ahmetenis opened a new pull request, #9125:
URL: https://github.com/apache/arrow-datafusion/pull/9125
## Which issue does this PR close?
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Closes #.
## Rationale for this change
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In the default configuration, the naive planner frequently employs the
`SortExec` mechanism to ensure data is correctly ordered. This `SortExec`
utilization poses a challenge, particularly in streaming environments. The
inherent nature of `SortExec` demands access to the entire dataset for sorting,
a requirement in conflict with the streaming model, which processes data in
chunks rather than as a whole.
However, if a table has an order like `[a ASC, b ASC]` and a lexicographical
sort of `[a ASC, b ASC, d ASC]` is needed, the `d` column might be sorted
without accessing the whole dataset in many practical cases.
The primary objective is to optimize the naive planner to eliminate the
necessity of materializing the entire dataset with `SortExec`, especially in
streaming scenarios and certain use cases.
## What changes are included in this PR?
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## Are these changes tested?
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- Unit tests added for enforce_sorting subrule replacing SortExec plan with
PartialSortExec plan
- Unit tests added for PartialSortExec
## Are there any user-facing changes?
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