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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