Hi John,

1. Can you please point us to a document on fastbit index/data file formats, or 
just a high level explain?

2. Is index/data file good for sparse value changes? 

For example, "Table" person (user_id, gender, class). Indexed column is 
"gender". We already have fastbit index/data files on "gender".  
Next day, a couple of persons update their genders. Can we efficiently update 
"index/data" files, instead of re-creating these files?

Thanks for your time in advance. 

Jilong Wang


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