pgsql: Doc: explicitly point out that enum values can't be dropped.

From: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
To: pgsql-committers(at)postgresql(dot)org
Subject: pgsql: Doc: explicitly point out that enum values can't be dropped.
Date: 2018-03-16 17:44:54
Message-ID: E1ewtPS-0004Cw-Of@gemulon.postgresql.org
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Doc: explicitly point out that enum values can't be dropped.

This was not stated in so many words anywhere. Document it to make
clear that it's a design limitation and not just an oversight or
documentation omission.

Discussion: https://postgr.es/m/152089733343.1222.6927268289645380498@wrigleys.postgresql.org

Branch
------
REL_10_STABLE

Details
-------
https://git.postgresql.org/pg/commitdiff/b7fbd3f4838631f7279704638caa74b974f22371

Modified Files
--------------
doc/src/sgml/datatype.sgml | 20 ++++++++++++++------
1 file changed, 14 insertions(+), 6 deletions(-)

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