postgres.git / summary / log / commit / refs

commit    aad87e3f25ad751a3d021c139fd3adbbe1d19fce
Author:   Tom Lane <tgl@sss.pgh.pa.us>
Date:     Wed Nov 06 18:32:26 2013 +0000
First released in: 8.4.19, 9.0.15, 9.1.11

    Prevent creating window functions with default arguments.
    
    Insertion of default arguments doesn't work for window functions, which is
    likely to cause a crash at runtime if the implementation code doesn't check
    the number of actual arguments carefully.  It doesn't seem worth working
    harder than this for pre-9.2 branches.


 doc/src/sgml/syntax.sgml      | 7 +++++++
 src/backend/catalog/pg_proc.c | 6 ++++++
 2 files changed, 13 insertions(+)

diff --git a/doc/src/sgml/syntax.sgml b/doc/src/sgml/syntax.sgml
index 9e87186bb53..863de8852b0 100644
--- a/doc/src/sgml/syntax.sgml
+++ b/doc/src/sgml/syntax.sgml
@@ -2464,6 +2464,13 @@ SELECT concat_lower_or_upper('Hello', 'World', uppercase := true);
     having numerous parameters that have default values, named or mixed
     notation can save a great deal of writing and reduce chances for error.
    </para>
+
+   <note>
+    <para>
+     Named and mixed call notations can currently be used only with regular
+     functions, not with aggregate functions or window functions.
+    </para>
+   </note>
   </sect2>
  </sect1>
 
diff --git a/src/backend/catalog/pg_proc.c b/src/backend/catalog/pg_proc.c
index ca21faf7b43..9d5f1a6cbc2 100644
--- a/src/backend/catalog/pg_proc.c
+++ b/src/backend/catalog/pg_proc.c
@@ -285,6 +285,12 @@ ProcedureCreate(const char *procedureName,
 		}
 	}
 
+	/* Guard against a case the planner doesn't handle yet */
+	if (isWindowFunc && parameterDefaults != NIL)
+		ereport(ERROR,
+				(errcode(ERRCODE_FEATURE_NOT_SUPPORTED),
+				 errmsg("window functions cannot have default arguments")));
+
 	/*
 	 * All seems OK; prepare the data to be inserted into pg_proc.
 	 */


[parent: db157fb141df]