Avoid calling Object.prototype methods directly on object instances

lib/utils/date-wrapper.js

@@ -25,7 +25,7 @@ function wrapDates (originalQuery, fields) {
  * @param {object} field
  */
 function _isDateType (field) {
-    return DATE_OIDS.hasOwnProperty(field.dataTypeID);
+    return Object.prototype.hasOwnProperty.call(DATE_OIDS, field.dataTypeID);
 }
 
 /**

lib/utils/overviews-query-rewriter.js

@@ -44,7 +44,7 @@ function overviews_view_for_table (table, overviews_metadata, indent) {
 
     indent = indent || '    ';
     for (var z in overviews_metadata) {
-        if (overviews_metadata.hasOwnProperty(z) && z !== 'schema') {
+        if (Object.prototype.hasOwnProperty.call(overviews_metadata, z) && z !== 'schema') {
             sorted_overviews.push([z, overviews_metadata[z].table]);
         }
     }