Github user jiangxb1987 commented on a diff in the pull request:
https://github.com/apache/spark/pull/15059#discussion_r78725648
--- Diff:
sql/catalyst/src/test/scala/org/apache/spark/sql/catalyst/expressions/ExpressionEvalHelper.scala
---
@@ -289,13 +290,32 @@ trait ExpressionEvalHelper extends
GeneratorDrivenPropertyChecks {
(result, expected) match {
case (result: Array[Byte], expected: Array[Byte]) =>
java.util.Arrays.equals(result, expected)
- case (result: Double, expected: Spread[Double @unchecked]) =>
- expected.asInstanceOf[Spread[Double]].isWithin(result)
case (result: Double, expected: Double) if result.isNaN &&
expected.isNaN =>
true
+ case (result: Double, expected: Double) =>
+ relativeErrorComparison(result, expected)
case (result: Float, expected: Float) if result.isNaN &&
expected.isNaN =>
true
case _ => result == expected
}
}
+
+ /**
+ * Private helper function for comparing two values using relative
tolerance.
+ * Note that if x or y is extremely close to zero, i.e., smaller than
Double.MinPositiveValue,
+ * the relative tolerance is meaningless, so the exception will be
raised to warn users.
+ */
+ private def relativeErrorComparison(x: Double, y: Double, eps: Double =
1E-8): Boolean = {
--- End diff --
I've add comment to indicate the problem. Thank you!
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