<[EMAIL PROTECTED]> writes:
> - How can I introduce a new variable (e.g., XXX) to the system so that
> for example SET XXX=1 will work?
The basic thing is to add an appropriate table entry to guc.c. You
might try searching the sources for all references to one of the
lesser-used GUC variables, perhaps default_statistics_target, to get
a feeling for what's involved.
regards, tom lane
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TIP 9: the planner will ignore your desire to choose an index scan if your
joining column's datatypes do not match
