sunil goyal wrote:

But can i do for instance a unified query where i want to take certain
parameters (non-textual e.g. age < 30 ) from relational databases and
keywords from the lucene index ?



When I have had to do this, I've done the lucene search first, and then manually filtered out the hits that fail on other criteria.

I'd suggest doing that first (as it's easiest) and then seeing whether the performance is acceptable.

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