On Fri, Dec 19, 2014 at 05:32:43PM -0800, Peter Geoghegan wrote: > > Most people would list the columns, but if there is a really bizarre > > constraint, with non-default opclasses, or an exclusion constraint, it's > > probably been given a name that you could use. > > What I find curious about the opclass thing is: when do you ever have > an opclass that has a different idea of equality than the default > opclass for the type? In other words, when is B-Tree strategy number 3 > not actually '=' in practice, for *any* B-Tree opclass? Certainly, it > doesn't appear to be the case that it isn't so with any shipped > opclasses - the shipped non-default B-Tree opclasses only serve to > provide alternative notions of sort order, and never "equals".
Well, in theory you could build a case insensetive index on a text column. You could argue that the column should have been defined as citext in the first place, but it might not for various reasons. Have a nice day, -- Martijn van Oosterhout <klep...@svana.org> http://svana.org/kleptog/ > He who writes carelessly confesses thereby at the very outset that he does > not attach much importance to his own thoughts. -- Arthur Schopenhauer
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