[sequelize] add where option to DefineIndexesOptions for v4

types/sequelize/index.d.ts

@@ -3247,8 +3247,8 @@ declare namespace sequelize {
              * https://github.com/sequelize/sequelize/blob/master/docs/docs/models-usage.md#user-content-manipulating-the-dataset-with-limit-offset-order-and-group
          */
         group?: string | string[] | Object;
-                     
-                     
+
+
         /**
          * Apply DISTINCT(col) for FindAndCount(all)
          */
@@ -4784,6 +4784,11 @@ declare namespace sequelize {
          */
         operator?: string;
 
+        /**
+         * Condition for partioal index
+         */
+        where?: WhereOptions;
+
     }
 
     /**

types/sequelize/sequelize-tests.ts

@@ -1285,7 +1285,10 @@ s.define( 'UserWithUniqueUsername', {
             name : 'user_and_email_index',
             unique : true,
             method : 'BTREE',
-            fields : ['user_id', { attribute : 'email', collate : 'en_US', order : 'DESC', length : 5 }]
+            fields : ['user_id', { attribute : 'email', collate : 'en_US', order : 'DESC', length : 5 }],
+            where : {
+                user_id : { $not: null }
+            }
         },
         {
             fields: ['data'],