Re: new module contrib/tree for 7.2 ? - Mailing list pgsql-hackers

Oleg, can you send over a patch?

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Oleg Bartunov wrote:
> Hi,
> 
> Is't late to submit new contrib module for 7.2 ?
> It's almost ready and tested, we have to write README.tree.
> 
> New module creates new data types 'tree', 'treequery' for tree-like data and
> provides indexed access methods using Btree or GiST.
> Node represents as a path to the root, so record like '3.4' means
> 4-th child of 3-rd child of the root node.
> Due-to bit-representation there is a limitation to the number of
> children - 64 and defined in compile time (valid values - 8,16,32,64).
> For practical purposes 64 children looks quite enough.
> insert,delete operations should be ok, while move operations
> is a pain - one should update all paths of children nodes.
> But search is very fast, we use data from Open Directory catalog (www.dmoz.org)
> for testing:
> 
> Select all countries:
> 
> dmoz64=# explain analyze select * from dmoz where tid <* '18.*.0';
> NOTICE:  QUERY PLAN:
> 
> Index Scan using tid_g_idx on dmoz  (cost=0.00..1094.10 rows=277 width=100) (actual time=3.54..23.76 rows=56
loops=1)
> Total runtime: 23.96 msec
> 
> EXPLAIN
> dmoz64=#
> 
>        name         |             strid             |   id   |  tid
> ---------------------+-------------------------------+--------+-------
>  Tagalog             | Top/World/Tagalog             | 276537 | 18.18
>  Taiwanese           | Top/World/Taiwanese           | 276566 | 18.19
>  Tamil               | Top/World/Tamil               | 276567 | 18.20
>  Telugu              | Top/World/Telugu              | 276568 | 18.21
>  Thai                | Top/World/Thai                | 276601 | 18.22
>  Ukrainian           | Top/World/Ukrainian           | 276602 | 18.23
>  Vietnamese          | Top/World/Vietnamese          | 276603 | 18.24
>  Japanese            | Top/World/Japanese            | 268629 | 18.31
>  Kiswahili           | Top/World/Kiswahili           | 268630 | 18.32
>  Afrikaans           | Top/World/Afrikaans           | 256813 | 18.1
>  Italiano            | Top/World/Italiano            | 266163 | 18.30
>  Interlingua         | Top/World/Interlingua         | 266144 | 18.29
>  Indonesia           | Top/World/Indonesia           | 265859 | 18.28
>  Croatian            | Top/World/Croatian            | 257063 | 18.12
> ....................................................................
> 
> 
> 
>     Regards,
>         Oleg
> _____________________________________________________________
> Oleg Bartunov, sci.researcher, hostmaster of AstroNet,
> Sternberg Astronomical Institute, Moscow University (Russia)
> Internet: oleg@sai.msu.su, http://www.sai.msu.su/~megera/
> phone: +007(095)939-16-83, +007(095)939-23-83
> 
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