zhuqi-lucas commented on code in PR #14569:
URL: https://github.com/apache/datafusion/pull/14569#discussion_r1948589383
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datafusion/core/tests/physical_optimizer/enforce_sorting.rs:
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@@ -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 = [
+ "SortPreservingMergeExec: [non_nullable_col@1 ASC], fetch=100",
Review Comment:
I mean for the only one partition case, we can optimize further to have only
sortExec with Topk(fetch).
May be a follow-up jira.
Correct me if i am wrong, thanks!
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