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Fix up text concatenation so that it accepts all the reasonable cases that

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were accepted by prior Postgres releases.  This takes care of the loose end
left by the preceding patch to downgrade implicit casts-to-text.  To avoid
breaking desirable behavior for array concatenation, introduce a new
polymorphic pseudo-type "anynonarray" --- the added concatenation operators
are actually text || anynonarray and anynonarray || text.
This commit is contained in:
Tom Lane
2007-06-06 23:00:50 +00:00
parent 7dab4f75ca
commit 2d4db3675f
22 changed files with 301 additions and 109 deletions
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8
doc/src/sgml/plpgsql.sgml
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@@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.109 2007/04/29 01:21:08 neilc Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/plpgsql.sgml,v 1.110 2007/06/06 23:00:36 tgl Exp $ -->
<chapter id="plpgsql">
<title><application>PL/pgSQL</application> - <acronym>SQL</acronym> Procedural Language</title>
@@ -210,8 +210,8 @@ $$ LANGUAGE plpgsql;
<para>
<application>PL/pgSQL</> functions can also be declared to accept
and return the polymorphic types
<type>anyelement</type>, <type>anyarray</type>, and <type>anyenum</>.
The actual
<type>anyelement</type>, <type>anyarray</type>, <type>anynonarray</type>,
and <type>anyenum</>. The actual
data types handled by a polymorphic function can vary from call to
call, as discussed in <xref linkend="extend-types-polymorphic">.
An example is shown in <xref linkend="plpgsql-declaration-aliases">.
@@ -700,7 +700,7 @@ $$ LANGUAGE plpgsql;
<para>
When the return type of a <application>PL/pgSQL</application>
function is declared as a polymorphic type (<type>anyelement</type>,
<type>anyarray</type>, or <type>anyenum</>),
<type>anyarray</type>, <type>anynonarray</type>, or <type>anyenum</>),
a special parameter <literal>$0</literal>
is created. Its data type is the actual return type of the function,
as deduced from the actual input types (see <xref