Github user jihoonson commented on the pull request:
https://github.com/apache/tajo/pull/521#issuecomment-90864387
Thanks @jinossy.
The problem seems the memory overflow, especially related to the permanent
generation space.
So, I increased the ```permSize``` from 128 MB to 152 MB in this patch.
Additionally, I reduced the number of test tuples of TestExternalSortExec
from 3,000,000 to 100,000.
If there are any objections, I'll commit soon.
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