alpaylan opened a new issue, #2807:
URL: https://github.com/apache/datafusion-sqlparser-rs/issues/2807
`Subscript::Slice` with `upper_bound: None` and a stride prints the two
colons next to each other, and the tokenizer then reads `::` (cast):
```
SELECT ([1, 2, 3, 4, 5, 6, 7, 8, 9])[1: :4]
-> displays as: SELECT ([1, 2, 3, 4, 5, 6, 7, 8, 9])[1::4]
-> reparse: Expected: a data type name, found: 4 at Line: 1, Column: 41
SELECT ([1, 2, 3, 4, 5, 6, 7, 8, 9])[: :4]
-> displays as: SELECT ([1, 2, 3, 4, 5, 6, 7, 8, 9])[::4]
-> reparse: Expected: an expression, found: :: at Line: 1, Column: 38
SELECT ([1, 2, 3, 4, 5, 6, 7, 8, 9])[1:-:4]
-> round-trips (fine)
```
DuckDB documents `[1:-:4]` for this
(https://duckdb.org/docs/stable/sql/functions/list#slicing), but it also runs
`[1: :4]` (returns `[1, 5, 9]`), and the parser accepts it. Something like `[1:
:4]` in Display would round-trip.
Tested with DuckDbDialect on main ce12f1f6 (also 0.63.0 and 0.58.0).
Found with a property-based fuzzer (round trip check); I used AI assistance
for triage and verified every case above.
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