Re: [HACKERS] Regarding B-Tree Lookup
| От | Craig Ringer |
|---|---|
| Тема | Re: [HACKERS] Regarding B-Tree Lookup |
| Дата | |
| Msg-id | CAMsr+YF9e78Jr_H9+Ft2-0yiP6AM6LXum+sd4e06Sz+=XsOjRQ@mail.gmail.com обсуждение исходный текст |
| Ответ на | Re: [HACKERS] Regarding B-Tree Lookup (Michael Paquier <michael.paquier@gmail.com>) |
| Список | pgsql-hackers |
On 2 May 2017 7:34 pm, "Michael Paquier" <michael.paquier@gmail.com> wrote:
On Tue, May 2, 2017 at 6:12 PM, Mahi Gurram <teckymahi@gmail.com> wrote:
> I'm building some custom extension on top of postgres 9.6.1. As part of
> that, I would like to read Heap Tuple directly from my extension using
> Primary Key.
>
> By default, postgres table index(B-Tree) its PrimaryKey(PK). So, i would
> like to get TID by doing a lookup into PK's B-Tree index. Using which i
> could read HeapTuple directly.
Use the heapam and indexam.
There's a handy wrapper for simpler queries in genam. See systable_beginscsn etc. AFAIK these aren't really restricted to system tables.
>Why don't you just use SPI within your extension? No need to copy the
> Please suggest me the easiest way to lookup into PK's B-Tree index for
> getting TIDs.
logic for btree lookups this way.
https://www.postgresql.org/docs/9.6/static/spi.html
SPI is certainly the simplest way.
> Suggesting a postgres extensions which does B-Tree lookup will also helps
> me.
Pglogical has lots of direct heap and index access via genam.
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