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Diffstat (limited to 'django/db/models/sql/compiler.py')
| -rw-r--r-- | django/db/models/sql/compiler.py | 4 |
1 files changed, 3 insertions, 1 deletions
diff --git a/django/db/models/sql/compiler.py b/django/db/models/sql/compiler.py index a7a8c98b99..b28dc925ba 100644 --- a/django/db/models/sql/compiler.py +++ b/django/db/models/sql/compiler.py @@ -331,7 +331,9 @@ class SQLCompiler: default_order, _ = ORDER_DIR["DESC"] selected_exprs = {} - if select := self.select: + # Avoid computing `selected_exprs` if there is no `ordering` as it's + # relatively expensive. + if ordering and (select := self.select): for ordinal, (expr, _, alias) in enumerate(select, start=1): pos_expr = PositionRef(ordinal, alias, expr) if alias: |