There was bug that is raised in  related to storing EUI-64 mac address in PostgreSQL MAC address datatype.
As the current macaddr datatype stores only 48 bit MAC address only, and now a days people are adopting to EUI-64 format of MAC address. So it better to add the support in PostgreSQL. Here I attached a POC patch that adds the support for EUI-64 MAC address storage with a new datatype macaddr64. Currently this type takes only EUI-64 datatype, not accepts 48 bit MAC address. Before continuing and adding more details for macaddr64 datatype, it is not possible to add the support for current macaddr datatype as it is a fixed size datatype that is stored in the disk. So any enhancements to change it from 48 to 64 bit will give problems to pg_upgrade. As we are moving to PostgreSQL 10, so are there any plans of backward compatiblity breakage, so the existing macaddr datatype itself can be changed to support both 48 and 64 bit MAC addresses. If not, I will try update the POC patch with more details similar like macaddr datatype.  - https://www.postgresql.org/message-id/20161010162001.1413.12486%40wrigleys.postgresql.org Regards, Hari Babu Fujitsu Australia
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