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the order of operator computation - Mailing list pgsql-sql

From Jian He
Subject the order of operator computation
Date
Msg-id CAMV54g3uW+jQkVnOaSQOU9fVsYjmz1XF8v-bzRZyPvsJLSuNOw@mail.gmail.com
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Responses Re: the order of operator computation
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In other language:
(+) 1 1  

will return 2.

In postgresql seems like the order is fixed. 
LEFTARG Operator RIGHTARG

Is there some way to achieve:
 Operator LEFTARG RIGHTARG 


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