cloud-fan commented on a change in pull request #32944:
URL: https://github.com/apache/spark/pull/32944#discussion_r662517185
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File path:
sql/core/src/main/scala/org/apache/spark/sql/execution/adaptive/costing.scala
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@@ -17,16 +17,32 @@
package org.apache.spark.sql.execution.adaptive
+import org.apache.spark.internal.Logging
import org.apache.spark.sql.execution.SparkPlan
+import org.apache.spark.util.Utils
/**
- * Represents the cost of a plan.
+ * An interface to represent the cost of a plan.
*/
trait Cost extends Ordered[Cost]
/**
- * Evaluates the cost of a physical plan.
+ * An interface to evaluate the cost of a physical plan.
*/
trait CostEvaluator {
def evaluateCost(plan: SparkPlan): Cost
}
+
+object CostEvaluator extends Logging {
+
+ /**
+ * Instantiates a [[CostEvaluator]] using the given className.
+ */
+ def instantiate(className: String): CostEvaluator = {
+ logDebug(s"Creating CostEvaluator $className")
+ val clazz = Utils.classForName[CostEvaluator](className)
Review comment:
We can use the standard API in Spark: `Utils.loadExtensions`
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