Github user marmbrus commented on a diff in the pull request:
https://github.com/apache/spark/pull/9840#discussion_r45769885
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1169,3 +1170,34 @@ object ComputeCurrentTime extends Rule[LogicalPlan] {
}
}
}
+
+/**
+ * Replace the `UpCast` expression by `Cast`, and throw exceptions if the
cast may truncate.
+ */
+object RemoveUpCast extends Rule[LogicalPlan] {
+ private def fail(from: DataType, to: DataType) = {
+ throw new AnalysisException(
+ s"Cannot up cast ${from.simpleString} to ${to.simpleString} as it
may truncate")
--- End diff --
I think it might be good to include the awesome path error messages that we
use when we fail to resolve here as well. We might also suggest ways to fix it
(i.e. "either add an explicit cast to the input data or choose a higher
precision type in the target object").
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