On Tue, Aug 23, 2016 at 8:43 PM, Tom Lane <t...@sss.pgh.pa.us> wrote:

> It's interesting that nobody has complained about this behavior.

We have been known to emphasize that unless you have an ORDER BY
clause at the outermost level of a query, there is no guarantee
about the order of rows returned.  In general, even with autovacuum
off and no DML running, the same query can return rows in a
different order because of synchronized scans -- so I would tend to
view the lack of complaints as a sign of the maturity and awareness
of the user base.

Of course, it can still be an inconvenience for testing, but that's
a different issue.

Kevin Grittner
EDB: http://www.enterprisedb.com
The Enterprise PostgreSQL Company

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