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Teodor Sigaev wrote:
> http://www.sigaev.ru/misc/indexnulls-0.8.gz
>
> Initially patch was developed by Martijn van Oosterhout. But it's reworked and
> support of searching NULLS to GiST too. Patch adds new column named amsearchnull
> to pg_am. To recognize IS NULL clause ScanKey->sk_flags contains (SK_ISNULL &
> SK_INDEXFINDNULL) and ScanKey->sk_strategy sets to InvalidStrategy. IS NOT NULL
> isn't supported.
>
> The patch was already suggested to community
> (http://archives.postgresql.org/pgsql-patches/2006-12/msg00019.php
> and http://archives.postgresql.org/pgsql-hackers/2007-02/msg01162.php), but the
> single objection was:
> http://archives.postgresql.org/pgsql-patches/2006-12/msg00028.php
>
> Objection was about representing IS [NOT] NULL clause in SkanKey structure,
> because it required to set strategy to BTEqualStrategyNumber, and Tom doubted
> about needing of such support.
>
> Now ScanKey->sk_strategy = InvalidStrategy and btree code transforms it to
> BTEqualStrategyNumber in _bt_preprocess_keys(), btcostestimate knows that fact too.
>
> GiST doesn't need to transform strategy - it looks at SK_INDEXFINDNULL only.
>
> --
> Teodor Sigaev E-mail: teodor@sigaev.ru
> WWW: http://www.sigaev.ru/
>
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--
Bruce Momjian <bruce@momjian.us> http://momjian.us
EnterpriseDB http://www.enterprisedb.com
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