dongjoon-hyun commented on code in PR #44480:
URL: https://github.com/apache/spark/pull/44480#discussion_r1436674275
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sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/optimizer/UnwrapCastInBinaryComparison.scala:
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@@ -144,6 +144,21 @@ object UnwrapCastInBinaryComparison extends
Rule[LogicalPlan] {
value != null =>
Some(unwrapTimestampToDate(be, fromExp, ts, timeZoneId, evalMode))
+ // Timestamp/Timestamp_NTZ -> Timestamp_NTZ/Timestamp
+ case be @ BinaryComparison(
+ c @ Cast(fromExp, _, timeZoneId, evalMode), Literal(value, literalType))
+ if AnyTimestampType.acceptsType(fromExp.dataType) &&
+ AnyTimestampType.acceptsType(literalType) && value != null =>
+ // datetime with timezone is tricky, do a round trip to check if the
rewrite is okay.
+ val newCast = Cast(Literal(value, literalType), fromExp.dataType,
timeZoneId, evalMode)
+ val roundTrip = Cast(newCast, literalType, timeZoneId, evalMode)
Review Comment:
Ya, this looks safe.
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