use arrays for aliasing in select queries

lib/connectors/mysql/query-generator.js

@@ -56,7 +56,12 @@ var QueryGenerator = module.exports = {
   selectQuery: function(tableName, options) {
   selectQuery: function(tableName, options) {
     options = options || {}
     options = options || {}
     options.table = Utils.addTicks(tableName)
     options.table = Utils.addTicks(tableName)
-    options.attributes = options.attributes && options.attributes.map(function(attr){return Utils.addTicks(attr)}).join(", ")
+    options.attributes = options.attributes && options.attributes.map(function(attr){
+      if(Array.isArray(attr) && attr.length == 2)
+        return [attr[0], Utils.addTicks(attr[1])].join(' as ')
+      else
+        return Utils.addTicks(attr)
+    }).join(", ")
     options.attributes = options.attributes || '*'
     options.attributes = options.attributes || '*'
 
 
     var query = "SELECT <%= attributes %> FROM <%= table %>"
     var query = "SELECT <%= attributes %> FROM <%= table %>"

spec/query-generator.mysql.spec.js

@@ -17,4 +17,14 @@ describe('QueryGenerator', function() {
       )
       )
     })
     })
   })
   })
+
+  describe('selectQuery', function() {
+    it("should correctly convert arrays into aliases", function() {
+      expect(
+        QueryGenerator.selectQuery('foo', { attributes: [['count(*)', 'count']] })
+      ).toEqual(
+        'SELECT count(*) as `count` FROM `foo`;'
+      )
+    })
+  })
 })
 })