Moving geometry select statement into dialect query-generator.

lib/dialects/abstract/query-generator.js

@@ -2149,7 +2149,7 @@ var QueryGenerator = {
   },
 
   geometrySelect: function(column) {
-    return 'AsText(' + this.quoteIdentifiers(column) + ') AS ' + column;
+    return this.quoteIdentifiers(column);
   }
 };
 

lib/dialects/mysql/query-generator.js

@@ -383,6 +383,10 @@ var QueryGenerator = {
    */
   dropForeignKeyQuery: function(tableName, foreignKey) {
     return 'ALTER TABLE ' + this.quoteTable(tableName) + ' DROP FOREIGN KEY ' + this.quoteIdentifier(foreignKey) + ';';
+  },
+
+  geometrySelect: function(column) {
+    return 'AsText(' + this.quoteIdentifiers(column) + ') AS ' + column;
   }  
 };