jorisvandenbossche commented on code in PR #12530:
URL: https://github.com/apache/arrow/pull/12530#discussion_r841760449
##########
python/pyarrow/tests/test_dataset.py:
##########
@@ -569,6 +570,22 @@ def test_partitioning():
with pytest.raises(pa.ArrowInvalid):
partitioning.parse(shouldfail)
+ partitioning = ds.FilenamePartitioning(
+ pa.schema([
+ pa.field('group', pa.int64()),
+ pa.field('key', pa.float64())
+ ])
+ )
+ assert partitioning.dictionaries is None
Review Comment:
@sanjibansg is there a specific reason you changed this to return an empty
list instead of None?
I am not necessarily saying that the original API to return None was better,
but it _is_ a change in behaviour that we should be a bit conscious about since
there might already be people relying on this (and so only do this if there is
a good reason for it).
You mentioned
> the dictionaries() method might have an issue where it returned None
object even if the Partitioning object has a dictionary field.
but I don't directly see any additional case in the tests related to this?
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