leanken commented on pull request #30354:
URL: https://github.com/apache/spark/pull/30354#issuecomment-726033664
```
abstract class Rule[TreeType <: TreeNode[_]] extends Logging {
/** Name for this rule, automatically inferred based on class name. */
val ruleName: String = {
val className = getClass.getName
if (className endsWith "$") className.dropRight(1) else className
}
def apply(plan: TreeType): TreeType
def conf: SQLConf = SQLConf.get
}
```
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