I'm trying to determine if a select statement:
1 - causes execution of a Volatile function
- or -
2 - causes execution of a nextval function (same/similar as #1 above?)
from within tcop / postgres.c ??
Things like QueryIsReadOnly imply that select nextval('some_sequence') are
read-only ... which is not read-only in the sense that the database is in a
different state after the nextval runs.
I've been looking through PortalDesc & NodeTag, but haven't been able to find
anything...
suggestions?
If nothing exists, I'd need to create something.
Any suggestions where to start?
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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
