viirya opened a new issue, #4911:
URL: https://github.com/apache/arrow-datafusion/issues/4911
**Describe the bug**
Executing `ProjectionExec` with no column will return an `Err`
`ArrowError(InvalidArgumentError("must either specify a row count or at least
one column"))`.
**To Reproduce**
It may not be hitting this error from SQL query directly. For some query
optimization might create projection with no column. I got this error when
converting optimized query from other query engine to DataFusion.
**Expected behavior**
A clear and concise description of what you expected to happen.
**Additional context**
Add any other context about the problem here.
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