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From Sean McNamara <>
Subject complex types and ORC
Date Mon, 29 Apr 2013 23:26:50 GMT
If I create a table that has a map<string, string> field, will ORC files columnarize
by the keys in the map?  Or will all the pairs in the map be grouped together?

My goal is to columnarize the storage of a variable number of fields (where the names and
number of fields are unknown at schema creation).  It does not appear to be possible with
RCFILE, and I'm curious if ORC just adds better type support, or if they also columnarize
the fields within complex types.



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