Jefffrey commented on issue #7024:
URL: https://github.com/apache/arrow-rs/issues/7024#issuecomment-2614621145
**arrow-rs**
```rust
#[test]
fn test123() {
let values = StringArray::from(vec![Some("a"), Some("a"), Some("b"),
None]);
let res = rank(
&values,
Some(SortOptions {
descending: false,
nulls_first: false,
}),
)
.unwrap();
dbg!(res);
}
```
Output:
```bash
arrow-rs$ cargo test -p arrow-ord --lib rank::tests::test123 -- --nocapture
Finished `test` profile [unoptimized + debuginfo] target(s) in 0.05s
Running unittests src/lib.rs
(/media/jeffrey/1tb_860evo_ssd/.cargo_target_cache/debug/deps/arrow_ord-34ffc585b0d5be26)
running 1 test
[arrow-ord/src/rank.rs:373:9] res = [
2,
2,
3,
4,
]
test rank::tests::test123 ... ok
```
**Postgres**
```sql
postgres=# WITH vals (k) AS (VALUES ('a'), ('a'), ('b'), (null))
SELECT rank() over (order by k asc nulls last) FROM vals;
rank
------
1
1
3
4
(4 rows)
```
**DuckDB**
```sql
D select rank() over (order by col0 asc nulls last) from (values ('a'),
('a'), ('b'), (null));
┌────────────────────────────────────────────┐
│ rank() OVER (ORDER BY col0 ASC NULLS LAST) │
│ int64 │
├────────────────────────────────────────────┤
│ 1 │
│ 1 │
│ 3 │
│ 4 │
└────────────────────────────────────────────┘
```
# Options
- Accept this difference and maybe enhance docs to point out this difference
in behaviour
- Change to postgres/duckdb behaviour (subtle breaking change?)
- Make configurable (API breaking change?)
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