Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/15713
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GitHub user a-roberts opened a pull request:
https://github.com/apache/spark/pull/15713
[SPARK-18196] [CORE] Optimise CompactBuffer implementation
## What changes were proposed in this pull request?
See the JIRA for details - summary is slightly increased footprint in the
class
