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3 check-ins related to "vtab-func-constraint"

Merge the ability to plan virtual table queries using overloaded functions. check-in: 2c2a202c user: drh tags: rtree-geopoly
Experimental change that allows overloaded functions to be analyzed by the xBestIndex method and used by the xFilter method of a virtual table. Leaf check-in: a353b1d7 user: drh tags: vtab-func-constraint
Store application-defined function names as lower-case to avoid the need for case conversions before calling xFindFunction on virtual tables. Avoid using lookaside to store the destructors for application defined functions, as lookaside should be reserved for transient allocations. check-in: 777189ce user: drh tags: trunk