[jira] [Created] (SPARK-19899) FPGrowth input column naming

["Maciej Szymkiewicz (JIRA)" <ji...@apache.org>]

Maciej Szymkiewicz created SPARK-19899:
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             Summary: FPGrowth input column naming
                 Key: SPARK-19899
                 URL: https://issues.apache.org/jira/browse/SPARK-19899
             Project: Spark
          Issue Type: Improvement
          Components: ML
    Affects Versions: 2.2.0
            Reporter: Maciej Szymkiewicz


Current implementation extends {{HasFeaturesCol}}. Personally I find it rather unfortunate. Up to these moment we used consistent conventions - if we mix-in  {{HasFeaturesCol}} the {{featuresCol}} should be {{VectorUDT}}. 

Using the same {{Param}} for an {{array<T>}} (and possibly for {{array<arrray<T>>}} once {{PrefixSpan}} is ported to {{ml}}) will be confusing for the users.

I would like to suggest adding new {{trait}} (let's say {{HasTransactionsCol}}) to clearly indicate that the input type differs for the other {{Estiamtors}}.



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