Re: WIP: hooking parser

Next sample of parser hook using:

attachment contains module that transform every empty string to null.
I am not sure, if this behave is exactly compatible with Oracle, but
for first iteration it is good.

postgres=# select length('') is null;
?column?
----------
t
(1 row)

I thing, so this should be used for emulation of some constructors too.

Regards
Pavel Stehule

2009/2/13 Peter Eisentraut <peter_e(at)gmx(dot)net>:
> Heikki Linnakangas wrote:
>>
>> And on top of that, decode() is supposed to do short-circuit evaluation of
>> the arguments.
>
> Then the only solution is to hack it right into the parser.
>
> There is an existing decode() function however ...
>