Make psql_crosstab plans more stable

Alvaro Herrera <alvherre@alvh.no-ip.org>

Commit: c588df9971f41210d2fad8bf0112a78458de96cb
Author: Alvaro Herrera <alvherre@alvh.no-ip.org>
Date: 2016-06-07T23:18:31Z
Releases: 9.6.0
Make psql_crosstab plans more stable

To achieve this, ANALYZE the data table before querying it, as suggested
by Tom Lane.  On my system, this enables the test to pass with 128 kB of
work_mem (a value with which other tests fail -- so it seems good
enough).

Reported by Michaël Paquier.

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