Yin Huai created HIVE-6632:
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             Summary: ORC should be able to only read needed fields in a 
complex column
                 Key: HIVE-6632
                 URL: https://issues.apache.org/jira/browse/HIVE-6632
             Project: Hive
          Issue Type: Improvement
            Reporter: Yin Huai


Currently, we use a string of ids to record needed columns. However, this 
string cannot record needed fields of a complex column. Although ORC decomposes 
a complex column to multiple sub-columns, it has to load the entire complex 
column if only a single field of this complex column is needed.



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