Wes McKinney created ARROW-16819:
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Summary: [C++] arrow::compute::CallFunction needs a batch length
for nullary functions
Key: ARROW-16819
URL: https://issues.apache.org/jira/browse/ARROW-16819
Project: Apache Arrow
Issue Type: Improvement
Components: C++
Reporter: Wes McKinney
Assignee: Wes McKinney
Fix For: 9.0.0
This is a design deficiency in {{CallFunction}}. If a function is nullary, the
execution machinery has no way to determine the output length from an empty
vector of datums. We should change {{CallFunction}} to have variants based on
{{ExecBatch}} and {{ExecSpan}} (from ARROW-16755)
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