diff --git a/server/endpoints/QueryEndpointHandler.ts b/server/endpoints/QueryEndpointHandler.ts
index d8bc861..4707b32 100644
--- a/server/endpoints/QueryEndpointHandler.ts
+++ b/server/endpoints/QueryEndpointHandler.ts
@@ -177,9 +177,13 @@ function constructQuery(knex: Knex, queryFor: ObjectType, queryElem: api.QueryEl
     joinObjects.delete(queryFor); // We are already querying this object in the base query.
 
     // Figure out what data we want to select from the results.
-    var columns: any[] = [];
-    joinObjects.forEach((obj: ObjectType) => columns.push(...objectColumns[obj]));
-    columns.push(...objectColumns[queryFor]);
+    var columns: any[] = objectColumns[queryFor];
+
+    // TODO: there was a line here to add columns for the joined objects.
+    // Could not get it to work with Postgres, which wants aggregate functions
+    // to specify exactly how duplicates should be aggregated.
+    // Not sure whether we need these columns in the first place.
+    // joinObjects.forEach((obj: ObjectType) => columns.push(...objectColumns[obj]));
 
     // First, we create a base query for the type of object we need to yield.
     var q = knex.select(columns)
diff --git a/server/test/test.sh b/server/test/test.sh
index 4273e5f..b5c72f8 100755
--- a/server/test/test.sh
+++ b/server/test/test.sh
@@ -3,8 +3,6 @@
 # Wrapper around the Jasmine test scripts.
 # Can test with different types of databases.
 
-set -x 
-
 SCRIPT=`realpath $0`
 SCRIPTPATH=`dirname $SCRIPT`
 SOURCEPATH="$SCRIPTPATH/.."