Github user kevinyu98 commented on a diff in the pull request: https://github.com/apache/spark/pull/9720#discussion_r45028090 --- Diff: sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala --- @@ -280,6 +280,12 @@ object HiveTypeCoercion { case p @ BinaryComparison(left @ DateType(), right @ TimestampType()) => p.makeCopy(Array(Cast(left, StringType), Cast(right, StringType))) + // Checking NullType + case p @ BinaryComparison(left @ StringType(), right @ NullType()) => + p.makeCopy(Array(left, Literal.create(null, StringType))) + case p @ BinaryComparison(left @ NullType(), right @ StringType()) => + p.makeCopy(Array(Literal.create(null, StringType), right)) + case p @ BinaryComparison(left @ StringType(), right) if right.dataType != StringType => p.makeCopy(Array(Cast(left, DoubleType), right)) --- End diff -- @cloud-fan : do you want me to open a new jira to look into this? The new jira/pr will focus on the rules in PromoteStrings and ImplicitTypeCasts, as you suggested to reduce the redundant rules in PromoteStrings.
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