Github user hhbyyh commented on the pull request:

    https://github.com/apache/spark/pull/11601#issuecomment-215057260
  
    Thanks for helping review and the helpful discussion. I've read through the 
comments. Two major changes are:
    1. This initial PR does not include support for "mode" strategy. The 
preference is to implement "mode" for categorical features (metadata) and use 
DataFrame API.
    2. We'll support only FloatType and DoubleType for type safety.
    
    Preparing update now.


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