On Thu, Feb 22, 2018 at 12:35 AM, Tom Lane <t...@sss.pgh.pa.us> wrote:
> Robert Haas <rh...@postgresql.org> writes:
>> Charge cpu_tuple_cost * 0.5 for Append and MergeAppend nodes.
> This seems to have produced some plan instability in the buildfarm.

I was worried about that.  Looking at it now.  I wish we had some way
to figure out whether a given plan was likely to be unstable on the
buildfarm other than committing it and seeing what happens.  It's
surprisingly difficult to write non-trivial tests that produce
consistent EXPLAIN output, and annoyingly time-consuming to try to
figure out why they don't.

Robert Haas
EnterpriseDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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