ITAGAKI Takahiro <[EMAIL PROTECTED]> writes:
> I tested your patch with VACUUM FREEZE. The performance was improved when
> I set scan_recycle_buffers > 32. I used VACUUM FREEZE to increase WAL traffic,
> but this patch should be useful for normal VACUUMs with backgrond jobs!
Proving that you can see a different in a worst-case scenario is not the
same as proving that the patch is useful in normal cases.
regards, tom lane
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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
