Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/1002#issuecomment-213015103
JDK can be easily varied in many environments. For example, some machines
in a cluster can use SUN JDK, and other machines can use open JDK or others.
Also, JDK 9 will be released in this year. This problem is about the trade-off
relationship between convenient and less mistake. If I should catch only one of
them, I'd like to choose less mistake.
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