| From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
|---|---|
| To: | Martijn van Oosterhout <kleptog(at)svana(dot)org> |
| Cc: | Gregory Stark <stark(at)enterprisedb(dot)com>, Simon Riggs <simon(at)2ndquadrant(dot)com>, Bruce Momjian <bruce(at)momjian(dot)us>, pgsql-hackers(at)postgresql(dot)org |
| Subject: | Re: Index AM change proposals, redux |
| Date: | 2008-04-24 16:34:38 |
| Message-ID: | 377.1209054878@sss.pgh.pa.us |
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| Lists: | pgsql-hackers |
Martijn van Oosterhout <kleptog(at)svana(dot)org> writes:
> Well, for these two:
> * For Highly Non-Unique Data we can use Duplicate Compression
> * Multi-Column Leading Value Compression - if you have a multi-column
> You don't need any new logic at all. If _bt_compare says they're equal
> you can compact them.
Not if you'd like to support index key retrieval. (The equality
function that btree is using doesn't necessarily mean "equal for all
purposes".)
regards, tom lane
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