wjones127 commented on PR #37292:
URL: https://github.com/apache/arrow/pull/37292#issuecomment-1687384784
Python example:
```python
>>> import pyarrow as pa
>>> arr = pa.array([[1, 2, 3], [4, 5, 6]])
>>> arr.type
ListType(list<item: int64>)
>>> arr.cast(pa.list_(pa.int64(), 3))
<pyarrow.lib.FixedSizeListArray object at 0x132793e80>
[
[
1,
2,
3
],
[
4,
5,
6
]
]
>>> arr.cast(pa.list_(pa.int64(), 3)).cast(pa.list_(pa.int64()))
<pyarrow.lib.ListArray object at 0x132793ee0>
[
[
1,
2,
3
],
[
4,
5,
6
]
]
>>> arr.cast(pa.list_(pa.int64(), 2))
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "pyarrow/array.pxi", line 967, in pyarrow.lib.Array.cast
return _pc().cast(self, target_type, safe=safe,
File "/Users/willjones/Documents/arrow/python/pyarrow/compute.py", line
403, in cast
return call_function("cast", [arr], options, memory_pool)
File "pyarrow/_compute.pyx", line 572, in pyarrow._compute.call_function
return func.call(args, options=options, memory_pool=memory_pool,
File "pyarrow/_compute.pyx", line 367, in pyarrow._compute.Function.call
result = GetResultValue(
File "pyarrow/error.pxi", line 144, in
pyarrow.lib.pyarrow_internal_check_status
return check_status(status)
File "pyarrow/error.pxi", line 100, in pyarrow.lib.check_status
raise ArrowInvalid(message)
pyarrow.lib.ArrowInvalid: ListType can only be casted to FixedSizeListType
if the lists are all the expected size.
/Users/willjones/Documents/arrow/cpp/src/arrow/compute/exec.cc:920
kernel_->exec(kernel_ctx_, input, &output)
/Users/willjones/Documents/arrow/cpp/src/arrow/compute/function.cc:276
executor->Execute(input, &listener)
```
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