wiedld commented on code in PR #14637:
URL: https://github.com/apache/datafusion/pull/14637#discussion_r1957032310
##########
datafusion/physical-optimizer/src/enforce_sorting/mod.rs:
##########
@@ -138,27 +138,25 @@ fn is_coalesce_to_remove(
node: &Arc<dyn ExecutionPlan>,
parent: &Arc<dyn ExecutionPlan>,
) -> bool {
- node.as_any()
- .downcast_ref::<CoalescePartitionsExec>()
+ node.as_any().downcast_ref::<CoalescePartitionsExec>()
.map(|_coalesce| {
// TODO(wiedld): find a more generalized approach that does not
rely on
// pattern matching the structure of the DAG
// Note that the `Partitioning::satisfy()` (parent vs.
coalesce.child) cannot be used for cases of:
// * Repartition -> Coalesce -> Repartition
+ // * Coalesce -> AggregateExec(input=hash-partitioned)
- let parent_req_single_partition = matches!(
- parent.required_input_distribution()[0],
- Distribution::SinglePartition
- );
+ let parent_req_single_partition =
matches!(parent.required_input_distribution()[0], Distribution::SinglePartition)
+ // handle aggregates with input=hashPartitioning with a single
output partition
+ || (is_aggregate(parent) &&
parent.properties().output_partitioning().partition_count() <= 1);
Review Comment:
This single line is the fix for our found issue.
It's also isolated in it's [own
commit](https://github.com/apache/datafusion/pull/14637/commits/89556c2885a2277b6c969555ffdacecda2be38e1),
with the fixed test case.
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