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
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