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From FRosner <...@git.apache.org>
Subject [GitHub] spark pull request: SPARK-11258 Remove quadratic runtime complexit...
Date Fri, 23 Oct 2015 07:09:22 GMT
Github user FRosner commented on the pull request:

    https://github.com/apache/spark/pull/9222#issuecomment-150494201
  
    @felixcheung the ticket is mentioning two numbers (https://issues.apache.org/jira/browse/SPARK-11258#)
in the description. For a small data frame it is already a speedup of 4. But anyway - quadratic
complexity is the problem as you run into issues with increasing number of columns quickly.
We were not even able to load one of our data frames (> 1 Million rows, several hundred
of columns) with the old method but it ran through with the new one.
    
    I can provide some more benchmarks later today.


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