xudong963 commented on code in PR #14569:
URL: https://github.com/apache/datafusion/pull/14569#discussion_r1948961642
##########
datafusion/core/tests/physical_optimizer/enforce_sorting.rs:
##########
@@ -1943,6 +1943,30 @@ async fn test_remove_unnecessary_spm1() -> Result<()> {
Ok(())
}
+#[tokio::test]
+async fn test_remove_unnecessary_spm2() -> Result<()> {
+ let schema = create_test_schema()?;
+ let source = memory_exec(&schema);
+ let input = sort_preserving_merge_exec_with_fetch(
+ vec![sort_expr("non_nullable_col", &schema)],
+ source,
+ 100,
+ );
+
+ let expected_input = [
+ "SortPreservingMergeExec: [non_nullable_col@1 ASC], fetch=100",
+ " DataSourceExec: partitions=1, partition_sizes=[0]",
+ ];
+ let expected_optimized = [
+ "LocalLimitExec: fetch=100",
+ " SortExec: expr=[non_nullable_col@1 ASC],
preserve_partitioning=[false]",
Review Comment:
we should optimize such pattern to topk later
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