Fix(#4953) : Return null until MySQL implements EMPTY keyword for WKT

lib/dialects/abstract/query.js

@@ -398,13 +398,13 @@ AbstractQuery.formatBindParameters = function(sql, values, dialect, replacementF
   if (!values) {
     return [sql, []];
   }
-  
+
   options = options || {};
   if (typeof replacementFunc !== 'function') {
     options = replacementFunc || {};
     replacementFunc = undefined;
   }
-  
+
   if (!replacementFunc) {
     if (options.skipValueReplace) {
       replacementFunc = function(match, key, values, timeZone, dialect, options) {
@@ -432,15 +432,15 @@ AbstractQuery.formatBindParameters = function(sql, values, dialect, replacementF
       };
     }
   }
-  
+
   var timeZone = null;
   var list = Array.isArray(values);
-  
+
   sql = sql.replace(/\$(\$|\w+)/g, function(match, key) {
     if ('$' === key) {
       return options.skipUnescape ? match : key;
     }
-    
+
     var replVal;
     if (list) {
       if (key.match(/^[1-9]\d*$/)) {

lib/dialects/mysql/data-types.js

@@ -61,8 +61,10 @@ module.exports = function (BaseTypes) {
 
   GEOMETRY.parse = GEOMETRY.prototype.parse = function(value) {
     value = value.buffer();
-    if (value === null) {
-       return null;
+
+    //MySQL doesn't support POINT EMPTY, https://dev.mysql.com/worklog/task/?id=2381
+    if(value === null){
+      return null;
     }
 
     // For some reason, discard the first 4 bytes

test/integration/data-types.test.js

@@ -292,8 +292,13 @@ describe(Support.getTestDialectTeaser('DataTypes'), function() {
         //This case throw unhandled exception
         return User.findAll();
       }).then(function(users){
-        //it contains the null GEOMETRY data
-        expect(users[0].field).to.be.null;
+        if (dialect === 'mysql') {
+          // MySQL will return NULL, becuase they lack EMPTY geometry data support.
+          expect(users[0].field).to.be.eql(null);
+        } else {
+          //it contains the null GEOMETRY data
+          expect(users[0].field).to.be.deep.eql(point);
+        }
       });
    }
  });