mustafasrepo commented on issue #8572:
URL:
https://github.com/apache/arrow-datafusion/issues/8572#issuecomment-1862321943
By second I mean from bottom to top. In your original example
```sql
"SortPreservingMergeExec: [a@0 ASC NULLS LAST]",
" SortExec: expr=[a@0 ASC NULLS LAST]",
" RepartitionExec: partitioning=Hash([c@1], 8), input_partitions=8",
" RepartitionExec: partitioning=RoundRobinBatch(8),
input_partitions=1",
" CsvExec: file_groups={1 group: [[file_path]]}, projection=[a,
c, d], output_ordering=[a@0 ASC NULLS LAST], has_header=true",
```
`RepartitionExec` immediately below the `SortExec` has input partition 8.
Other plan would be
```sql
"SortPreservingMergeExec: [a@0 ASC NULLS LAST]",
" RepartitionExec: partitioning=Hash([c@1], 8), input_partitions=8,
preserve_order=true",
" RepartitionExec: partitioning=RoundRobinBatch(8),
input_partitions=1",
" CsvExec: file_groups={1 group: [[file_path]]}, projection=[a, c,
d], output_ordering=[a@0 ASC NULLS LAST], has_header=true",
```
In this case `streaming_merge` will be used in the internal of second
`RepartitionExec`
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