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The "FileFormatDesignDoc" page has been changed by StuHood.
http://wiki.apache.org/cassandra/FileFormatDesignDoc?action=diff&rev1=31&rev2=32

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  The parent change flag and type information can be represented compactly 
using a bitmap.
  
  === Field reordering ===
+ 
+ ** NB: field reordering will likely not be implemented in initial versions of 
the format **
  
  One weakness of the implementation so far is that it preserves the order of 
tuples within a level. This approach performs well for wide rows with high 
field cardinality, since adding compression is unlikely to remove data.
  

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