Shafaq-Siddiqi opened a new pull request #883: Builtin "is_correct" for 
validation of data against a given schema
URL: https://github.com/apache/systemml/pull/883
 
 
   The built-in will validate the data in frame against a given schema. All 
non-conforming values will be converted into missing values (null in this case).
   usage: is_correct(Frame[String] data_frame, Frame[String] schema); schema is 
a row vector 
   ncol(data_frame) = ncol(schema).  

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