peter-toth commented on code in PR #53019:
URL: https://github.com/apache/spark/pull/53019#discussion_r2519510109
##########
sql/core/src/main/scala/org/apache/spark/sql/execution/SparkOptimizer.scala:
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@@ -61,8 +61,8 @@ class SparkOptimizer(
new RowLevelOperationRuntimeGroupFiltering(OptimizeSubqueries)),
Batch("InjectRuntimeFilter", FixedPoint(1),
InjectRuntimeFilter),
- Batch("MergeScalarSubqueries", Once,
- MergeScalarSubqueries,
+ Batch("MergeSubplans", Once,
+ MergeSubplans,
Review Comment:
BTW, I deliberately chose a general rule name like `MergeSubplans` instead
of something specific like `MergeOneRowResultSubplans`, as I'm hoping that I
can continue improving the rule in the future with
[SPARK-40193](https://issues.apache.org/jira/browse/SPARK-40193) /
https://github.com/apache/spark/pull/37630 to be able to merge different
filters; and then extend the rule to handle subplans that return multiple rows.
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