forked from rDrama/rDrama
Snakes
9eab252e5b
Consider the case of the current /notifications filter condition: WHERE ... NOT ((comments.sentto = 2) AND (users.is_muted)) SELECT 1 WHERE NOT ((null = 2) AND (true)); ⇒ 0 rows SELECT 1 WHERE NOT ((1 = 2) AND (true)); ⇒ 1 row SELECT 1 WHERE NOT ((2 = 2) AND (true)); ⇒ 0 rows We want the first expression, where comments.sentto = null, to evaluate to false, not to null, so it negates to true. Behavior as written is: SELECT 1 WHERE NOT ((null = 2) AND (true)); → SELECT 1 WHERE NOT (null AND true); → SELECT 1 WHERE NOT null; → SELECT 1 WHERE null; Which guarantees a null return set. If we check first for non-nullity: SELECT 1 WHERE NOT ((null IS NOT null) AND (null = 2) AND (true)); ⇒ 1 SELECT 1 WHERE NOT ((1 IS NOT null) AND (1 = 2) AND (true)); ⇒ 1 SELECT 1 WHERE NOT ((2 IS NOT null) AND (2 = 2) AND (true)); ⇒ 0 |
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__init__.py | ||
__main__.py | ||
cli.py |