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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