On 2013-10-26 11:27:19 -0400, Tom Lane wrote:
> Andres Freund <and...@2ndquadrant.com> writes:
> > [ patch for \a\t mode in rules and sanity_check output ]
> Committed with some minor adjustment of the comments.
> >> +1 (but what are those silly parens in pg_seclabels definition?),
> > That's because it contain several UNION ALLs and ruleutils makes sure
> > the order is correct.
> That looks weird to me too, but it's surely not the fault of this patch.
> Maybe we should take a look at exactly what ruleutils is doing there.
Imo what it does looks sane - it adds parentheses whenever a child of a
set operation is a set operation again to make sure the order in which
the generated set operations are parsed/interpreted stays the same.
Now, we could probably remove that in some more cases (left is SetOp but
doesn't have an ORDER BY/LIMIT/...), but it's hard enough to figure out
when that's safe that I wouldn't bother.
Andres Freund http://www.2ndQuadrant.com/
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