Github user cloud-fan commented on a diff in the pull request:
https://github.com/apache/spark/pull/19602#discussion_r191104615
--- Diff:
sql/hive/src/main/scala/org/apache/spark/sql/hive/client/HiveShim.scala ---
@@ -657,18 +656,46 @@ private[client] class Shim_v0_13 extends Shim_v0_12 {
val useAdvanced = SQLConf.get.advancedPartitionPredicatePushdownEnabled
+ object ExtractAttribute {
+ def unapply(expr: Expression): Option[Attribute] = {
+ expr match {
+ case attr: Attribute => Some(attr)
+ case cast @ Cast(child, dt: StringType, _) if
child.dataType.isInstanceOf[NumericType] =>
+ unapply(child)
+ case cast @ Cast(child, dt: NumericType, _) if child.dataType ==
StringType =>
--- End diff --
I think we should only support safe upcast, `cast("1.234" as int)` should
be excluded. Can we follow `Cast.mayTruncate` strictly?
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