1. A system comprising: one or more processors; and program code including a query optimizer, the program code configured to be executed by the one or more processors to process a database query, the program code configured to: create an access control bit mapping (ACBM) structure for a database table in a memory, wherein the ACBM structure includes a relative record number (RRN) bit map, the RRN bit map describing access rights for a parameter; determine one or more statistics describing the RRN bit map; and update the ACBM structure, the update including modifying an RRN bit map value.