Wenchen Fan 4d5de4d303 [SPARK-23697][CORE] LegacyAccumulatorWrapper should define isZero correctly ... ## What changes were proposed in this pull request? It's possible that Accumulators of Spark 1.x may no longer work with Spark 2.x. This is because `LegacyAccumulatorWrapper.isZero` may return wrong answer if `AccumulableParam` doesn't define equals/hashCode. This PR fixes this by using reference equality check in `LegacyAccumulatorWrapper.isZero`. ## How was this patch tested? a new test Author: Wenchen Fan <wenchen@databricks.com> Closes #21229 from cloud-fan/accumulator.		2018-05-04 19:20:15 +08:00
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src	[SPARK-23697][CORE] LegacyAccumulatorWrapper should define isZero correctly	2018-05-04 19:20:15 +08:00
pom.xml	[SPARK-23807][BUILD] Add Hadoop 3.1 profile with relevant POM fix ups	2018-04-24 09:57:09 -07:00