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Interpreting explain plan in hive

What are the key areas we need to check in the explain plan generated in Hive?
I have checked the documentation, it's not detailed about the above question.
I have similar kind of question asked in our forum, which is unanswered.
http://mail-archives.apache.org/mod_mbox/hive-user/201107.mbox/%3CCAAG3+[EMAIL PROTECTED]%3E

In summary, how we can distinguish a good/bad plan ?

Thanks for your help.