Matthias Boehm created SYSTEMML-1791:

             Summary: Performance features frame blocks
                 Key: SYSTEMML-1791
             Project: SystemML
          Issue Type: Task
            Reporter: Matthias Boehm

Recent experiments have shown that there are unnecessary overheads in various 
frame block operations. This task is an umbrella for all related performance 
improvements. In detail, this includes:

* Shallow copy for column indexing
* Bidirectional reuse of recode maps in meta data frames
* Avoid unnecessary long-string-double parsing on transformapply

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