Github user gczsjdy commented on a diff in the pull request:
https://github.com/apache/spark/pull/16476#discussion_r99753353
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/conditionalExpressions.scala
---
@@ -20,8 +20,12 @@ package org.apache.spark.sql.catalyst.expressions
import org.apache.spark.sql.catalyst.InternalRow
import org.apache.spark.sql.catalyst.analysis.TypeCheckResult
import org.apache.spark.sql.catalyst.expressions.codegen._
+import org.apache.spark.sql.catalyst.util.TypeUtils
import org.apache.spark.sql.types._
+import scala.annotation.tailrec
--- End diff --
Sorry, it's my fault.
I will run dev/scalastyle first before I push my changes next time.
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