yuhao yang created SPARK-14760:
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             Summary: Feature transformers should always invoke transformSchema 
in transform or fit
                 Key: SPARK-14760
                 URL: https://issues.apache.org/jira/browse/SPARK-14760
             Project: Spark
          Issue Type: Improvement
          Components: ML
            Reporter: yuhao yang
            Priority: Minor


Since one of the primary function for transformSchema is to conduct parameter 
validation, transformers should always invoke transformSchema in transform and 
fit.



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