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

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

Neal Richardson created ARROW-17973:
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             Summary: [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


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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