Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/21331#discussion_r189714473
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Canonicalize.scala
---
@@ -17,6 +17,8 @@
package org.apache.spark.sql.catalyst.expressions
+import org.apache.spark.sql.catalyst.util.TypeUtils
--- End diff --
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