On 05/12/2015 10:49 PM, Alvaro Herrera wrote:
> If in the future, for instance, we come up with a way to store the ipv4
> plus ipv6 info, we will want to change the page format. If we add a
> page version to the metapage, we can detect the change at pg_upgrade
> time and force a reindex of the index.
A version number in the metapage is a certainly a good idea. But we
already have that, don't we? :
> /* Metapage definitions */
> typedef struct BrinMetaPageData
> {
> uint32 brinMagic;
> uint32 brinVersion;
> BlockNumber pagesPerRange;
> BlockNumber lastRevmapPage;
> } BrinMetaPageData;
>
> #define BRIN_CURRENT_VERSION 1
> #define BRIN_META_MAGIC 0xA8109CFA
Did you have something else in mind?
- Heikki
