refactor(sql/where): move more cases to whereQuery

lib/dialects/abstract/query-generator.js

@@ -1630,6 +1630,8 @@ module.exports = (function() {
         if (value instanceof Utils.or || value instanceof Utils.and) {
           key = value instanceof Utils.or ? "$or" : "$and";
           value = value.args;
+        } else if (typeof value === "string") {
+          return value;
         }
       }
 
@@ -1766,7 +1768,10 @@ module.exports = (function() {
           prefix: prepend && tableName
         });
       } else if (typeof smth === 'string') {
-        result = smth;
+        return self.whereItemsQuery(smth, {
+          model: factory,
+          prefix: prepend && tableName
+        });
       } else if (Buffer.isBuffer(smth)) {
         result = this.escape(smth);
       } else if (Array.isArray(smth)) {
@@ -1779,7 +1784,10 @@ module.exports = (function() {
           result = Utils.format(smth, this.dialect);
         }
       } else if (smth === null) {
-        result = '1=1';
+        return self.whereItemsQuery(smth, {
+          model: factory,
+          prefix: prepend && tableName
+        });
       }
 
       return result ? result : '1=1';

test/integration/dialects/mysql/query-generator.test.js

@@ -316,12 +316,12 @@ if (Support.dialectIsMySQL()) {
         }, {
           title: 'no where arguments (string)',
           arguments: ['myTable', {where: ''}],
-          expectation: 'SELECT * FROM `myTable` WHERE 1=1;',
+          expectation: 'SELECT * FROM `myTable`;',
           context: QueryGenerator
         }, {
           title: 'no where arguments (null)',
           arguments: ['myTable', {where: null}],
-          expectation: 'SELECT * FROM `myTable` WHERE 1=1;',
+          expectation: 'SELECT * FROM `myTable`;',
           context: QueryGenerator
         }, {
           title: 'buffer as where argument',

test/integration/dialects/sqlite/query-generator.test.js

@@ -299,12 +299,12 @@ if (dialect === 'sqlite') {
         }, {
           title: 'no where arguments (string)',
           arguments: ['myTable', {where: ''}],
-          expectation: 'SELECT * FROM `myTable` WHERE 1=1;',
+          expectation: 'SELECT * FROM `myTable`;',
           context: QueryGenerator
         }, {
           title: 'no where arguments (null)',
           arguments: ['myTable', {where: null}],
-          expectation: 'SELECT * FROM `myTable` WHERE 1=1;',
+          expectation: 'SELECT * FROM `myTable`;',
           context: QueryGenerator
         }, {
           title: 'buffer as where argument',

test/unit/sql/where.test.js

@@ -78,6 +78,10 @@ suite('SQL', function() {
       });
     };
 
+    testsql(undefined, 'lol=1', {
+      default: "lol=1"
+    });
+
     testsql('deleted', null, {
       default: "`deleted` IS NULL",
       postgres: '"deleted" IS NULL',