Empty/non-empty field indexing question

[[EMAIL PROTECTED]]

Here's probably a silly question, very newbish, but I had to ask.
Since I have mysql documents that contain over 30 fields each and most of them
are added to the index, is it a common practice to add fields to the index with 
empty values, for that perticular record, or should the field be totally omitted.

What I mean is if let's say a Title field is empty on a specific record (in 
mysql)
should I still add that field into Lucene index with an empty value or just
skip it and only add the fields that contain non-empty values?
thanks
-pedja

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