Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/7754#discussion_r35820197
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/HiveTypeCoercion.scala
---
@@ -639,6 +640,24 @@ object HiveTypeCoercion {
}
/**
+ * Turns Add/Subtract of DateType/TimestampType and IntervalType to
TimeAdd/TimeSub
+ */
+ object DateTimeOperations extends Rule[LogicalPlan] {
+ def apply(plan: LogicalPlan): LogicalPlan = plan
transformAllExpressions {
+ // Skip nodes who's children have not been resolved yet.
+ case e if !e.childrenResolved => e
+
+ case Add(left, right) if left.dataType == IntervalType =>
+ Add(right, left) // switch the order
+
+ case Add(left, right) if right.dataType == IntervalType =>
+ Cast(TimeAdd(Cast(left, TimestampType), right), left.dataType)
--- End diff --
this implicitly casts all types to TimestampType. How about requiring left
to be string, date, or timestamp?
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