On 1999-12-15, Tom Lane mentioned:
> Next question is, do we want to leave the code as-is, or tighten up
> the parser to reject AS-names and column numbers in GROUP BY?
> It seems to me we should change it, because there are cases where the
> existing code will do the wrong thing according to the SQL spec.
> If "foo" is a column name and also an AS-name for something else,
> "GROUP BY foo" should group on the raw column according to the spec,
> but right now we will pick the SELECT result value instead.
The AS-names are way too convenient to drop them. In the particular
example of ambiguity you could send a notice or a reject it. (What does
ORDER BY foo do in this case? Same problem.)
Perhaps it's really time for the --enable-sql option. :)
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Peter Eisentraut Sernanders väg 10:115
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