sundy-li opened a new issue, #676:
URL: https://github.com/apache/iceberg-rust/issues/676
For query `select count() from table`, the project is empty, so table should
not scan any columns and return an RecordBatch with empty arrays and the true
row count.
Yet it scans all columns.
```
/// Select all columns.
pub fn select_all(mut self) -> Self {
self.column_names.clear();
self
}
```
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