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Pig >> mail # user >> CONCAT(null, "something") == NULL ?


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CONCAT(null, "something") == NULL ?
looks a more intuitive result should be "something" , right?

but on my system it gave null
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Alan Gates 2012-11-02, 22:33
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Cheolsoo Park 2012-11-02, 22:40
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Yang 2012-11-05, 17:15
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Alan Gates 2012-11-05, 16:16
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Jonathan Coveney 2012-11-05, 18:01
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Cheolsoo Park 2012-11-02, 22:14
NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB