Re: [HACKERS] index suggestion for 7.4

2003-05-31 Thread Tom Lane
Bruno Wolff III <[EMAIL PROTECTED]> writes: > I went back and reread the stuff on NEGATOR and found it only applies > to operators that return boolean types. I had thought it was different > and would let you make the deduction a > b <=> -a <= -b, but that isn't > the case. Instead it lets you make

Re: [HACKERS] index suggestion for 7.4

2003-05-31 Thread Bruno Wolff III
On Fri, May 30, 2003 at 11:31:23 -0700, Stephan Szabo <[EMAIL PROTECTED]> wrote: > On Fri, 30 May 2003, Bruno Wolff III wrote: > > > I was hoping the new stuff Tom added would make doing this easier. The issue > > has come up before and at least at that time it didn't get changed so I > > expect

Re: [HACKERS] index suggestion for 7.4

2003-05-31 Thread Stephan Szabo
On Fri, 30 May 2003, Bruno Wolff III wrote: > On Fri, May 30, 2003 at 10:42:24 -0700, > Stephan Szabo <[EMAIL PROTECTED]> wrote: > > On Fri, 30 May 2003, Bruno Wolff III wrote: > > > > > Now that expressions can be used in indexes in 7.4 you can have multicolumn > > > indexes that are ordered in

Re: [HACKERS] index suggestion for 7.4

2003-05-31 Thread Bruno Wolff III
On Fri, May 30, 2003 at 10:42:24 -0700, Stephan Szabo <[EMAIL PROTECTED]> wrote: > On Fri, 30 May 2003, Bruno Wolff III wrote: > > > Now that expressions can be used in indexes in 7.4 you can have multicolumn > > indexes that are ordered in different directions. However the planner > > doesn't s

Re: [HACKERS] index suggestion for 7.4

2003-05-31 Thread Stephan Szabo
On Fri, 30 May 2003, Bruno Wolff III wrote: > Now that expressions can be used in indexes in 7.4 you can have multicolumn > indexes that are ordered in different directions. However the planner > doesn't seem to understand that order by -col asc is the same as order by > col desc (for at least the

Re: [HACKERS] index suggestion for 7.4

2003-05-31 Thread Tom Lane
Bruno Wolff III <[EMAIL PROTECTED]> writes: > Now that expressions can be used in indexes in 7.4 you can have multicolumn > indexes that are ordered in different directions. However the planner > doesn't seem to understand that order by -col asc is the same as order by > col desc (for at least the