Github user viirya commented on a diff in the pull request: https://github.com/apache/spark/pull/20858#discussion_r176901317 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Expression.scala --- @@ -699,3 +699,88 @@ abstract class TernaryExpression extends Expression { * and Hive function wrappers. */ trait UserDefinedExpression + +/** + * The trait covers logic for performing null save evaluation and code generation. --- End diff -- typo: null safe.
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