Re: Low Performance of full scan.

Posted by xm_zzc on Sep 20, 2018; 4:07pm
URL: http://apache-carbondata-dev-mailing-list-archive.168.s1.nabble.com/Low-Performance-of-full-scan-tp62859p62938.html

Hi chuanyin:
  I used SQL1 and SQL2 as test cases and ran on local[4] mode,
  when the rowNum of CarbonVectorProxy (actually it's the capacity of
ColumnarBatch) is 4 * 1024 (default):
  SQL1: 8s, 9s (run two times), SQL2: 12s, 11s
  but when it's 16 * 1024:
  SQL1: 6s, 6s,                         SQL2: 9s, 8s

  So the changing of this property benefits my two test cases.



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