Add skip-empty-xacts option to test_decoding for use in the regression tests.

Andres Freund <andres@anarazel.de>

Commit: cb3d2df90e240680438cb612edcd1598579f4d5c
Author: Andres Freund <andres@anarazel.de>
Date: 2014-09-01T14:08:57Z
Releases: 9.4.0
Add skip-empty-xacts option to test_decoding for use in the regression tests.

The regression tests for contrib/test_decoding regularly failed on
postgres instances that were very slow. Either because the hardware
itself was slow or because very expensive debugging options like
CLOBBER_CACHE_ALWAYS were used.

The reason they failed was just that some additional transactions were
decoded. Analyze and vacuum, triggered by autovac.

To fix just add a option to test_decoding to only display transactions
in which a change was actually displayed. That's not pretty because it
removes information from the tests; but better than constantly failing
tests in very likely harmless ways.

Backpatch to 9.4 where logical decoding was introduced.

Discussion: 20140629142511.GA26930@awork2.anarazel.de

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