diff options
Diffstat (limited to 'doc/src')
| -rw-r--r-- | doc/src/sgml/xaggr.sgml | 12 |
1 files changed, 4 insertions, 8 deletions
diff --git a/doc/src/sgml/xaggr.sgml b/doc/src/sgml/xaggr.sgml index 1175b3640d7..1c34957a166 100644 --- a/doc/src/sgml/xaggr.sgml +++ b/doc/src/sgml/xaggr.sgml @@ -1,4 +1,4 @@ -<!-- $PostgreSQL: pgsql/doc/src/sgml/xaggr.sgml,v 1.38 2009/06/20 18:45:28 tgl Exp $ --> +<!-- $PostgreSQL: pgsql/doc/src/sgml/xaggr.sgml,v 1.39 2010/02/08 20:39:51 tgl Exp $ --> <sect1 id="xaggr"> <title>User-Defined Aggregates</title> @@ -166,14 +166,10 @@ SELECT attrelid::regclass, array_accum(atttypid::regtype) <para> A function written in C can detect that it is being called as an - aggregate transition or final function by seeing if it was passed - an <structname>AggState</> or <structname>WindowAggState</> node - as the function call <quote>context</>, - for example by: + aggregate transition or final function by calling + <function>AggCheckCallContext</>, for example: <programlisting> - if (fcinfo->context && - (IsA(fcinfo->context, AggState) || - IsA(fcinfo->context, WindowAggState))) + if (AggCheckCallContext(fcinfo, NULL)) </programlisting> One reason for checking this is that when it is true for a transition function, the first input |