Github user hyunsik commented on the pull request:
https://github.com/apache/tajo/pull/621#issuecomment-121734623
Also, I'm writing a documentation for error propagation and exception usage
guide in Tajo.
https://cwiki.apache.org/confluence/display/TAJO/Exception+Propagation
I hope that it would be helpful for you guys to understand my changes.
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