On Sat, Oct 02, 2004 at 10:43:01 +0200,
Gaetano Mendola <[EMAIL PROTECTED]> wrote:
> Tom Lane wrote:
> >I wrote:
> >Do you see any other mislabelings?
>
> I don't but I think that the concept of immutable shall be expanded.
> I mean I can use safely a date_trunc immutable in a query ( I think this
> is a sort of "immutable per statement" ) but not in a index definition
> ( the index mantainance is affected by the current timezonesettings ).
> So may be another modifier shall be introduced that reflect the "immutable
> per statement"
There has been such a distinction for a major release or two. "Stable"
is how you mark a function that will return the same value within a
single transaction.
---------------------------(end of broadcast)---------------------------
TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
