I don't think I understood all that. Anyway, is there a way to fix this - either by rewriting the query or by creating an index? The output does match what I am expecting. It does take more than 10 times the time taken by Oracle for the same result, with PostgreSQL taking more than 20 minutes. I am sort of stuck on this since this query does get executed often. By the way, changing the filter from FAMNAM to GIVENNAME fetches results in 90 seconds. Probably there is a difference in the cardinality of values in these 2 columns.
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