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Code Issues 32 Releases Wiki Activity

Refs #32143 -- Adjusted a comment about subquery usage in Query.split_exclude().

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This commit is contained in:
Simon Charette
2023-05-31 00:03:46 -04:00
committed by Mariusz Felisiak
parent 0cfcab4eec
commit cfc9c94d97
1 changed files with 4 additions and 5 deletions
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9
django/db/models/sql/query.py
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@@ -2035,11 +2035,10 @@ class Query(BaseExpression):
)
condition.add(or_null_condition, OR)
# Note that the end result will be:
# (outercol NOT IN innerq AND outercol IS NOT NULL) OR outercol IS NULL.
# This might look crazy but due to how IN works, this seems to be
# correct. If the IS NOT NULL check is removed then outercol NOT
# IN will return UNKNOWN. If the IS NULL check is removed, then if
# outercol IS NULL we will not match the row.
# NOT EXISTS (inner_q) OR outercol IS NULL
# this might look crazy but due to how NULL works, this seems to be
# correct. If the IS NULL check is removed, then if outercol
# IS NULL we will not match the row.
return condition, needed_inner
def set_empty(self):