other(find-all): throw on empty attributes (#11867)

lib/dialects/abstract/query-generator.js

@@ -1365,6 +1365,7 @@ class QueryGenerator {
     }
 
     if (subQuery) {
+      this._throwOnEmptyAttributes(attributes.main, { modelName: model && model.name, as: mainTable.as });
       query = `SELECT ${attributes.main.join(', ')} FROM (${subQueryItems.join('')}) AS ${mainTable.as}${mainJoinQueries.join('')}${mainQueryItems.join('')}`;
     } else {
       query = mainQueryItems.join('');
@@ -2053,7 +2054,17 @@ class QueryGenerator {
     return { mainQueryOrder, subQueryOrder };
   }
 
+  _throwOnEmptyAttributes(attributes, extraInfo = {}) {
+    if (attributes.length > 0) return;
+    const asPart = extraInfo.as && `as ${extraInfo.as}` || '';
+    const namePart = extraInfo.modelName && `for model '${extraInfo.modelName}'` || '';
+    const message = `Attempted a SELECT query ${namePart} ${asPart} without selecting any columns`;
+    throw new sequelizeError.QueryError(message.replace(/ +/g, ' '));
+  }
+
   selectFromTableFragment(options, model, attributes, tables, mainTableAs) {
+    this._throwOnEmptyAttributes(attributes, { modelName: model && model.name, as: mainTableAs });
+
     let fragment = `SELECT ${attributes.join(', ')} FROM ${tables}`;
 
     if (mainTableAs) {

lib/dialects/mssql/query-generator.js

@@ -837,6 +837,8 @@ class MSSQLQueryGenerator extends AbstractQueryGenerator {
   }
 
   selectFromTableFragment(options, model, attributes, tables, mainTableAs, where) {
+    this._throwOnEmptyAttributes(attributes, { modelName: model && model.name, as: mainTableAs });
+    
     const dbVersion = this.sequelize.options.databaseVersion;
     const isSQLServer2008 = semver.valid(dbVersion) && semver.lt(dbVersion, '11.0.0');
 

test/integration/model/findAll.test.js

@@ -60,6 +60,38 @@ describe(Support.getTestDialectTeaser('Model'), () => {
       });
     });
 
+    it('should throw on an attempt to fetch no attributes', function() {
+      return expect(this.User.findAll({ attributes: [] })).to.be.rejectedWith(
+        Sequelize.QueryError,
+        /^Attempted a SELECT query.+without selecting any columns$/
+      );
+    });
+
+    it('should not throw if overall attributes are nonempty', function() {
+      const Post = this.sequelize.define('Post', { foo: DataTypes.STRING });
+      const Comment = this.sequelize.define('Comment', { bar: DataTypes.STRING });
+      Post.hasMany(Comment, { as: 'comments' });
+      return Post.sync({ force: true })
+        .then(() => Comment.sync({ force: true }))
+        .then(() => {
+          // Should not throw in this case, even
+          // though `attributes: []` is set for the main model
+          return Post.findAll({
+            raw: true,
+            attributes: [],
+            include: [
+              {
+                model: Comment,
+                as: 'comments',
+                attributes: [
+                  [Sequelize.fn('COUNT', Sequelize.col('comments.id')), 'commentCount']
+                ]
+              }
+            ]
+          });
+        });
+    });
+
     describe('special where conditions/smartWhere object', () => {
       beforeEach(function() {
         this.buf = Buffer.alloc(16);