[jira] [Updated] (ARROW-17973) [C++] Expression::ToString wrong for nullary function call

["Neal Richardson (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/ARROW-17973?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Neal Richardson updated ARROW-17973:
------------------------------------
    Labels: good-first-issue  (was: )

> [C++] Expression::ToString wrong for nullary function call 
> -----------------------------------------------------------
>
>                 Key: ARROW-17973
>                 URL: https://issues.apache.org/jira/browse/ARROW-17973
>             Project: Apache Arrow
>          Issue Type: Bug
>          Components: C++
>            Reporter: Neal Richardson
>            Priority: Major
>              Labels: good-first-issue
>
> Easy reproducer from R:
> {code}
> library(arrow)
> Expression$create("random")
> # Expression
> # rando)
> {code}
> If you give it an argument (invalid in the case of random(), but Expression doesn't know that), it's fine:
> {code}
> Expression$create("random", Expression$scalar(1))
> # Expression
> # random(1)
> {code}



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