Re: Re: UNION JOIN vs UNION SELECT

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От Chris
Тема Re: Re: UNION JOIN vs UNION SELECT
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Msg-id 39AB0AAF.C675F7C7@nimrod.itg.telecom.com.au
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Ответ на UNION JOIN vs UNION SELECT  (Tom Lane <tgl@sss.pgh.pa.us>)
Ответы Re: Re: UNION JOIN vs UNION SELECT  (Andrew Selle <aselle@upl.cs.wisc.edu>)
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Tom Lane wrote:
> 
> Chris <chrisb@nimrod.itg.telstra.com.au> writes:
> >> the grammar is just plain not LR(1) unless you
> >> count UNION JOIN as a single token.
> 
> > Would it be bad to make UNION JOIN as a single token?
> 
> That's exactly the solution I'm proposing.  However, it's pretty painful
> to make the lexer do it directly (consider intervening comments, for
> example)

Comments are a pain in the parser. What if something prior to the lexer
filtered out comments before either the lexer or parser could see them?
Would it be as easy as s/--.*// before the lexer?


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