[jira] [Created] (ARROW-16290) [C++] ExecuteScalarExpression, when calling a nullary function on a nullary batch, resets the batch length to 1

["Weston Pace (Jira)" <ji...@apache.org>]

Weston Pace created ARROW-16290:
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             Summary: [C++] ExecuteScalarExpression, when calling a nullary function on a nullary batch, resets the batch length to 1
                 Key: ARROW-16290
                 URL: https://issues.apache.org/jira/browse/ARROW-16290
             Project: Apache Arrow
          Issue Type: Improvement
          Components: C++
            Reporter: Weston Pace


At the moment ARROW-16286 prevents us from using ExecuteScalarExpression on nullary functions.  However, if we bypass constant folding, then we run into another problem.  The batch passed to the function always has length = 1.

This appears to be tied up with the logic of ExecBatchIterator that I don't quite follow entirely.  However, we should be preserving the batch length of the input to ExecuteScalarExpression and passing that to the function.



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