cloud-fan commented on a change in pull request #34779:
URL: https://github.com/apache/spark/pull/34779#discussion_r763135859
##########
File path:
sql/core/src/main/scala/org/apache/spark/sql/SparkSessionExtensions.scala
##########
@@ -226,6 +226,21 @@ class SparkSessionExtensions {
preCBORules += builder
}
+ private[this] val earlyScanPushDownRules = mutable.Buffer.empty[RuleBuilder]
+
+ private[sql] def buildEarlyScanPushDownRules(session: SparkSession):
Seq[Rule[LogicalPlan]] = {
+ earlyScanPushDownRules.map(_.apply(session)).toSeq
+ }
+
+ /**
+ * Inject an optimizer `Rule` builder that rewrites logical plans into the
[[SparkSession]].
+ * The injected rules will be executed once after the operator optimization
batch and
+ * after any push down optimization rules.
+ */
+ def injectEarlyScanPushDownRule(builder: RuleBuilder): Unit = {
Review comment:
Let's update the classdoc, which only mentions
```
* This current provides the following extension points:
*
* <ul>
* <li>Analyzer Rules.</li>
* <li>Check Analysis Rules.</li>
* <li>Optimizer Rules.</li>
* <li>Pre CBO Rules.</li>
* <li>Planning Strategies.</li>
* <li>Customized Parser.</li>
* <li>(External) Catalog listeners.</li>
* <li>Columnar Rules.</li>
* <li>Adaptive Query Stage Preparation Rules.</li>
* </ul>
```
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