davlee1972 opened a new issue, #43312:
URL: https://github.com/apache/arrow/issues/43312
### Describe the enhancement requested
I'm trying to define a schema in a yaml config file using pyarrow aliases,
but in one use case I have a binary column for the schema.
I tried using "fixed_size_binary[8]" for an alias and it is missing..
Here's a working example for date32..
```
>>> b = pa.date32()
>>> str(b)
'date32[day]'
>>> pa.type_for_alias("date32[day]")
DataType(date32[day])
```
Here's is the non-working example for binary.
```
>>> a = pa.binary(8)
>>> str(a)
'fixed_size_binary[8]'
>>> pa.type_for_alias("fixed_size_binary[8]")
Traceback (most recent call last):
File "pyarrow\\types.pxi", line 5266, in pyarrow.lib.type_for_alias
KeyError: 'fixed_size_binary[8]'
During handling of the above exception, another exception occurred:
Traceback (most recent call last):
File "<stdin>", line 1, in <module>
File "pyarrow\\types.pxi", line 5268, in pyarrow.lib.type_for_alias
ValueError: No type alias for fixed_size_binary[8]
```
Variable length binary does work..
```
>>> c = pa.binary()
>>> str(c)
'binary'
>>> pa.type_for_alias("binary")
DataType(binary)
```
### Component(s)
Python
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