Github user asfgit closed the pull request at:
https://github.com/apache/spark/pull/18585
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GitHub user Shanshan-IC opened a pull request:
https://github.com/apache/spark/pull/18585
SPARK-21359
## What changes were proposed in this pull request?
As described in https://issues.apache.org/jira/browse/SPARK-21359
add new functions for frequency discretizer
