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	Thu, 25 Sep 2003 07:04:07 PDT
Date: Thu, 25 Sep 2003 07:04:07 -0700 (PDT)
From: "George A.J" <jinujosein@yahoo.com>
Subject: Re: Case Insensitive comparison 
To: pgsql-sql@postgresql.org
In-Reply-To: <2176.1064469002@sss.pgh.pa.us>
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Thanks to all of you for your valuable suggesstions....
does postgresql internally uses the = operator(text,text) for any other purposes.
i think that overloading it solves the index problem too...
 
 

Tom Lane <tgl@sss.pgh.pa.us> wrote:
Josh Berkus writes:
>> How can i create a function that accept and return any type. the type "any"
>> is not allowing as parameter or return type. Is it possible? i want to
>> create a function similar to NULLIF().

> You can't, nor will you be able to -- in te future, some 7.4 functions will be 
> able to *accept* any type, but they will still return a specific type.

Au contraire. The 7.4 polymorphic-function features may well solve
jinujose's problem, if he can indeed write a type-independent function
body. For example

create function nullif(anyelement, anyelement) returns anyelement as
'select case when $1 = $2 then null else $1 end' language sql;

I'm not sure we're all the way there yet, cf
http://archives.postgresql.org/pgsql-general/2003-09/msg00500.php

regards, tom lane

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<DIV><BR>Thanks to all of you for your valuable suggesstions....</DIV>
<DIV>does postgresql internally uses the = operator(text,text) for any other purposes.</DIV>
<DIV>i think that overloading it solves the index problem too...</DIV>
<DIV>&nbsp;</DIV>
<DIV>&nbsp;</DIV>
<DIV><BR><B><I>Tom Lane &lt;tgl@sss.pgh.pa.us&gt;</I></B> wrote:</DIV>
<BLOCKQUOTE class=replbq style="BORDER-LEFT: #1010ff 2px solid; MARGIN-LEFT: 5px; PADDING-LEFT: 5px">Josh Berkus <JOSH@AGLIODBS.COM>writes:<BR>&gt;&gt; How can i create a function that accept and return any type. the type "any"<BR>&gt;&gt; is not allowing as parameter or return type. Is it possible? i want to<BR>&gt;&gt; create a function similar to NULLIF().<BR><BR>&gt; You can't, nor will you be able to -- in te future, some 7.4 functions will be <BR>&gt; able to *accept* any type, but they will still return a specific type.<BR><BR>Au contraire. The 7.4 polymorphic-function features may well solve<BR>jinujose's problem, if he can indeed write a type-independent function<BR>body. For example<BR><BR>create function nullif(anyelement, anyelement) returns anyelement as<BR>'select case when $1 = $2 then null else $1 end' language sql;<BR><BR>I'm not sure we're all the way there yet, cf<BR>http://archives.postgresql.org/pgsql-general/2003-09/msg00500.php<BR><BR>regards, tom
 lane<BR><BR>---------------------------(end of broadcast)---------------------------<BR>TIP 4: Don't 'kill -9' the postmaster</BLOCKQUOTE><p><hr SIZE=1>
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