Github user rxin commented on a diff in the pull request:
https://github.com/apache/spark/pull/737#discussion_r12546829
--- Diff:
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/expressions/aggregates.scala
---
@@ -166,10 +167,48 @@ case class CountDistinct(expressions:
Seq[Expression]) extends AggregateExpressi
override def references = expressions.flatMap(_.references).toSet
override def nullable = false
override def dataType = IntegerType
- override def toString = s"COUNT(DISTINCT ${expressions.mkString(",")}})"
+ override def toString = s"COUNT(DISTINCT ${expressions.mkString(",")})"
override def newInstance() = new CountDistinctFunction(expressions, this)
}
+case class ApproxCountDistinctPartition(child: Expression)
+ extends AggregateExpression with trees.UnaryNode[Expression] {
--- End diff --
style feedback: 2 space indenting for "extends" (We only do 4 space
indenting for arguments)
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