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From "Quanlong Huang (JIRA)" <j...@apache.org>
Subject [jira] [Created] (ORC-450) [C++] Support selecting list indices without materializing list items
Date Sat, 22 Dec 2018 01:37:00 GMT
Quanlong Huang created ORC-450:
----------------------------------

             Summary: [C++] Support selecting list indices without materializing list items
                 Key: ORC-450
                 URL: https://issues.apache.org/jira/browse/ORC-450
             Project: ORC
          Issue Type: Improvement
          Components: C++
            Reporter: Quanlong Huang


As we don't have a type id for index field of list type, if we just want to get the list indices,
we have to select the type id of the whole array, which cause unneccessary materializaion
on the array item.

The offset stream is stored sperately with the content stream. We are able to just materialize
the list indices.

We may need new interfaces in RowReaderOptions to specifiy this.



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