"Donald Fraser" <[EMAIL PROTECTED]> writes:
> Is the returned value of a function defined as IMMUTABLE cached =
> globally?
No, in fact it isn't cached at all. IMMUTABLE tells the planner that
it's OK to fold a function call with constant inputs to a constant
result value at plan time. Nothing more.
regards, tom lane
---------------------------(end of broadcast)---------------------------
TIP 9: In versions below 8.0, the planner will ignore your desire to
choose an index scan if your joining column's datatypes do not
match
