andygrove commented on issue #353:
URL: https://github.com/apache/arrow-ballista/issues/353#issuecomment-1279890759
This is where the `EmptyExec` comes from:
```
impl TableProvider for ListingTable {
async fn scan(
&self,
ctx: &SessionState,
projection: &Option<Vec<usize>>,
filters: &[Expr],
limit: Option<usize>,
) -> Result<Arc<dyn ExecutionPlan>> {
let (partitioned_file_lists, statistics) =
self.list_files_for_scan(ctx, filters, limit).await?;
// if no files need to be read, return an `EmptyExec`
if partitioned_file_lists.is_empty() {
let schema = self.schema();
let projected_schema = project_schema(&schema,
projection.as_ref())?;
return Ok(Arc::new(EmptyExec::new(false, projected_schema)));
}
```
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