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Doc: improve documentation about composite-value usage.

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Create a section specifically for the syntactic rules around whole-row
variable usage, such as expansion of "foo.*".  This was previously
documented only haphazardly, with some critical info buried in
unexpected places like xfunc-sql-composite-functions.  Per repeated
questions in different mailing lists.

Discussion: <16288.1479610770@sss.pgh.pa.us>
This commit is contained in:
Tom Lane
2016-11-22 17:56:16 -05:00
parent 9a1d0af4ad
commit e1320266ed
4 changed files with 231 additions and 72 deletions
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3
doc/src/sgml/queries.sgml
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@@ -1457,7 +1457,8 @@ SELECT tbl1.a, tbl2.a, tbl1.b FROM ...
<programlisting>
SELECT tbl1.*, tbl2.a FROM ...
</programlisting>
(See also <xref linkend="queries-where">.)
See <xref linkend="rowtypes-usage"> for more about
the <replaceable>table_name</><literal>.*</> notation.
</para>
<para>