Github user srowen commented on a diff in the pull request:
https://github.com/apache/spark/pull/5489#discussion_r28233582
--- Diff: core/src/test/scala/org/apache/spark/rdd/DoubleRDDSuite.scala ---
@@ -18,10 +18,17 @@
package org.apache.spark.rdd
import org.scalatest.FunSuite
+import org.scalatest.Matchers._
import org.apache.spark._
class DoubleRDDSuite extends FunSuite with SharedSparkContext {
+ test("sum") {
+ sc.parallelize(Seq.empty[Double]).sum() should be(0.0 +- 0.0001)
--- End diff --
Doubles aren't unstable; `0.0 == 0.0` always. Yes i know what you mean but
in these cases we can expect the result to exact to machine precision, always.
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