15. A computer program product for query processing, the computer program product comprising a computer usable storage medium having computer usable program code embodied therewith, the computer usable program code comprising computer usable program code configured to: receive a query, the query including a full text portion; compile an invariant part of the full text portion of the query; store the compiled invariant part of the full text portion; receive additional queries; and execute the additional queries by reusing the compiled invariant part.
15. A computer program product for query processing, the computer program product comprising a computer usable storage medium having computer usable program code embodied therewith, the computer usable program code comprising computer usable program code configured to: receive a query, the query including a full text portion; compile an invariant part of the full text portion of the query; store the compiled invariant part of the full text portion; receive additional queries; and execute the additional queries by reusing the compiled invariant part. 18. A computer program product according to claim 15 wherein execution of the additional queries comprises reusing a query expansion, a normalized scoring weight, and a set of posting lists.