cloud-fan commented on PR #42099:
URL: https://github.com/apache/spark/pull/42099#issuecomment-1649026633
I think the problem is
```
if (partitions.length == 1) {
SinglePartition
}
```
For `SinglePartition`, the perf doesn't matter as the data is small and we
only use one task to process it. It doesn't worth the cost of triggering the
partition listing during planning. We should just remove this if branch.
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