zero323 edited a comment on pull request #34392:
URL: https://github.com/apache/spark/pull/34392#issuecomment-951674675
Since #33083, the idea of `Sequence` or `Iterable` popped up again, an it
might be nice to use it, but sadly it is not that simple.
Among other things, this would type check
```python
from pyspark.sql import SparkSession
spark = SparkSession.builder.getOrCreate()
(spark.read
.csv("foo.csv")
.groupBy("foo")
.pivot("bar", "baz")
.sum())
````
and that's clearly not correct.
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