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Implement the basic form of UNNEST, ie unnest(anyarray) returns setof

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anyelement.  This lacks the WITH ORDINALITY option, as well as the multiple
input arrays option added in the most recent SQL specs.  But it's still a
pretty useful subset of the spec's functionality, and it is enough to
allow obsoleting contrib/intagg.
This commit is contained in:
Tom Lane
2008-11-14 00:51:47 +00:00
parent 5b9453bcd3
commit c889ebce0a
7 changed files with 193 additions and 6 deletions
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13
doc/src/sgml/func.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.459 2008/11/13 23:01:09 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/func.sgml,v 1.460 2008/11/14 00:51:46 tgl Exp $ -->
<chapter id="functions">
<title>Functions and Operators</title>
@ -9482,6 +9482,17 @@ SELECT NULLIF(value, '(none)') ...
<entry><literal>string_to_array('xx~^~yy~^~zz', '~^~')</literal></entry>
<entry><literal>{xx,yy,zz}</literal></entry>
</row>
<row>
<entry>
<literal>
<function>unnest</function>(<type>anyarray</type>)
</literal>
</entry>
<entry><type>setof anyelement</type></entry>
<entry>expand an array to a set of rows</entry>
<entry><literal>unnest(ARRAY[1,2])</literal></entry>
<entry><literal>1</literal><para><literal>2</literal></para> (2 rows)</entry>
</row>
</tbody>
</tgroup>
</table>