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In PIG-2532, we fix this issue in load side, but we still have issue in store side, see http://mail-archives.apache.org/mod_mbox/incubator-hcatalog-user/201206.mbox/%3CCAB2zpW9MY6t-NMdOJ-%2B0ezt0NJOFrxsJ7kc%3DR4WJh%2Bn-9bDW2g%40mail.gmail.com%3E