Github user xwu0226 commented on a diff in the pull request:
https://github.com/apache/spark/pull/14842#discussion_r78268705
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/SortOrder.scala
---
@@ -71,12 +95,34 @@ case class SortPrefix(child: SortOrder) extends
UnaryExpression {
val nullValue = child.child.dataType match {
case BooleanType | DateType | TimestampType | _: IntegralType =>
- Long.MinValue
+ if ((child.isAscending && child.nullOrdering == NullFirst) ||
+ (!child.isAscending && child.nullOrdering == NullLast)) {
+ Long.MinValue
--- End diff --
without NULL ordering clause, the default behavior is that for ASC, null
rows will be placed first as if smallest value and for DESC, null rows will be
placed last as if smallest value also.
Now with NULL ordering clause, NULL FIRST|LAST is independent of ASC or
DESC.
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