[jira] [Created] (ARROW-17826) [Python] Allow scalars when creating expression from compute kernels

["Joris Van den Bossche (Jira)" <ji...@apache.org>]

Joris Van den Bossche created ARROW-17826:
---------------------------------------------

             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. 



--
This message was sent by Atlassian Jira
(v8.20.10#820010)