Chris Lu wrote:
Allahbaksh,
If you ONLY want to find all document with a particular field that is
not null, you can loop through the TermEnum and TermDocs to find all the
document ids.
But this can not easily be combined with other queries.
Surely this would be equivalent to a PrefixQuery with a prefix of "".
Assuming the query parser is well behaved (I can no longer remember
whether the default one is or not), field:* should create one.
This is assuming you have already indexed the data. If you can reindex
then clearly adding a placeholder value for "no content" is more efficient.
Daniel
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