Excerpts from Robert Haas's message of vie may 20 18:41:37 -0400 2011:

> This means that, in a situation where aren't using DML, and are
> running very simple queries without prepared statements, the parser
> bloat resulting from supporting all the other kinds of queries which
> aren't being exercised by the tests results in a slowdown of
> approximately 0.7%.

So the point here is, we do not need to worry about adding new keywords,
because the performance impact is really minimal.  Right?

-- 
Álvaro Herrera <alvhe...@commandprompt.com>
The PostgreSQL Company - Command Prompt, Inc.
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