jonathanc-n commented on code in PR #16443:
URL: https://github.com/apache/datafusion/pull/16443#discussion_r2181119355
##########
datafusion/physical-plan/src/joins/nested_loop_join.rs:
##########
@@ -828,13 +833,127 @@ impl<T: BatchTransformer> NestedLoopJoinStream<T> {
handle_state!(self.process_probe_batch())
}
NestedLoopJoinStreamState::ExhaustedProbeSide => {
- handle_state!(self.process_unmatched_build_batch())
+ handle_state!(self.prepare_unmatched_output_indices())
+ }
+ NestedLoopJoinStreamState::OutputUnmatchedBuildRows(_) => {
+ handle_state!(self.build_unmatched_output())
}
NestedLoopJoinStreamState::Completed => Poll::Ready(None),
};
}
}
+ fn get_next_join_result(&mut self) -> Result<Option<RecordBatch>> {
+ let (left_indices, right_indices, start) =
+ self.join_result_status.as_mut().ok_or_else(|| {
+ datafusion_common::_internal_datafusion_err!(
+ "should have join_result_status"
+ )
+ })?;
+
+ let left_batch = self
+ .left_data
+ .as_ref()
+ .ok_or_else(|| {
+ datafusion_common::_internal_datafusion_err!("should have
left_batch")
+ })?
+ .batch();
+
+ let right_batch = match &self.state {
+ NestedLoopJoinStreamState::ProcessProbeBatch(record_batch) =>
record_batch,
+ NestedLoopJoinStreamState::OutputUnmatchedBuildRows(record_batch)
=> {
+ record_batch
+ }
+ _ => {
+ return internal_err!(
+ "state should be ProcessProbeBatch or OutputUnmatchBatch"
+ )
+ }
+ };
+
+ let current_start = *start;
+
+ if left_indices.is_empty() && right_indices.is_empty() &&
current_start == 0 {
Review Comment:
Can we build and return an empty batch instead of calling
build_batch_from_indices?
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