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Add a compatibility note about plpgsql's treatment of SELECT INTO rec.fld

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when fld is of composite type.  Per discussion of bug #5644 from Valentine
Gogichashvili.
This commit is contained in:
Tom Lane 2010-09-15 17:45:57 +00:00
parent 79b54816db
commit e1089e34eb
1 changed files with 26 additions and 1 deletions
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27
doc/src/sgml/release-9.0.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.55 2010/09/01 15:14:42 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/release-9.0.sgml,v 2.56 2010/09/15 17:45:57 tgl Exp $ -->
<sect1 id="release-9-0">
<title>Release 9.0</title>
@ -434,6 +434,31 @@
</para>
</listitem>
<listitem>
<para>
PL/pgSQL now treats selection into composite fields more consistently
(Tom Lane)
</para>
<para>
Formerly, a statement like
<literal>SELECT ... INTO <replaceable>rec</>.<replaceable>fld</> FROM ...</literal>
was treated as a scalar assignment even if the record field
<replaceable>fld</> was of composite type. Now it is treated as a
record assignment, the same as when the <literal>INTO</> target is a
regular variable of composite type. So the values to be assigned to the
field's subfields should be written as separate columns of the
<command>SELECT</> list, not as a <literal>ROW(...)</> construct as in
previous versions.
</para>
<para>
If you need to do this in a way that will work in both 9.0 and previous
releases, you can write something like
<literal><replaceable>rec</>.<replaceable>fld</> := ROW(...) FROM ...</literal>.
</para>
</listitem>
<listitem>
<para>
Remove PL/pgSQL's <literal>RENAME</> declaration (Tom Lane)