pitrou commented on issue #40128:
URL: https://github.com/apache/arrow/issues/40128#issuecomment-1954197598
We do:
```python
>>> a = pa.array([1,2,3,1]).dictionary_encode()
>>> pc.coalesce(a[:1])
<pyarrow.lib.DictionaryArray object at 0x7f0ef4948ba0>
-- dictionary:
[
1,
2,
3
]
-- indices:
[
0
]
>>> pc.coalesce(a[:0])
<pyarrow.lib.DictionaryArray object at 0x7f0ef49d70d0>
-- dictionary:
[]
-- indices:
[]
```
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