Github user ueshin commented on a diff in the pull request:
https://github.com/apache/spark/pull/22448#discussion_r218337303
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/TypeCoercion.scala
---
@@ -31,6 +32,7 @@ import org.apache.spark.sql.internal.SQLConf
import org.apache.spark.sql.types._
+
--- End diff --
nit: revert this?
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