berkaysynnada commented on code in PR #14919:
URL: https://github.com/apache/datafusion/pull/14919#discussion_r1976434591
##########
datafusion/core/tests/physical_optimizer/enforce_sorting.rs:
##########
@@ -3346,3 +3351,62 @@ async fn
test_window_partial_constant_and_set_monotonicity() -> Result<()> {
Ok(())
}
+
+#[tokio::test]
+async fn test_preserve_needed_coalesce() -> Result<()> {
+ // Input to EnforceSorting, from our test case.
+ let plan = projection_exec_with_alias(
+ union_exec(vec![parquet_exec_with_stats(); 2]),
+ vec![
+ ("a".to_string(), "a".to_string()),
+ ("b".to_string(), "value".to_string()),
+ ],
+ );
+ let plan = Arc::new(CoalescePartitionsExec::new(plan));
+ let schema = schema();
+ let sort_key = LexOrdering::new(vec![PhysicalSortExpr {
+ expr: col("a", &schema).unwrap(),
+ options: SortOptions::default(),
+ }]);
+ let plan: Arc<dyn ExecutionPlan> =
+ single_partitioned_aggregate(plan, vec![("a".to_string(),
"a1".to_string())]);
+ let plan = sort_exec(sort_key, plan);
+
+ // Starting plan: as in our test case.
+ assert_eq!(
+ get_plan_string(&plan),
+ vec![
+ "SortExec: expr=[a@0 ASC], preserve_partitioning=[false]",
+ " AggregateExec: mode=SinglePartitioned, gby=[a@0 as a1],
aggr=[]",
Review Comment:
> Our Union outputs multiple partitions, and the AggregateExec;mode=Partial
can take multiple partitions. Therefore the enforce distribution should not
have inserted the coalesce?
It might insert a coalesce, but then it has to update `AggregateExec:
mode=FinalPartitioned` to `AggregateExec: mode=Final`
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