Re: new module contrib/tree for 7.2 ?

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(at)sai(dot)msu(dot)su, http://www.sai.msu.su/~megera/
> phone: +007(095)939-16-83, +007(095)939-23-83
>
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