Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/9840#discussion_r45830487
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/analysis/Analyzer.scala
---
@@ -1169,3 +1170,31 @@ object ComputeCurrentTime extends Rule[LogicalPlan] {
}
}
}
+
+/**
+ * Replace the `UpCast` expression by `Cast`, and throw exceptions if the
cast may truncate.
+ */
+object ResolveUpCast extends Rule[LogicalPlan] {
+ private def fail(from: Expression, to: DataType) = {
+ throw new AnalysisException(s"Cannot up cast `${from.prettyString}`
from " +
--- End diff --
Here I just use `prettyString` to show the field path like `a`, `a.b`,
should we also show the type path like we did before?
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