diff options
Diffstat (limited to 'django/db/models/sql/compiler.py')
| -rw-r--r-- | django/db/models/sql/compiler.py | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py index 8d6b667828..318e6b8707 100644 --- a/django/db/models/sql/compiler.py +++ b/django/db/models/sql/compiler.py @@ -531,7 +531,6 @@ class SQLCompiler: compilers = [ query.get_compiler(self.using, self.connection, self.elide_empty) for query in self.query.combined_queries - if not query.is_empty() ] if not features.supports_slicing_ordering_in_compound: for compiler in compilers: @@ -546,6 +545,11 @@ class SQLCompiler: elif self.query.is_sliced and combinator == "union": limit = (self.query.low_mark, self.query.high_mark) for compiler in compilers: + # A sliced union cannot have its parts elided as some of them + # might be sliced as well and in the event where only a single + # part produces a non-empty resultset it might be impossible to + # generate valid SQL. + compiler.elide_empty = False if not compiler.query.is_sliced: compiler.query.set_limits(*limit) parts = () |