Re: strange type name in information_schema - Mailing list pgsql-general

2011/5/21 Dan S <strd911@gmail.com>:

> So is there always an underscore prepended to the type name of an array ?
> for example float[] would then be _float right ?

usually yes - this is older method for marking some type as array. Now
array types are described by typelem in pg_type table.

Pavel

>
> Best Regards
> Dan S
>
> 2011/5/21 Pavel Stehule <pavel.stehule@gmail.com>
>>
>> Hello
>>
>> type "array of text" has name "_text"
>>
>> Regards
>>
>> Pavel Stehule
>>
>> 2011/5/21 Dan S <strd911@gmail.com>:
>> > Hi !
>> >
>> > I'm running "PostgreSQL 9.0.2, compiled by Visual C++ build 1500,
>> > 32-bit".
>> >
>> > I'm trying to get type information on functions out of
>> > information_schema.
>> > When there is an array as input or output of a function I try to query
>> > information_schema of the array type.
>> >
>> > In this case udt_name gives the type name _text why does it not give
>> > text ?
>> >
>> > Is this the right way to query the parameter types ?
>> >
>> > CREATE OR REPLACE FUNCTION test(ta text[]) RETURNS void AS $$
>> > BEGIN
>> > RETURN;
>> > END;
>> > $$ LANGUAGE plpgsql;
>> >
>> > select p.udt_name,p.data_type,*
>> > from information_schema.routines r ,information_schema.parameters p
>> > where r.routine_name = 'test'
>> > and p.specific_name = r.specific_name
>> > and p.specific_catalog=r.specific_catalog
>> > and p.specific_schema=r.specific_schema
>> >
>> >
>> > Best Regards
>> > Dan S
>> >
>
>