Github user adrian-wang commented on a diff in the pull request:
https://github.com/apache/spark/pull/3396#discussion_r20839119
--- Diff: sql/hive/src/main/scala/org/apache/spark/sql/hive/HiveQl.scala ---
@@ -380,7 +380,7 @@ private[hive] object HiveQl {
protected def nameExpressions(exprs: Seq[Expression]):
Seq[NamedExpression] = {
exprs.zipWithIndex.map {
case (ne: NamedExpression, _) => ne
- case (e, i) => Alias(e, s"c_$i")()
+ case (e, i) => Alias(e, s"_c$i")()
--- End diff --
I checked hive-{0.9.0, 0.12.0, 0.13.1}, they all use _c as the default
auto-gen column alias prefix label.
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