guiyanakuang commented on pull request #952:
URL: https://github.com/apache/orc/pull/952#issuecomment-962796005


   > @guiyanakuang I am wondering whether the selected vector only applies to 
the root struct-typed column vector. And I am curious if this patch is a part 
of some other big work items?
   
   @wgtmac Yes, the selected marker is at the row level. It will only work on 
the root.  The purpose of this pr is to resolve 
[issue](https://issues.apache.org/jira/projects/ORC/issues/ORC-1004?filter=allopenissues).
 This feature helps me to write the results to the ORC file by filtering, which 
is useful for creating materialized views. It just happens to be useful for my 
current work, so I implemented it


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