question: public boolean update ( CacheObject key , CacheObject val , long expirationTime , boolean rmv ) throws IgniteCheckedException { assert desc != null ; GridH2Row row = desc . createRow ( key , val , expirationTime ) ; if ( ! rmv ) ( ( GridH2AbstractKeyValueRow ) row ) . valuesCache ( new Value [ getColumns ( ) . length ] ) ; try { return doUpdate ( row , rmv ) ; } finally { if ( ! rmv ) ( ( GridH2AbstractKeyValueRow ) row ) . valuesCache ( null ) ; } }
target:  Updates table for given key. If value is null then row with given key will be removed from table, otherwise value and expiration time will be updated or new row will be added.