[Monetdb-developers] about Using Mal

Niels Nes Niels.Nes at cwi.nl
Wed Aug 18 10:08:59 CEST 2010


On Wed, Aug 18, 2010 at 04:04:37PM +0800, kun ren wrote:
> Yes, when I run successfully! But why I must running sql.init() and
> then can run mal code?
> Best regards!

The sql.init() initializes the sql catalog. The code coming from explain
assumes these are there. 

Niels
> 
> 2010/8/18 Niels Nes <Niels.Nes at cwi.nl>
> 
>     On Wed, Aug 18, 2010 at 03:53:49PM +0800, kun ren wrote:
>     > Thanks !
>     > But when I use mclient -lmsql, but it has a error, the error is
>     > :language option needs to be one of sql, mil, mal, or xquery?
> 
>     sql (and msql) start the interpreter with a 'sql' context.
>     You can create this by running sql.init();
> 
>     After that the mal code should run.
> 
>     Niels
>     >
>     > Best regards!
>     >
>     > 2010/8/18 Fabian Groffen <Fabian.Groffen at cwi.nl>
>     >
>     >     On 18-08-2010 15:21:30 +0800, kun ren wrote:
>     >     > Yes,I know expain. I mean I use MAL interface, write MAL
>     >     instrction to
>     >     > implement it. I write the mal instrctions generated by the
>     expain
>     >     select *
>     >     > from t1,but it has errors.so I ask what mal when I use MAL
>     >     interface ,not
>     >     > sql interface.
>     >
>     >     use mclient -lmsql, that should do the trick.
>     >
>     >    
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>     Niels Nes, Centrum Wiskunde & Informatica (CWI)
>     Science Park 123, 1098 XG Amsterdam, The Netherlands
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-- 
Niels Nes, Centrum Wiskunde & Informatica (CWI)
Science Park 123, 1098 XG Amsterdam, The Netherlands
room L3.14,  phone ++31 20 592-4098 	sip:4098 at sip.cwi.nl
url: http://www.cwi.nl/~niels   e-mail: Niels.Nes at cwi.nl




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