CameronBieganek opened a new issue, #38019:
URL: https://github.com/apache/arrow/issues/38019
### Describe the bug, including details regarding any error messages,
version, and platform.
Trying to create a scalar or array of type `pa.decimal128(4, 2)` fails:
```python
In [90]: pa.scalar(1.2, type=pa.decimal128(4, 2))
---------------------------------------------------------------------------
ArrowTypeError Traceback (most recent call last)
Cell In[90], line 1
----> 1 pa.scalar(1.2, type=pa.decimal128(4, 2))
File
~\projects\ML_App_Template\venv\Lib\site-packages\pyarrow\scalar.pxi:1122, in
pyarrow.lib.scalar()
File
~\projects\ML_App_Template\venv\Lib\site-packages\pyarrow\error.pxi:144, in
pyarrow.lib.pyarrow_internal_check_status()
File
~\projects\ML_App_Template\venv\Lib\site-packages\pyarrow\error.pxi:123, in
pyarrow.lib.check_status()
ArrowTypeError: int or Decimal object expected, got float
In [91]: pa.array([1.2, 3.4], type=pa.decimal128(4, 2))
---------------------------------------------------------------------------
ArrowTypeError Traceback (most recent call last)
Cell In[91], line 1
----> 1 pa.array([1.2, 3.4], type=pa.decimal128(4, 2))
File
~\projects\ML_App_Template\venv\Lib\site-packages\pyarrow\array.pxi:327, in
pyarrow.lib.array()
File ~\projects\ML_App_Template\venv\Lib\site-packages\pyarrow\array.pxi:39,
in pyarrow.lib._sequence_to_array()
File
~\projects\ML_App_Template\venv\Lib\site-packages\pyarrow\error.pxi:144, in
pyarrow.lib.pyarrow_internal_check_status()
File
~\projects\ML_App_Template\venv\Lib\site-packages\pyarrow\error.pxi:123, in
pyarrow.lib.check_status()
ArrowTypeError: int or Decimal object expected, got float
```
But creating a float array and then casting to `pa.decimal128` does work:
```python
In [92]: pa.scalar(1.2).cast(pa.decimal128(4, 2))
Out[92]: <pyarrow.Decimal128Scalar: Decimal('1.20')>
In [93]: pa.array([1.2, 3.4]).cast(pa.decimal128(4, 2))
Out[93]:
<pyarrow.lib.Decimal128Array object at 0x0000023334EAF1C0>
[
1.20,
3.40
]
```
Can the direct construction (without `cast`) be made to work? I couldn't
find any documentation on other ways to create a decimal, like
`Decimal('1.20')`. I've seen `Decimal('1.20')` used in a different github
issue, but I can't figure out which module `Decimal` is in (if it still exists).
```python
In [94]: pa.__version__
Out[94]: '13.0.0'
```
### Component(s)
Python
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