On Wed, May 23, 2012 at 2:05 PM, Tom Lane wrote:
> Robert Haas writes:
>> Since we haven't actually released spgist yet, I'm wondering if it
>> should be revised to look more like btree and hash - that is, add a
>> 32-bit version number immediately following the magic number. All
>> experience h
Robert Haas writes:
> Since we haven't actually released spgist yet, I'm wondering if it
> should be revised to look more like btree and hash - that is, add a
> 32-bit version number immediately following the magic number. All
> experience hath shown that it is often much more work to add such
>
A quick survey of our various index AMs reveals that:
1. btree and hash indexes have a metapage that begins with a 32-bit
magic number, followed by a 32-bit version number.
2. spgist has a metapage with a version number, but no magic number.
3. gin has a metapage with a version number that is not
