dangotbanned opened a new issue, #48679:
URL: https://github.com/apache/arrow/issues/48679
### Describe the bug, including details regarding any error messages,
version, and platform.
## Repro
```py
from __future__ import annotations
def pivot_wider(on: str, index: str, values: str) -> pa.Table:
import pyarrow as pa
import pyarrow.compute as pc # noqa: F811
from pyarrow.acero import AggregateNodeOptions, Declaration,
TableSourceNodeOptions
data = {
"foo": ["A", "A", "B", "B", "C"],
"bar": ["k", "l", "m", "n", "o"],
"N1": [1, 2, 2, 4, 2],
"N2": [1, 2, 2, 4, 2],
}
table = pa.Table.from_pydict(data)
source = Declaration("table_source",
options=TableSourceNodeOptions(table))
key_names = table.column(on).unique().to_pylist()
options = pc.PivotWiderOptions(key_names,
unexpected_key_behavior="raise")
aggregates = [([on, values], "hash_pivot_wider", options, values)]
pivot = Declaration("aggregate", AggregateNodeOptions(aggregates,
[index]))
result = Declaration.from_sequence([source, pivot]).to_table()
return result.flatten()
```
### Component(s)
Python, C++
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