Csaba Nagy wrote:
> On Mon, 2007-10-08 at 09:40 +0100, Heikki Linnakangas wrote:
>> This idea has been discussed to death many times before. Please search
>> the archives.
> Somewhat related to the "visibility in index" thing: would it be
> possible to have a kind of index-table ? We do have here some tables
> which have 2-4 fields, and the combination of them forms the primary key
> of the table. There are usually no other indexes on the table, and the
> net result is that the PK index duplicates the heap. So it would be cool
> if the index would be THE heap somehow...

The clustered index patch I worked on for 8.3, but didn't make it in,
would have helped that use case a lot.

A column-store kind of mechanism would be nice. Some columns could be
stored in index-like structures, while other would be in the heap. I
haven't seen any practical proposal on how to do it though.

  Heikki Linnakangas
  EnterpriseDB   http://www.enterprisedb.com

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TIP 9: In versions below 8.0, the planner will ignore your desire to
       choose an index scan if your joining column's datatypes do not

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