sqlite_create_aggregate
sqlite_create_aggregate(db, aAggs[i].zName,
sqlite_create_aggregate(db, "md5sum", -1, md5step, md5finalize, 0);
sqlite_create_aggregate(db, "x_count", 0, countStep, countFinalize, 0);
sqlite_create_aggregate(db, "x_count", 1, countStep, countFinalize, 0);