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Posted to issues@spark.apache.org by "Xiangrui Meng (JIRA)" <ji...@apache.org> on 2016/06/20 18:31:57 UTC

[jira] [Created] (SPARK-16075) Make VectorUDT/MatrixUDT singleton under spark.ml package

Xiangrui Meng created SPARK-16075:
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             Summary: Make VectorUDT/MatrixUDT singleton under spark.ml package
                 Key: SPARK-16075
                 URL: https://issues.apache.org/jira/browse/SPARK-16075
             Project: Spark
          Issue Type: Improvement
          Components: MLlib
    Affects Versions: 2.0.0
            Reporter: Xiangrui Meng
            Assignee: Xiangrui Meng


Both VectorUDT and MatrixUDT are implemented as normal classes and their could be multiple instances of it, which makes the equality checking and pattern matching harder to implement. Even the APIs are private, switching to a singleton pattern could simplify the development.

Required changes:
* singleton VectorUDT/MatrixUDT
* add UDTFactory trait with getOrCreate to return the singleton instance
* update UDTRegistration
* update code generation to support UDTFactory



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