private Location with(MemoryBlock page, long offsetInPage) {
            this.isDefined = true;
            this.memoryPage = page;
            updateAddressesAndSizes(page.getBaseObject(), offsetInPage);
            return this;
        }
Memory page containing the record. Only set if created by {@link BytesToBytesMap#iterator()}.
indexr-query-opt/src/main/java/org/apache/spark/unsafe/map/BytesToBytesMap.java