beliefer commented on a change in pull request #34779:
URL: https://github.com/apache/spark/pull/34779#discussion_r764564803



##########
File path: 
sql/core/src/main/scala/org/apache/spark/sql/SparkSessionExtensions.scala
##########
@@ -42,6 +42,7 @@ import org.apache.spark.sql.execution.{ColumnarRule, 
SparkPlan}
  * <li>Check Analysis Rules.</li>
  * <li>Optimizer Rules.</li>
  * <li>Pre CBO Rules.</li>
+ * <li>Early Scan Push-Down</li>

Review comment:
       I feel that the name of `Pre-CBO Rules` is too wide and the meaning in 
the 
[comment](https://github.com/apache/spark/blob/9596820a473241928b198c1057f4ac662c77dc08/sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/Optimizer.scala#L212)
 is not the same. In my opinion we should not limit the flexibility because of 
this name.




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