Joris Van den Bossche created ARROW-17826:
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Summary: [Python] Allow scalars when creating expression from
compute kernels
Key: ARROW-17826
URL: https://issues.apache.org/jira/browse/ARROW-17826
Project: Apache Arrow
Issue Type: Improvement
Components: Python
Reporter: Joris Van den Bossche
We can create an expression (eg for a projection) using the compute kernels and
passing expressions as arguments. But currently, all other arguments need to be
expressions:
{code:python}
>>> pc.add(pc.field("a"), pc.field("b")) # this works
<pyarrow.compute.Expression add(a, b)>
>>> pc.add(pc.field("a"), 1) # this fails when passing scalar (same for
>>> pa.scalar(1))
...
TypeError: only other expressions allowed as arguments
{code}
You can still pass a scalar expression ({{pc.scalar(1)}}, note {{pc.}} not
{{pa.}}), but I think for scalars it would be a nice usability improvement if
it's not needed to manually convert your python or pyarrow scalar to a scalar
expression.
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