waynexia commented on a change in pull request #8662:
URL: https://github.com/apache/arrow/pull/8662#discussion_r523426357
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File path: rust/datafusion/src/physical_plan/projection.rs
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@@ -114,14 +117,33 @@ impl ExecutionPlan for ProjectionExec {
}
async fn execute(&self, partition: usize) ->
Result<SendableRecordBatchStream> {
+ let input = if
self.input.as_any().downcast_ref::<EmptyExec>().is_some() {
Review comment:
I add this field in commit ef09e12.
This flag is set in logical plan phase, `from_join_to_plan()`. If ast has no
`FROM` clause then an `EmptyRelation` node will be added with `produce_one_row`
set to true. And then comes to exec phase, `EmptyExec` will produce a
placeholder row.
Maybe this is better? :smiley:
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