: Is there a way? I could make the documents containing field A have
: another field B equals some flag, and then query for that flag, but
: that would be kind of inefficient.
There is space efficienty and there is time effeciency.
if there was only only value for field B (ie: "true" or "yes") then as
long as you only index it (with omitNorm=true) and don't "store" it, it
would acctually be fairly space efficient.
without adding any new fields: a RangeFilter (or ConsantScoreRangeQuery)
on field A with both a null lower and upper bound will find all docs with
any value in the field A -- but a TermQuery("B", "yes") is probably going
to be more efficinet in terms of query time.
-Hoss
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