> That won't work. External file fields > are currently only usable within > function queries, according to the Javadocs
Yes you are right, only function queries. However he can dump ids of white-colored items to a text file in the following format: 12278=20.0 9984=20.0 issue a commit and filter out these sold-out items at query time by &fq={!frange l=1 u=30}externalFileFieldName Though not sure this is what he is after.