wiedld commented on code in PR #14821:
URL: https://github.com/apache/datafusion/pull/14821#discussion_r1975847459
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datafusion/core/tests/physical_optimizer/enforce_sorting.rs:
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@@ -2242,7 +2242,7 @@ async fn
test_window_partial_constant_and_set_monotonicity() -> Result<()> {
" DataSourceExec: file_groups={1 group: [[x]]},
projection=[nullable_col, non_nullable_col], output_ordering=[nullable_col@0
ASC NULLS LAST], file_type=parquet",
],
expected_plan: vec![
- "SortExec: expr=[non_nullable_col@1 ASC NULLS LAST, count@2
ASC NULLS LAST], preserve_partitioning=[false]",
+ "SortExec: expr=[non_nullable_col@1 ASC NULLS LAST],
preserve_partitioning=[false]",
Review Comment:
This test change is actually ok.
The window agg is unpartitioned, and unbounded. Therefore the count value is
constant across all rows; and therefore can be removed from the `SortExec`.
Therefore we think this change is an improvement.
The reason this plan got better is because the `pushdown_sorts` is now
recreating the sort from the eq props (that removes the constants), rather than
re-attaching the existing sort node (as does main).
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