Peter Geoghegan <[email protected]> writes:
> On Mon, Apr 21, 2014 at 5:50 PM, Tom Lane <[email protected]> wrote:
>> ARC *was* the predecessor algorithm. See commit 5d5087363.
> I believe that the main impetus for replacing ARC with clock sweep
> came from patent issues, though.
That was one issue, but performance gains were a large part of it too,
and the main reason why we picked clock sweep rather than something else.
Did you read the commit message I pointed to?
(See also 4e8af8d27.)
regards, tom lane
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