Github user feynmanliang commented on the pull request:
https://github.com/apache/spark/pull/8534#issuecomment-136513498
@taishi-oss these were already in spark prior to 1.6, please see the
[parent JIRA](https://issues.apache.org/jira/browse/SPARK-7751) for how to
track down the correct version number to use in the @since annotations.
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