zhuqi-lucas commented on code in PR #18817:
URL: https://github.com/apache/datafusion/pull/18817#discussion_r2554059927
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datafusion/sqllogictest/test_files/topk.slt:
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@@ -338,9 +338,7 @@ physical_plan
query TT
explain select number, letter, age from partial_sorted order by number asc
limit 3;
----
-physical_plan
-01)SortExec: TopK(fetch=3), expr=[number@0 ASC NULLS LAST],
preserve_partitioning=[false]
-02)--DataSourceExec: file_groups={1 group:
[[WORKSPACE_ROOT/datafusion/sqllogictest/test_files/scratch/topk/partial_sorted/1.parquet]]},
projection=[number, letter, age], output_ordering=[number@0 DESC, letter@1 ASC
NULLS LAST], file_type=parquet, predicate=DynamicFilter [ empty ]
Review Comment:
Reverse scan make it don't need to sort here, and it's very fast.
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