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Re: WIP: default values for function parameters

From: "Pavel Stehule" <pavel(dot)stehule(at)gmail(dot)com>
To: "Tom Lane" <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Cc: "Peter Eisentraut" <peter_e(at)gmx(dot)net>, pgsql-hackers(at)postgresql(dot)org
Subject: Re: WIP: default values for function parameters
Date: 2008-11-26 22:14:19
Message-ID: (view raw, whole thread or download thread mbox)
Lists: pgsql-hackers

I am sending actualized versions - I accepted Tom's comments - default
expressions are serialised List stored in text field.

Pavel Stehule

2008/11/25 Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>:
> Peter Eisentraut <peter_e(at)gmx(dot)net> writes:
>> On Monday 24 November 2008 23:21:15 Pavel Stehule wrote:
>>> Default parameters are implemented similar to variadic functions - so
>>> no changes on PL part - all changes are on caller part.
>> Then I don't understand why you need this special data type instead of using
>> an array of text with nulls for parameters without default.
> I'm not even sure you need to store any nulls.  We're going to require
> defaults to be provided for the last N parameters consecutively, right?
> So that's just what the array contents are.  Or maybe it's not an array
> at all but a single text item containing the representation of a List
> --- compare the storage of index expressions.  There shouldn't be any
> need to read the contents of the value during function resolution;
> an appropriate representation will have the number of non-defaultable
> parameters stored as a separate integer column.

>                        regards, tom lane

Attachment: defaults.diff.gz
Description: application/x-gzip (95.2 KB)

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