Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/10646#discussion_r49359015
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/trees/TreeNode.scala
---
@@ -26,17 +26,14 @@ import org.json4s.JsonAST._
import org.json4s.JsonDSL._
import org.json4s.jackson.JsonMethods._
-import org.apache.spark.SparkContext
import org.apache.spark.rdd.{EmptyRDD, RDD}
-import org.apache.spark.sql.catalyst.{ScalaReflectionLock, TableIdentifier}
+import org.apache.spark.SparkContext
import org.apache.spark.sql.catalyst.ScalaReflection._
+import org.apache.spark.sql.catalyst.ScalaReflectionLock
import org.apache.spark.sql.catalyst.errors._
import org.apache.spark.sql.catalyst.expressions._
-import org.apache.spark.sql.catalyst.plans.logical.Statistics
-import org.apache.spark.sql.catalyst.util.DateTimeUtils
import org.apache.spark.sql.types._
import org.apache.spark.storage.StorageLevel
-import org.apache.spark.unsafe.types.{CalendarInterval, UTF8String}
--- End diff --
oh, it's fine to remove useless imports.
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