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Doc: in v12 release notes, explain how to replace uses of consrc and adsrc.

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While you can find that info if you drill down far enough, it seems more
helpful to put something right in the compatibility notes.  Per a question
from Ivan Sergio Borgonovo.

Discussion: https://postgr.es/m/a6359855-2a5e-a56c-ebba-4ea46a1f0ebe@webthatworks.it
This commit is contained in:
Tom Lane 2019-11-15 12:31:53 -05:00
parent 5a6eea0926
commit d61e7f174d
1 changed files with 18 additions and 0 deletions
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doc/src/sgml/release-12.sgml
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@ -1590,6 +1590,16 @@ Author: Peter Eisentraut <peter_e@gmx.net>
linkend="catalog-pg-constraint"><structname>pg_constraint</structname></link>.<structfield>consrc</structfield>
column (Peter Eisentraut)
</para>
<para>
This column has been deprecated for a long time, because it did not
update in response to other catalog changes (such as column renamings).
The recommended way to get a text version of a check constraint's
expression from <structname>pg_constraint</structname>
is <literal>pg_get_expr(conbin, conrelid)</literal>.
<function>pg_get_constraintdef()</function> is also a useful
alternative.
</para>
</listitem>
<listitem>
@ -1603,6 +1613,14 @@ Author: Peter Eisentraut <peter_e@gmx.net>
linkend="catalog-pg-attrdef"><structname>pg_attrdef</structname></link>.<structfield>adsrc</structfield>
column (Peter Eisentraut)
</para>
<para>
This column has been deprecated for a long time, because it did not
update in response to other catalog changes (such as column renamings).
The recommended way to get a text version of a default-value expression
from <structname>pg_attrdef</structname> is <literal>pg_get_expr(adbin,
adrelid)</literal>.
</para>
</listitem>
<listitem>