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Reduce contrib/intagg to a thin wrapper around the new core functions

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array_agg() and unnest().  We could drop it entirely in the future,
but let's keep it for a release or two as a compatibility assist.
This commit is contained in:
Tom Lane
2008-11-14 19:58:45 +00:00
parent 9e0247aba5
commit 32cc9e5533
5 changed files with 25 additions and 321 deletions
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34
doc/src/sgml/intagg.sgml
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@ -1,4 +1,4 @@
<!-- $PostgreSQL: pgsql/doc/src/sgml/intagg.sgml,v 1.3 2007/12/10 05:32:51 tgl Exp $ -->
<!-- $PostgreSQL: pgsql/doc/src/sgml/intagg.sgml,v 1.4 2008/11/14 19:58:45 tgl Exp $ -->
<sect1 id="intagg">
<title>intagg</title>
@ -9,7 +9,10 @@
<para>
The <filename>intagg</filename> module provides an integer aggregator and an
enumerator.
enumerator. <filename>intagg</filename> is now obsolete, because there
are built-in functions that provide a superset of its capabilities.
However, the module is still provided as a compatibility wrapper around
the built-in functions.
</para>
<sect2>
@ -20,38 +23,19 @@
<function>int_array_aggregate(integer)</>
that produces an integer array
containing exactly the integers it is fed.
Here is a not-tremendously-useful example:
This is a wrapper around <function>array_agg</>,
which does the same thing for any array type.
</para>
<programlisting>
test=# select int_array_aggregate(i) from
test-# generate_series(1,10,2) i;
int_array_aggregate
---------------------
{1,3,5,7,9}
(1 row)
</programlisting>
<para>
The enumerator is a function
<function>int_array_enum(integer[])</>
that returns <type>setof integer</>. It is essentially the reverse
operation of the aggregator: given an array of integers, expand it
into a set of rows. For example,
into a set of rows. This is a wrapper around <function>unnest</>,
which does the same thing for any array type.
</para>
<programlisting>
test=# select * from int_array_enum(array[1,3,5,7,9]);
int_array_enum
----------------
1
3
5
7
9
(5 rows)
</programlisting>
</sect2>
<sect2>