Re: Cube extension point support // GSoC'13

On 12.07.2013 14:57, Stas Kelvich wrote:
> Hello.
>
> here is a patch adding to cube extension support for compressed representation of point cubes. If cube is a point,
i.e.has coincident lower left and upper right corners, than only one corner is stored. First bit of the cube header
indicateswhether the cube is point or not. Few moments: 
>
> * Patch preserves binary compatibility with old indices
> * All functions that create cubes from user input, check whether it is a point or not
> * All internal functions that can return cubes takes care of all cases where a cube might become a point

Great!

cube_is_point() needs to still handle old-style points. An NDBOX without
the point-flag set, where the ll and ur coordinates for each dimension
are the same, still needs to be considered a point. Even if you are
careful to never construct such structs in the code, they can be present
on-disk if you have upgraded from an earlier version with pg_upgrade.
Same in cube_out().

> * Added tests for checking correct point behavior

You'll need to adjust all the expected output files, not only cube_1.out.

> Also this patch includes adapted Alexander Korotkov's patch with kNN-based ordering operator, which he wrote for
postgresql-9.0beta1with knngist patch. More info there
http://www.postgresql.org/message-id/AANLkTimhFaq6hCibRnk0tlcQMIyhYWHwAQ2ZD87wbH86@mail.gmail.com

To make review easier, it would be better to keep that as a separate
patch, actually. Could you split it up again, please?

- Heikki