berkaysynnada commented on code in PR #13707:
URL: https://github.com/apache/datafusion/pull/13707#discussion_r1877504370
##########
datafusion/core/src/physical_optimizer/enforce_distribution.rs:
##########
@@ -836,7 +836,9 @@ fn add_roundrobin_on_top(
n_target: usize,
) -> Result<DistributionContext> {
// Adding repartition is helpful:
- if input.plan.output_partitioning().partition_count() < n_target {
+ if input.plan.output_partitioning().partition_count() < n_target
+ || input.plan.children().is_empty()
+ {
Review Comment:
```suggestion
if input.plan.output_partitioning().partition_count() < n_target
|| (input.plan.children().is_empty() &&
input.plan.output_partitioning().partition_count() > 1)
{
```
I think this check handles the intended case better.
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