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From: Joe Conway <[email protected]>
To: Bruce Momjian <[email protected]>
Cc: Tatsuo Ishii <[email protected]>
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: [email protected]
Cc: PostgreSQL-documentation <[email protected]>
Subject: Re: Annotated release notes
Date: Thu, 30 Oct 2003 21:54:10 -0800
Message-ID: <[email protected]> (raw)
In-Reply-To: <[email protected]>
References: <[email protected]>

Bruce Momjian wrote:
> 	http://candle.pha.pa.us/main/writings/pgsql/sgml/release.html#RELEASE-7-4
> 
> I need people to check this and help me with the items marked 'bjm'.  I
> am confused about the proper text for those sections.

 > Allow polymorphic SQL functions (Joe)
 > bjm ??

What isn't clear about this? Should/can we refer to related sections of 
the manual?
http://developer.postgresql.org/docs/postgres/xfunc-sql.html#AEN28722
http://developer.postgresql.org/docs/postgres/extend-type-system.html#EXTEND-TYPES-POLYMORPHIC

 > Allow user defined aggregates to use polymorphic functions (Joe)
 > bjm ??

Same question. From this url:
http://developer.postgresql.org/docs/postgres/xaggr.html
see this paragraph:

  Aggregate functions may use polymorphic state transition functions or 
final functions, so that the same functions can be used to implement 
multiple aggregates. See Section 33.2.1  for an explanation of 
polymorphic functions. Going a step further, the aggregate function 
itself may be specified with a polymorphic base type and state type, 
allowing a single aggregate definition to serve for multiple input data 
types. Here is an example of a polymorphic aggregate:

CREATE AGGREGATE array_accum (
     sfunc = array_append,
     basetype = anyelement,
     stype = anyarray,
     initcond = '{}'
);

Joe

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