3 files changed, 26 insertions, 0 deletions
diff --git a/src/test/regress/expected/xml.out b/src/test/regress/expected/xml.out
index fe5ccb8adc..f0c4d0a05c 100644
--- a/src/test/regress/expected/xml.out
+++ b/src/test/regress/expected/xml.out
@@ -77,6 +77,18 @@ SELECT xmlconcat('<?xml version="1.1"?><foo/>', NULL, '<?xml version="1.1" stand
  <?xml version="1.1"?><foo/><bar/>
 (1 row)
 
+SELECT xmlconcat(NULL);
+ xmlconcat 
+-----------
+ 
+(1 row)
+
+SELECT xmlconcat(NULL, NULL);
+ xmlconcat 
+-----------
+ 
+(1 row)
+
 SELECT xmlelement(name element,
                   xmlattributes (1 as one, 'deuce' as two),
                   'content');
diff --git a/src/test/regress/expected/xml_1.out b/src/test/regress/expected/xml_1.out
index 596031dd13..bfa3d612c5 100644
--- a/src/test/regress/expected/xml_1.out
+++ b/src/test/regress/expected/xml_1.out
@@ -79,6 +79,18 @@ LINE 1: SELECT xmlconcat('<?xml version="1.1"?><foo/>', NULL, '<?xml...
                          ^
 DETAIL:  This functionality requires the server to be built with libxml support.
 HINT:  You need to rebuild PostgreSQL using --with-libxml.
+SELECT xmlconcat(NULL);
+ xmlconcat 
+-----------
+ 
+(1 row)
+
+SELECT xmlconcat(NULL, NULL);
+ xmlconcat 
+-----------
+ 
+(1 row)
+
 SELECT xmlelement(name element,
                   xmlattributes (1 as one, 'deuce' as two),
                   'content');
diff --git a/src/test/regress/sql/xml.sql b/src/test/regress/sql/xml.sql
index cae45dd28c..edf639b8c5 100644
--- a/src/test/regress/sql/xml.sql
+++ b/src/test/regress/sql/xml.sql
@@ -26,6 +26,8 @@ SELECT xmlconcat(1, 2);
 SELECT xmlconcat('bad', '<syntax');
 SELECT xmlconcat('<foo/>', NULL, '<?xml version="1.1" standalone="no"?><bar/>');
 SELECT xmlconcat('<?xml version="1.1"?><foo/>', NULL, '<?xml version="1.1" standalone="no"?><bar/>');
+SELECT xmlconcat(NULL);
+SELECT xmlconcat(NULL, NULL);
 
 
 SELECT xmlelement(name element,