gatorsmile commented on a change in pull request #21586: [SPARK-24586][SQL]
Upcast should not allow casting from string to other types
URL: https://github.com/apache/spark/pull/21586#discussion_r284842999
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File path:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/Cast.scala
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@@ -120,35 +120,36 @@ object Cast {
}
/**
- * Return true iff we may truncate during casting `from` type to `to` type.
e.g. long -> int,
- * timestamp -> date.
+ * Returns true iff we can safely up-cast the `from` type to `to` type
without any truncating or
+ * precision lose or possible runtime failures. For example, long -> int,
string -> int are not
+ * up-cast.
*/
- def mayTruncate(from: DataType, to: DataType): Boolean = (from, to) match {
Review comment:
I know this will be ugly, but I still prefer to adding a conf for falling
back to the original behavior.
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