Re: gin--a rule for function parameter

1 ginarrayextract() has 2 parameters
2 gin_extract_tsquery() has 3 parameters
3 run sql(from plsql/src/test/regress/sql/opr_sanity.sql), it expect no 
results:
-------------
SELECT p1.amopclaid, p1.amprocnum,p2.oid, p2.proname,p3.opcname,p4.amopclaid, p4.amprocnum,p5.oid,
p5.proname,p6.opcname
FROM pg_amproc AS p1, pg_proc AS p2, pg_opclass AS p3,    pg_amproc AS p4, pg_proc AS p5, pg_opclass AS p6
WHERE p1.amopclaid = p3.oid AND p4.amopclaid = p6.oid AND   p3.opcamid = p6.opcamid AND p1.amprocnum = p4.amprocnum AND
 p1.amproc = p2.oid AND p4.amproc = p5.oid AND   (p2.proretset OR p5.proretset OR p2.pronargs != p5.pronargs);
 
--------------
We can get results as follow:amopclaid | amprocnum | oid  |       proname       |     opcname      | 
amopclaid | amprocnum | oid  |       proname       |     opcname

-----------+-----------+------+---------------------+------------------+-----------+-----------+------+---------------------+------------------
   2771 |         3 | 2743 | ginarrayextract     | _oidvector_ops   | 
 
3659 |         3 | 3657 | gin_extract_tsquery | tsvector_ops     2759 |         3 | 2743 | ginarrayextract     |
_cidr_ops       | 
 
3659 |         3 | 3657 | gin_extract_tsquery | tsvector_ops     2768 |         3 | 2743 | ginarrayextract     |
_name_ops       | 
 
3659 |         3 | 3657 | gin_extract_tsquery | tsvector_ops
......
4 But, reading "plsql/src/test/regress/sql/opr_sanity.sql", there is a 
sentence said:
" We can check that all the referenced instances of the same support routine 
number take the same number of parameters" ?

5 So, ginarrayextract() and gin_extract_tsquery() should take the same 
number of parameters?
Or, " We can check that all the referenced instances of the same support 
routine number take the same number of parameters" is not a right?

6 Actually, pgsql allow all the referenced instances of the same support 
routine number do not take the same number of parameters.

Thanks.
Fly.Li



"Tom Lane" <tgl@sss.pgh.pa.us> д���ʼ�����:<10550.1246457758@sss.pgh.pa.us>...
> "Fly.Li" <fly2nn@126.com> writes:
> > version: PG8.2.2
> > MY Question:
> > Why must "take the same number of parameters" ?
>
> Because the GIN code will call it with a particular number of arguments.
>
> > When I use tsearch2, I found that gin_extract_tsquery() has 3 
> > parameters, it
> > break the rule "take the same number of parameters".
>
> 3 is the correct number of parameters for an extractQuery function
> (before 8.4 anyway), so I'm not clear what you are complaining about.
>
>    regards, tom lane
>
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