - def exists(self): + def exists(self, using, limit=True): q = self.clone() if not q.distinct: if q.group_by is True: @@ -534,14 +534,21 @@ class Query(BaseExpression): # SELECT clause which is about to be cleared. q.set_group_by(allow_aliases=False) q.clear_select_clause() + if q.combined_queries and q.combinator == 'union': + limit_combined = connections[using].features.supports_slicing_ordering_in_compound + q.combined_queries = tuple( + combined_query.exists(using, limit=limit_combined) + for combined_query in q.combined_queries + ) q.clear_ordering(True) - q.set_limits(high=1) + if limit: + q.set_limits(high=1) q.add_extra({'a': 1}, None, None, None, None, None) q.set_extra_mask(['a']) return q def has_results(self, using): - q = self.exists() + q = self.exists(using) compiler = q.get_compiler(using=using) return compiler.has_results() |