Check out the ColumnVisibility class. Some effort is taken to ensure
that ColumnVisibilities are normalized yet logically-equivalent.
As far as compression goes, this would be handled at the file level
(compress a sorted collection of Keys) instead of a the ColumnVisibility
level. Check out RelativeKey  for some of that logic.
On 2/17/14, 7:30 PM, Sitaraman Vilayannur wrote: