Sitaraman,

Check out the ColumnVisibility[1] 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 [2] for some of that logic.

- Josh

[1]
https://github.com/apache/accumulo/blob/1.5.0/core/src/main/java/org/apache/accumulo/core/security/ColumnVisibility.java
[2]
https://github.com/apache/accumulo/blob/1.5.0/core/src/main/java/org/apache/accumulo/core/file/rfile/RelativeKey.java

On 2/17/14, 7:30 PM, Sitaraman Vilayannur wrote:
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