Here is a patch to fix a bug in handling default values in reloptions.
This fix should be applied to HEAD and 8.4.0.
I used 'magic number -1' to propagate "not-specified" information to
autovacuum process. It might look strange because the default value is
out of range of the reloption, but I think it has less impact to the
codes comapred with other solutions (dynamic default values etc.).
> To fix the bug, each field in StdRdOptions should have "not-specified" flag.
> If not specified, autovacuum should use current GUC settings instead of
> reloptions. Is it possible to change the default values of reloptions
> to some magic number (-1 or so) ?
Regards,
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ITAGAKI Takahiro
NTT Open Source Software Center