Dandandan commented on a change in pull request #55:
URL: https://github.com/apache/arrow-datafusion/pull/55#discussion_r619791415
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File path: datafusion/src/physical_optimizer/coalesce_batches.rs
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@@ -58,7 +59,17 @@ impl PhysicalOptimizerRule for CoalesceBatches {
// See https://issues.apache.org/jira/browse/ARROW-11068
let wrap_in_coalesce = plan_any.downcast_ref::<FilterExec>().is_some()
|| plan_any.downcast_ref::<HashJoinExec>().is_some()
- || plan_any.downcast_ref::<RepartitionExec>().is_some();
+ || {
+ match plan_any.downcast_ref::<RepartitionExec>() {
+ Some(p) => match p.partitioning() {
+ // do not coalesce hash partitions since other plans
like partitioned hash
+ // join depends on it empty batches for outter joins
Review comment:
```suggestion
// join depends on it empty batches for outer joins
```
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