alpaylan opened a new issue, #2760:
URL: https://github.com/apache/datafusion-sqlparser-rs/issues/2760
Since 0.59.0, a `NULL` pattern after `REGEXP` or `RLIKE` is consumed as if
it were `NOT NULL`, and the next token becomes the pattern:
```
SELECT 'abc' REGEXP NULL
-> sql parser error: Expected: an expression, found: EOF
SELECT a RLIKE NULL FROM t
-> displays as: SELECT a RLIKE FROM AS t (pattern is the identifier
FROM, no FROM clause)
SELECT a NOT REGEXP NULL OR b FROM t
-> displays as: SELECT a NOT REGEXP OR AS b FROM t
```
In 0.58.0 these parsed as `Expr::RLike { pattern: Value(Null), .. }` and
round-tripped.
Tested on main e15e9abf (also 0.63.0; 0.58.0 is fine).
Found with a property-based fuzzer (round trip and statement-separation
checks); I used AI assistance for triage and verified every case above.
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