Virtual Columns is now mainly used for IO information, like file name, block offset.
The reason of pushing to RowResolver is to be able to select on these columns. On Wed, Apr 13, 2011 at 6:25 AM, bharath vissapragada <bharathvissapragada1...@gmail.com> wrote: > Hi all, > > What is the use of the class "VirtualColumn" ? Why are they are always > pushed into the the RowResolver to create a TableScanDesc ? > > Any help is highly appreciated ! > > -- > Regards, > Bharath .V > w:http://research.iiit.ac.in/~bharath.v >
