fix(query-generator): add spaces around comparator (#9427)

lib/dialects/abstract/query-generator.js

@@ -1918,7 +1918,7 @@ class QueryGenerator {
       if (value && value instanceof Utils.SequelizeMethod) {
         value = this.getWhereConditions(value, tableName, factory, options, prepend);
 
-        result = value === 'NULL' ? key + ' IS NULL' : [key, value].join(smth.comparator);
+        result = value === 'NULL' ? key + ' IS NULL' : [key, value].join(' ' + smth.comparator + ' ');
       } else if (_.isPlainObject(value)) {
         result = this.whereItemQuery(smth.attribute, value, {
           model: factory

test/unit/dialects/abstract/query-generator.test.js

@@ -86,6 +86,12 @@ describe('QueryGenerator', () => {
       expect(() => QG.whereItemQuery('test', {$in: [4]}))
         .to.throw('Invalid value { \'$in\': [ 4 ] }');
     });
+
+    it('should correctly parse sequelize.where with .fn as logic', function() {
+      const QG = getAbstractQueryGenerator(this.sequelize);
+      QG.handleSequelizeMethod(this.sequelize.where(this.sequelize.col('foo'), 'LIKE', this.sequelize.col('bar')))
+        .should.be.equal('foo LIKE bar');
+    });
   });
 });