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From tianyi <>
Subject [GitHub] spark pull request: [SPARK-4483][SQL]Optimization about reduce mem...
Date Tue, 25 Nov 2014 06:33:01 GMT
Github user tianyi commented on the pull request:
    I made some optimization for the performance. Here is the result:
    the test data is generated by the following script
    echo $i",abcdefghijklmn"
    benchmark codes:
    table test_csv contain 1 million records
    table dim_csv contain 10 thousand records
    the result is:
    CSV: 12671 ms
    CSV: 9021 ms
    CSV: 9200 ms
    Current Mem Usage:787788984
    after patch´╝Ü
    CSV: 10382 ms
    CSV: 7543 ms
    CSV: 7469 ms
    Current Mem Usage:208145728

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