diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/ObjectsQueries.xml b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/ObjectsQueries.xml
index 623237b..2954227 100644
--- a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/ObjectsQueries.xml
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/ObjectsQueries.xml
@@ -124,6 +124,10 @@
     <compilation-unit name="object_concat">
       <output-dir compare="Text">object_concat</output-dir>
       <expected-warn>ASX0013: Duplicate field name 'v'</expected-warn>
+      <expected-warn>ASX0013: Duplicate field name 'f'</expected-warn>
+      <expected-warn>ASX0013: Duplicate field name 'id'</expected-warn>
+      <expected-warn>ASX0013: Duplicate field name 'id'</expected-warn>
+      <expected-warn>ASX0013: Duplicate field name 'dup'</expected-warn>
     </compilation-unit>
   </test-case>
   <test-case FilePath="objects">
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/object_concat/object_concat.5.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/object_concat/object_concat.5.query.sqlpp
new file mode 100644
index 0000000..1b61e66
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/object_concat/object_concat.5.query.sqlpp
@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+// test that object_concat() issues a warning when encountering a duplicate field
+
+// requesttype=application/json
+// param max-warnings:json=10
+
+SET `import-private-functions` `true`;
+WITH t AS ([{"id": 1, "f": 3}, {"id": 2, "f": 4}])
+SELECT OBJECT_CONCAT_STRICT(t) AS res;
\ No newline at end of file
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/object_concat/object_concat.6.query.sqlpp b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/object_concat/object_concat.6.query.sqlpp
new file mode 100644
index 0000000..8ef2ebbb
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/queries_sqlpp/objects/object_concat/object_concat.6.query.sqlpp
@@ -0,0 +1,27 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements.  See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership.  The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License.  You may obtain a copy of the License at
+ *
+ *   http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing,
+ * software distributed under the License is distributed on an
+ * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
+ * KIND, either express or implied.  See the License for the
+ * specific language governing permissions and limitations
+ * under the License.
+ */
+
+// requesttype=application/json
+// param max-warnings:json=10
+
+WITH a AS (SELECT VALUE x FROM [{"id": 1, "a1": 3, "dup": 0}] AS x),
+b AS (SELECT VALUE y FROM [{"id": 1, "b1": 3, "dup": 5}] AS y)
+FROM a, b
+WHERE a.id = b.id
+SELECT a.*, b.*
\ No newline at end of file
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/object_concat/object_concat.5.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/object_concat/object_concat.5.adm
new file mode 100644
index 0000000..e20e752
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/object_concat/object_concat.5.adm
@@ -0,0 +1 @@
+{ "res": { "id": 2, "f": 4 } }
\ No newline at end of file
diff --git a/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/object_concat/object_concat.6.adm b/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/object_concat/object_concat.6.adm
new file mode 100644
index 0000000..80023c6
--- /dev/null
+++ b/asterixdb/asterix-app/src/test/resources/runtimets/results/objects/object_concat/object_concat.6.adm
@@ -0,0 +1 @@
+{ "id": 1, "b1": 3, "dup": 5, "a1": 3 }
\ No newline at end of file