Cheng Lian a6d7b61f92 [SPARK-4479][SQL] Avoids unnecessary defensive copies when sort based shuffle is on ... This PR is a workaround for SPARK-4479. Two changes are introduced: when merge sort is bypassed in `ExternalSorter`, 1. also bypass RDD elements buffering as buffering is the reason that `MutableRow` backed row objects must be copied, and 2. avoids defensive copies in `Exchange` operator <!-- Reviewable:start --> [<img src="https://reviewable.io/review_button.png" height=40 alt="Review on Reviewable"/>](https://reviewable.io/reviews/apache/spark/3422) <!-- Reviewable:end --> Author: Cheng Lian <lian@databricks.com> Closes #3422 from liancheng/avoids-defensive-copies and squashes the following commits: 591f2e9 [Cheng Lian] Passes all shuffle suites 0c3c91e [Cheng Lian] Fixes shuffle write metrics when merge sort is bypassed ed5df3c [Cheng Lian] Fixes styling changes f75089b [Cheng Lian] Avoids unnecessary defensive copies when sort based shuffle is on		2014-11-24 12:43:45 -08:00
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src	[SPARK-4479][SQL] Avoids unnecessary defensive copies when sort based shuffle is on	2014-11-24 12:43:45 -08:00
pom.xml	Bumping version to 1.3.0-SNAPSHOT.	2014-11-18 21:24:18 -08:00