timsaucer opened a new pull request, #1187:
URL: https://github.com/apache/datafusion-python/pull/1187
# Which issue does this PR close?
None
# Rationale for this change
This is a relatively minor change that allows users to pass a single
expression for `order_by` and `partition_by` fields.
Without this change, if used improperly planning gets stuck in a loop. This
improves ergonomics.
Old version required:
```python
df.select(f.lag(column("a"), order_by=[column("b")])
```
and now you can also write
```python
df.select(f.lag(column("a"), order_by=column("b"))
```
# What changes are included in this PR?
Enhances the check to see if we pass a single expression. When this is true,
wrap it in a list. Added unit tests.
# Are there any user-facing changes?
This is a non-breaking signature change. It is backwards compatible.
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