From: | Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us> |
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To: | Ian Lance Taylor <ian(at)airs(dot)com> |
Cc: | Peter Eisentraut <peter_e(at)gmx(dot)net>, PostgreSQL Development <pgsql-hackers(at)postgresql(dot)org> |
Subject: | Re: Re: [PATCHES] Select parser at runtime |
Date: | 2001-08-12 00:24:06 |
Message-ID: | 17301.997575846@sss.pgh.pa.us |
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Lists: | pgsql-hackers pgsql-patches |
Ian Lance Taylor <ian(at)airs(dot)com> writes:
> For example: the datatypes have different names; the set of reserved
> words is different; Oracle uses a weird syntax for outer joins.
Is it really possible to fix these things strictly in the parser
(ie, without any semantic analysis)? For example, I don't quite see
how you're going to translate Oracle-style outer joins to SQL standard
style without figuring out which fields belong to which relations.
Keep in mind the cardinal rule for the parsing step: Thou Shalt Not
Do Any Database Access (because the parser must work even in
transaction-aborted state, else how do we recognize ROLLBACK command?)
regards, tom lane
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