diff --git a/lib/Doctrine/ORM/Query/Parser.php b/lib/Doctrine/ORM/Query/Parser.php
index 29fa3f18f..cd1269377 100644
--- a/lib/Doctrine/ORM/Query/Parser.php
+++ b/lib/Doctrine/ORM/Query/Parser.php
@@ -93,7 +93,14 @@ class Parser
      * @var EnityManager
      */
     private $_em;
-
+    
+    /**
+     * The Abtract Syntax Tree of processed DQL query.
+     *
+     * @var SelectStatement | UpdateStatement | DeleteStatement
+     */
+    private $_ast;
+    
     /**
      * The Query to parse.
      *
@@ -140,6 +147,7 @@ class Parser
         $this->_em = $query->getEntityManager();
         $this->_lexer = new Lexer($query->getDql());
         $this->_parserResult = new ParserResult();
+        $this->_ast = null;
     }
 
     /**
@@ -193,6 +201,16 @@ class Parser
         return $this->_em;
     }
     
+    /**
+     * Gets the Abstract Syntax Tree generated by the parser.
+     *
+     * @return SelectStatement | UpdateStatement | DeleteStatement
+     */
+    public function getAST()
+    {
+        return $this->_ast;
+    }
+    
     /**
      * Registers a custom function that returns strings.
      *
@@ -274,10 +292,8 @@ class Parser
         // Parse & build AST
         $AST = $this->QueryLanguage();
         
-        // Check for end of string
-        if ($this->_lexer->lookahead !== null) {
-            $this->syntaxError('end of string');
-        }
+        // Activate semantical checks after this point. Process all deferred checks in pipeline
+        $this->_processDeferredExpressionsStack($AST);
         
         if ($customWalkers = $this->_query->getHint(Query::HINT_CUSTOM_TREE_WALKERS)) {
             $this->_customTreeWalkers = $customWalkers;
@@ -286,9 +302,11 @@ class Parser
         // Run any custom tree walkers over the AST
         if ($this->_customTreeWalkers) {
             $treeWalkerChain = new TreeWalkerChain($this->_query, $this->_parserResult, $this->_queryComponents);
+            
             foreach ($this->_customTreeWalkers as $walker) {
                 $treeWalkerChain->addTreeWalker($walker);
             }
+            
             if ($AST instanceof AST\SelectStatement) {
                 $treeWalkerChain->walkSelectStatement($AST);
             } else if ($AST instanceof AST\UpdateStatement) {
@@ -492,11 +510,11 @@ class Parser
      * @param array $token
      * @param integer $nestingLevel
      */
-    private function _subscribeExpression($expression, $method, $token, $nextingLevel = null)
+    private function _subscribeExpression($expression, $method, $token, $nestingLevel = null)
     {
         $nestingLevel = ($nestingLevel !== null) ?: $this->_nestingLevel;
         
-        $exprStack[] = array(
+        $exprStack = array(
             'method'       => $method,
             'expression'   => $expression,
             'nestingLevel' => $nestingLevel,
@@ -508,13 +526,17 @@ class Parser
 
     /**
      * Processes the topmost stack of deferred path expressions.
+     *
+     * @param mixed $AST
      */
-    private function _processDeferredExpressionsStack()
+    private function _processDeferredExpressionsStack($AST)
     {
         foreach ($this->_deferredExpressionsStack as $item) {
+            if (!isset($item['method'])) var_dump($item);
+        
             $method = '_validate' . $item['method'];
             
-            $this->$method($item['expression'], $item['token'], $item['nestingLevel']);
+            $this->$method($item, $AST);
         }
     }
     
@@ -523,30 +545,35 @@ class Parser
      * Validates that the given <tt>IdentificationVariable</tt> is a semantically correct. 
      * It must exist in query components list.
      *
-     * @param string $identVariable
-     * @param array $token
-     * @param integer $nestingLevel
+     * @param array $deferredItem
+     * @param mixed $AST
      *
      * @return array Query Component
      */
-    private function _validateIdentificationVariable($identVariable, $token, $nestingLevel)
+    private function _validateIdentificationVariable($deferredItem, $AST)
     {
+        $identVariable = $deferredItem['expression'];
+    
         // Check if IdentificationVariable exists in queryComponents
         if ( ! isset($this->_queryComponents[$identVariable])) {
-            $this->semanticalError("'$identVariable' is not defined.", $token);
+            $this->semanticalError(
+                "'$identVariable' is not defined.", $deferredItem['token']
+            );
         }
         
         $qComp = $this->_queryComponents[$identVariable];
         
         // Check if queryComponent points to an AbstractSchemaName or a ResultVariable
         if ( ! isset($qComp['metadata'])) {
-            $this->semanticalError("'$identVariable' does not point to a Class.", $token);
+            $this->semanticalError(
+                "'$identVariable' does not point to a Class.", $deferredItem['token']
+            );
         }
         
         // Validate if identification variable nesting level is lower or equal than the current one
-        if ($qComp['nestingLevel'] > $nestingLevel) {
+        if ($qComp['nestingLevel'] > $deferredItem['nestingLevel']) {
             $this->semanticalError(
-                "'$identVariable' is used outside the scope of its declaration.", $token
+                "'$identVariable' is used outside the scope of its declaration.", $deferredItem['token']
             );
         }
         
@@ -554,75 +581,38 @@ class Parser
     }
     
     /**
-     * Validates that the given <tt>AliasIdentificationVariable</tt> is a semantically correct. 
-     * It must not exist in query components list.
-     *
-     * @param string $aliasIdentVariable
-     * @param array $token
-     * @param integer $nestingLevel
-     *
-     * @return boolean
-     */
-    private function _validateAliasIdentificationVariable($aliasIdentVariable, $token, $nestingLevel)
-    {
-        $exists = isset($this->_queryComponents[$aliasIdentVariable]);
-        
-        if ($exists) {
-            $this->semanticalError("'$aliasIdentVariable' is already defined.", $token);
-        }
-        
-        return $exists;
-    }
-    
-    /**
-     * Validates that the given <tt>AbstractSchemaName</tt> is a semantically correct. 
-     * It must be defined in the scope of Application.
-     *
-     * @param string $schemaName
-     * @param array $token
-     * @param integer $nestingLevel
-     *
-     * @return boolean
-     */
-    private function _validateAbstractSchemaName($schemaName, $token, $nestingLevel)
-    {
-        $exists = class_exists($schemaName, true);
-        
-        if ( ! $exists) {
-            $this->semanticalError("Class '$schemaName' is not defined.", $token);
-        }
-        
-        return $exists;
-    }
-    
-    /**
-     * Validates that the given <tt>AliasIdentificationVariable</tt> is a semantically correct. 
+     * Validates that the given <tt>ResultVariable</tt> is a semantically correct. 
      * It must exist in query components list.
      *
-     * @param string $resultVariable
-     * @param array $token
-     * @param integer $nestingLevel
+     * @param array $deferredItem
+     * @param mixed $AST
      *
      * @return array Query Component
      */
-    private function _validateResultVariable($resultVariable, $token, $nestingLevel)
+    private function _validateResultVariable($deferredItem, $AST)
     {
+        $resultVariable = $deferredItem['expression'];
+        
         // Check if ResultVariable exists in queryComponents
         if ( ! isset($this->_queryComponents[$resultVariable])) {
-            $this->semanticalError("'$resultVariable' is not defined.", $token);
+            $this->semanticalError(
+                "'$resultVariable' is not defined.", $deferredItem['token']
+            );
         }
         
         $qComp = $this->_queryComponents[$resultVariable];
         
         // Check if queryComponent points to an AbstractSchemaName or a ResultVariable
         if ( ! isset($qComp['resultVariable'])) {
-            $this->semanticalError("'$identVariable' does not point to a ResultVariable.", $token);
+            $this->semanticalError(
+                "'$identVariable' does not point to a ResultVariable.", $deferredItem['token']
+            );
         }
         
         // Validate if identification variable nesting level is lower or equal than the current one
-        if ($qComp['nestingLevel'] > $nestingLevel) {
+        if ($qComp['nestingLevel'] > $deferredItem['nestingLevel']) {
             $this->semanticalError(
-                "'$resultVariable' is used outside the scope of its declaration.", $token
+                "'$resultVariable' is used outside the scope of its declaration.", $deferredItem['token']
             );
         }
         
@@ -632,14 +622,14 @@ class Parser
     /**
      * Validates that the given <tt>JoinAssociationPathExpression</tt> is a semantically correct. 
      *
-     * @param JoinAssociationPathExpression $pathExpression
-     * @param array $token
-     * @param integer $nestingLevel
+     * @param array $deferredItem
+     * @param mixed $AST
      *
      * @return array Query Component
      */
-    private function _validateJoinAssociationPathExpression(AST\JoinAssociationPathExpression $pathExpression, $token, $nestingLevel)
+    private function _validateJoinAssociationPathExpression($deferredItem, $AST)
     {
+        $pathExpression = $deferredItem['expression'];
         $qComp = $this->_queryComponents[$pathExpression->identificationVariable];;
         
         // Validating association field (*-to-one or *-to-many)
@@ -662,70 +652,106 @@ class Parser
      * SingleValuedAssociationPathExpression ::= IdentificationVariable "." {SingleValuedAssociationField "."}* SingleValuedAssociationField
      * CollectionValuedPathExpression        ::= IdentificationVariable "." {SingleValuedAssociationField "."}* CollectionValuedAssociationField
      *
-     * @param PathExpression $pathExpression
-     * @param array $token
-     * @param integer $nestingLevel
+     * @param array $deferredItem
+     * @param mixed $AST
      *
      * @return integer
      */
-    private function _validatePathExpression(AST\PathExpression $pathExpression, $token, $nestingLevel)
+    private function _validatePathExpression($deferredItem, $AST)
     {
-        $qComp = $this->_queryComponents[$pathExpression->identificationVariable];
+        $pathExpression = $deferredItem['expression'];
+        $parts = $pathExpression->parts;
+        $numParts = count($parts);
         
+        $qComp = $this->_queryComponents[$pathExpression->identificationVariable];
+            
+        $aliasIdentificationVariable = $pathExpression->identificationVariable;
+        $parentField = $pathExpression->identificationVariable;
         $class = $qComp['metadata'];
-        $stateField = $collectionField = null;
-
-        foreach ($pathExpression->parts as $field) {
+        $fieldType = null;
+        $curIndex = 0;
+            
+        foreach ($parts as $field) {
             // Check if it is not in a state field
-            if ($stateField !== null) {
+            if ($fieldType & AST\PathExpression::TYPE_STATE_FIELD) {
                 $this->semanticalError(
-                    'Cannot navigate through state field named ' . $stateField, $token
+                    'Cannot navigate through state field named ' . $field . ' on ' . $parentField, 
+                    $deferredItem['token']
                 );
             }
             
             // Check if it is not a collection field
-            if ($collectionField !== null) {
+            if ($fieldType & AST\PathExpression::TYPE_COLLECTION_VALUED_ASSOCIATION) {
                 $this->semanticalError(
-                    'Cannot navigate through collection-valued field named ' . $collectionField, 
-                    $token
+                    'Cannot navigate through collection field named ' . $field . ' on ' . $parentField, 
+                    $deferredItem['token']
                 );
             }
             
-            // Check if field exists
+            // Check if field or association exists
             if ( ! isset($class->associationMappings[$field]) && ! isset($class->fieldMappings[$field])) {
                 $this->semanticalError(
-                    'Class ' . $class->name . ' has no field or association named ' . $field, $token
+                    'Class ' . $class->name . ' has no field or association named ' . $field, 
+                    $deferredItem['token']
                 );
             }
+                
+            $parentField = $field;
             
             if (isset($class->fieldMappings[$field])) {
-                $stateField = $field;
-            } else if ($class->associationMappings[$field]->isOneToOne()) {
-                $class = $this->_em->getClassMetadata($class->associationMappings[$field]->targetEntityName);
+                $fieldType = AST\PathExpression::TYPE_STATE_FIELD;
             } else {
-                $collectionField = $field;
+                $assoc = $class->associationMappings[$field];
+                $class = $this->_em->getClassMetadata($assoc->targetEntityName);
+
+                if (
+                    ($curIndex != $numParts - 1) &&
+                    ! isset($this->_queryComponents[$aliasIdentificationVariable . '.' . $field])
+                ) {
+                    // Building queryComponent
+                    $joinQueryComponent = array(
+                        'metadata'     => $class,
+                        'parent'       => $aliasIdentificationVariable,
+                        'relation'     => $assoc,
+                        'map'          => null,
+                        'nestingLevel' => $this->_nestingLevel,
+                        'token'        => $deferredItem['token'],
+                    );
+
+                    // Create AST node
+                    $joinVariableDeclaration = new AST\JoinVariableDeclaration(
+                        new AST\Join(
+                            AST\Join::JOIN_TYPE_INNER, 
+                            new AST\JoinAssociationPathExpression($aliasIdentificationVariable, $field), 
+                            $aliasIdentificationVariable . '.' . $field
+                        ),
+                        null
+                    );
+                    $AST->fromClause->identificationVariableDeclarations[0]->joinVariableDeclarations[] = $joinVariableDeclaration;
+                    
+                    $this->_queryComponents[$aliasIdentificationVariable . '.' . $field] = $joinQueryComponent;
+                }
+                    
+                $aliasIdentificationVariable .= '.' . $field;
+                    
+                if ($assoc->isOneToOne()) {
+                    $fieldType = AST\PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION;
+                } else {
+                    $fieldType = AST\PathExpression::TYPE_COLLECTION_VALUED_ASSOCIATION;
+                }
             }
+            
+            $curIndex++;
         }
         
-        // Recognize correct expression type
-        $expressionType = null;
-        
-        if ($stateField !== null) {
-        	$expressionType = AST\PathExpression::TYPE_STATE_FIELD;
-        } else if ($collectionField !== null) {
-        	$expressionType = AST\PathExpression::TYPE_COLLECTION_VALUED_ASSOCIATION;
-        } else {
-            $expressionType = AST\PathExpression::TYPE_SINGLE_VALUED_ASSOCIATION;
-        } 
-        
         // Validate if PathExpression is one of the expected types
         $expectedType = $pathExpression->expectedType;
 
-        if ( ! ($expectedType & $expressionType)) {
+        if ( ! ($expectedType & $fieldType)) {
             // We need to recognize which was expected type(s)
             $expectedStringTypes = array();
 				
-            // Validate state field type (field/column)
+            // Validate state field type
             if ($expectedType & AST\PathExpression::TYPE_STATE_FIELD) {
                 $expectedStringTypes[] = 'StateFieldPathExpression';
             }
@@ -749,15 +775,14 @@ class Parser
                 $semanticalError .= implode(' or ', $expectedStringTypes) . ' expected.';
             }
             
-            $this->semanticalError($semanticalError, $token);
+            $this->semanticalError($semanticalError, $deferredItem['token']);
         }
         
         // We need to force the type in PathExpression
-        $pathExpression->type = $expressionType;
+        $pathExpression->type = $fieldType;
         
-        return $expressionType;
+        return $fieldType;
     }
-
     
     /**
      * QueryLanguage ::= SelectStatement | UpdateStatement | DeleteStatement
@@ -769,7 +794,7 @@ class Parser
     public function QueryLanguage()
     {
         $this->_lexer->moveNext();
-
+        
         switch ($this->_lexer->lookahead['type']) {
             case Lexer::T_SELECT:
                 return $this->SelectStatement();
@@ -784,6 +809,11 @@ class Parser
                 $this->syntaxError('SELECT, UPDATE or DELETE');
                 break;
         }
+        
+        // Check for end of string
+        if ($this->_lexer->lookahead !== null) {
+            $this->syntaxError('end of string');
+        }
     }
     
 
@@ -807,10 +837,7 @@ class Parser
 
         $selectStatement->orderByClause = $this->_lexer->isNextToken(Lexer::T_ORDER)
             ? $this->OrderByClause() : null;
-
-        // Activate semantical checks after this point. Process all deferred checks in pipeline
-        $this->_processDeferredExpressionsStack();
-
+            
         return $selectStatement;
     }
 
@@ -824,9 +851,6 @@ class Parser
         $updateStatement = new AST\UpdateStatement($this->UpdateClause());
         $updateStatement->whereClause = $this->_lexer->isNextToken(Lexer::T_WHERE) 
             ? $this->WhereClause() : null;
-            
-        // Activate semantical checks after this point. Process all deferred checks in pipeline
-        $this->_processDeferredExpressionsStack();
 
         return $updateStatement;
     }
@@ -841,9 +865,6 @@ class Parser
         $deleteStatement = new AST\DeleteStatement($this->DeleteClause());
         $deleteStatement->whereClause = $this->_lexer->isNextToken(Lexer::T_WHERE) 
             ? $this->WhereClause() : null;
-            
-        // Activate semantical checks after this point. Process all deferred checks in pipeline
-        $this->_processDeferredExpressionsStack();
 
         return $deleteStatement;
     }
@@ -883,11 +904,13 @@ class Parser
         $this->match(Lexer::T_IDENTIFIER);
         
         $aliasIdentVariable = $this->_lexer->token['value'];
+        $exists = isset($this->_queryComponents[$aliasIdentVariable]);
         
-        // Apply AliasIdentificationVariable validation
-        $this->_validateAliasIdentificationVariable(
-            $aliasIdentVariable, $this->_lexer->token, $this->_nestingLevel
-        );
+        if ($exists) {
+            $this->semanticalError(
+                "'$aliasIdentVariable' is already defined.", $this->_lexer->token
+            );
+        }
 
         return $aliasIdentVariable;
     }
@@ -902,15 +925,36 @@ class Parser
         $this->match(Lexer::T_IDENTIFIER);
 
         $schemaName = $this->_lexer->token['value'];
+        $exists = class_exists($schemaName, true);
         
-        // Apply AbstractSchemaName validation
-        $this->_validateAbstractSchemaName(
-            $schemaName, $this->_lexer->token, $this->_nestingLevel
-        );
+        if ( ! $exists) {
+            $this->semanticalError("Class '$schemaName' is not defined.", $this->_lexer->token);
+        }
 
         return $schemaName;
     }
     
+    /**
+     * AliasResultVariable ::= identifier
+     *
+     * @return string
+     */
+    public function AliasResultVariable()
+    {
+        $this->match(Lexer::T_IDENTIFIER);
+    
+        $resultVariable = $this->_lexer->token['value'];
+        $exists = isset($this->_queryComponents[$resultVariable]);
+        
+        if ($exists) {
+            $this->semanticalError(
+                "'$resultVariable' is already defined.", $this->_lexer->token
+            );
+        }
+        
+        return $resultVariable;
+    }
+    
     /**
      * ResultVariable ::= identifier
      *
@@ -923,15 +967,11 @@ class Parser
         $resultVariable = $this->_lexer->token['value'];
         
         // Defer ResultVariable validation
-        $exprStack = array(
-            'method'       => 'ResultVariable',
-            'expression'   => $resultVariable,
-            'nestingLevel' => $this->_nestingLevel,
-            'token'        => $this->_lexer->token,
+        $this->_subscribeExpression(
+            $resultVariable, 'ResultVariable',
+            $this->_lexer->token, $this->_nestingLevel
         );
-
-        array_push($this->_deferredExpressionsStack, $exprStack);
-
+        
         return $resultVariable;
     }
     
@@ -953,14 +993,10 @@ class Parser
         $pathExpr = new AST\JoinAssociationPathExpression($identVariable, $field);
         
         // Defer JoinAssociationPathExpression validation
-        $exprStack = array(
-            'method'       => 'JoinAssociationPathExpression',
-            'expression'   => $pathExpr,
-            'nestingLevel' => $this->_nestingLevel,
-            'token'        => $token,
+        $this->_subscribeExpression(
+            $pathExpr, 'JoinAssociationPathExpression',
+            $token, $this->_nestingLevel
         );
-
-        array_push($this->_deferredExpressionsStack, $exprStack);
         
         return $pathExpr;
     }  
@@ -969,7 +1005,7 @@ class Parser
      * Parses an arbitrary path expression and defers semantical validation 
      * based on expected types.
      *
-     * PathExpression ::= IdentificationVariable "." {identifier "."}* identifier
+     * PathExpression ::= IdentificationVariable {"." identifier}* "." identifier
      *
      * @param integer $expectedTypes
      * @return \Doctrine\ORM\Query\AST\PathExpression
@@ -991,14 +1027,10 @@ class Parser
         $pathExpr = new AST\PathExpression($expectedTypes, $identVariable, $parts);
         
         // Defer PathExpression validation if requested to be defered
-        $exprStack = array(
-            'method'       => 'PathExpression',
-            'expression'   => $pathExpr,
-            'nestingLevel' => $this->_nestingLevel,
-            'token'        => $token,
+        $this->_subscribeExpression(
+            $pathExpr, 'PathExpression',
+            $token, $this->_nestingLevel
         );
-        
-        array_push($this->_deferredExpressionsStack, $exprStack);
 
         return $pathExpr;
     }
@@ -1598,7 +1630,7 @@ class Parser
             );
         }
 
-        $targetClassName = $parentClass->getAssociationMapping($assocField)->getTargetEntityName();
+        $targetClassName = $parentClass->getAssociationMapping($assocField)->targetEntityName;
 
         // Building queryComponent
         $joinQueryComponent = array(
@@ -1651,7 +1683,7 @@ class Parser
     /**
      * SelectExpression ::=
      *      IdentificationVariable | StateFieldPathExpression |
-     *      (AggregateExpression | "(" Subselect ")" | FunctionDeclaration) [["AS"] ResultVariable]
+     *      (AggregateExpression | "(" Subselect ")" | FunctionDeclaration) [["AS"] AliasResultVariable]
      *
      * @return \Doctrine\ORM\Query\AST\SelectExpression
      */
@@ -1683,9 +1715,9 @@ class Parser
 
             if ($this->_lexer->isNextToken(Lexer::T_IDENTIFIER)) {
                 $token = $this->_lexer->lookahead;
-                $fieldAliasIdentificationVariable = $this->ResultVariable();
+                $fieldAliasIdentificationVariable = $this->AliasResultVariable();
                 
-                // Include ResultVariable in query components.
+                // Include AliasResultVariable in query components.
                 $this->_queryComponents[$fieldAliasIdentificationVariable] = array(
                     'resultVariable' => $expression,
                     'nestingLevel'   => $this->_nestingLevel,
@@ -1708,7 +1740,7 @@ class Parser
     }
 
     /**
-     * SimpleSelectExpression ::= StateFieldPathExpression | IdentificationVariable | (AggregateExpression [["AS"] ResultVariable])
+     * SimpleSelectExpression ::= StateFieldPathExpression | IdentificationVariable | (AggregateExpression [["AS"] AliasResultVariable])
      *
      * @return \Doctrine\ORM\Query\AST\SimpleSelectExpression
      */
@@ -1735,10 +1767,10 @@ class Parser
 
         if ($this->_lexer->isNextToken(Lexer::T_IDENTIFIER)) {
             $token = $this->_lexer->lookahead;
-            $resultVariable = $this->ResultVariable();
+            $resultVariable = $this->AliasResultVariable();
             $expr->fieldIdentificationVariable = $resultVariable;
                 
-            // Include ResultVariable in query components.
+            // Include AliasResultVariable in query components.
             $this->_queryComponents[$resultVariable] = array(
                 'resultvariable' => $expr,
                 'nestingLevel'   => $this->_nestingLevel,
diff --git a/lib/Doctrine/ORM/Query/SqlWalker.php b/lib/Doctrine/ORM/Query/SqlWalker.php
index 83400e5ad..4c3bd80b5 100644
--- a/lib/Doctrine/ORM/Query/SqlWalker.php
+++ b/lib/Doctrine/ORM/Query/SqlWalker.php
@@ -414,9 +414,8 @@ class SqlWalker implements TreeWalker
         switch ($pathExpr->type) {
             case AST\PathExpression::TYPE_STATE_FIELD:
                 $parts = $pathExpr->parts;
-                $numParts = count($parts);
-                $dqlAlias = $pathExpr->identificationVariable;
-                $fieldName = $parts[$numParts - 1];
+                $fieldName = array_pop($parts);
+                $dqlAlias = $pathExpr->identificationVariable . (( ! empty($parts)) ? '.' . implode('.', $parts) : '');
                 $qComp = $this->_queryComponents[$dqlAlias];
                 $class = $qComp['metadata'];
 
@@ -609,20 +608,18 @@ class SqlWalker implements TreeWalker
      */
     public function walkOrderByItem($orderByItem)
     {
+        $sql = '';
         $expr = $orderByItem->expression;
+        
         if ($expr instanceof AST\PathExpression) {
-            $parts = $expr->parts;
-            $dqlAlias = $expr->identificationVariable;
-            $class = $this->_queryComponents[$dqlAlias]['metadata'];
-            $columnName = $class->getQuotedColumnName($parts[0], $this->_platform);
-            
-            return $this->getSqlTableAlias($class->getTableName(), $dqlAlias) . '.' 
-                    . $columnName . ' ' . strtoupper($orderByItem->type);
+            $sql = $this->walkPathExpression($expr);
         } else {
             $columnName = $this->_queryComponents[$expr]['token']['value'];
 
-            return $this->_scalarResultAliasMap[$columnName] . ' ' . strtoupper($orderByItem->type);
+            $sql = $this->_scalarResultAliasMap[$columnName];
         }
+        
+        return $sql . ' ' . strtoupper($orderByItem->type);;
     }
 
     /**
@@ -771,16 +768,15 @@ class SqlWalker implements TreeWalker
         if ($expr instanceof AST\PathExpression) {
             if ($expr->type == AST\PathExpression::TYPE_STATE_FIELD) {
                 $parts = $expr->parts;
-                $numParts = count($parts);
-                $dqlAlias = $expr->identificationVariable;
-                $fieldName = $parts[$numParts - 1];
+                $fieldName = array_pop($parts);
+                $dqlAlias = $expr->identificationVariable . (( ! empty($parts)) ? '.' . implode('.', $parts) : '');
                 $qComp = $this->_queryComponents[$dqlAlias];
                 $class = $qComp['metadata'];
 
                 if ( ! isset($this->_selectedClasses[$dqlAlias])) {
                     $this->_selectedClasses[$dqlAlias] = $class;
                 }
-
+                
                 $sqlTableAlias = $this->getSqlTableAlias($class->getTableName(), $dqlAlias);
                 $columnName = $class->getQuotedColumnName($fieldName, $this->_platform);
                 $columnAlias = $this->getSqlColumnAlias($class->columnNames[$fieldName]);
@@ -1004,17 +1000,8 @@ class SqlWalker implements TreeWalker
      */
     public function walkAggregateExpression($aggExpression)
     {
-        $sql = '';
-        $parts = $aggExpression->pathExpression->parts;
-        $dqlAlias = $aggExpression->pathExpression->identificationVariable;
-        $fieldName = $parts[0];
-
-        $qComp = $this->_queryComponents[$dqlAlias];
-        $columnName = $qComp['metadata']->getQuotedColumnName($fieldName, $this->_platform);
-
         return $aggExpression->functionName . '(' . ($aggExpression->isDistinct ? 'DISTINCT ' : '')
-             . $this->getSqlTableAlias($qComp['metadata']->getTableName(), $dqlAlias) . '.' 
-             . $columnName . ')';
+             . $this->walkPathExpression($aggExpression->pathExpression) . ')';
     }
 
     /**
@@ -1038,12 +1025,7 @@ class SqlWalker implements TreeWalker
      */
     public function walkGroupByItem(AST\PathExpression $pathExpr)
     {
-        $parts = $pathExpr->parts;
-        $dqlAlias = $pathExpr->identificationVariable;
-        $qComp = $this->_queryComponents[$dqlAlias];
-        $columnName = $qComp['metadata']->getQuotedColumnName($parts[0], $this->_platform);
-        
-        return $this->getSqlTableAlias($qComp['metadata']->getTableName(), $dqlAlias) . '.' . $columnName;
+        return $this->walkPathExpression($pathExpr);
     }
 
     /**
@@ -1219,8 +1201,10 @@ class SqlWalker implements TreeWalker
         $sql .= 'EXISTS (SELECT 1 FROM ';
         $entityExpr = $collMemberExpr->entityExpression;
         $collPathExpr = $collMemberExpr->collectionValuedPathExpression;
+        
         $parts = $collPathExpr->parts;
-        $dqlAlias = $collPathExpr->identificationVariable;
+        $fieldName = array_pop($parts);
+        $dqlAlias = $collPathExpr->identificationVariable . (( ! empty($parts)) ? '.' . implode('.', $parts) : '');
         
         $class = $this->_queryComponents[$dqlAlias]['metadata'];
         
@@ -1232,7 +1216,7 @@ class SqlWalker implements TreeWalker
             throw DoctrineException::notImplemented();
         }
         
-        $assoc = $class->associationMappings[$parts[0]];
+        $assoc = $class->associationMappings[$fieldName];
         
         if ($assoc->isOneToMany()) {
             $targetClass = $this->_em->getClassMetadata($assoc->targetEntityName);
diff --git a/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php b/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php
index dd29657cf..adedff266 100644
--- a/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php
+++ b/tests/Doctrine/Tests/ORM/Query/LanguageRecognitionTest.php
@@ -58,6 +58,25 @@ class LanguageRecognitionTest extends \Doctrine\Tests\OrmTestCase
         
         return $parser->parse();
     }
+    
+    public function parseDqlForAST($dql, $hints = array())
+    {
+        $query = $this->_em->createQuery($dql);
+        $query->setHint(Query::HINT_FORCE_PARTIAL_LOAD, true);
+        $query->setDql($dql);
+        
+        foreach ($hints as $key => $value) {
+        	$query->setHint($key, $value);
+        }
+        
+        $parser = new \Doctrine\ORM\Query\Parser($query);
+        // We do NOT test SQL output here. That only unnecessarily slows down the tests!
+        $parser->setCustomOutputTreeWalker('Doctrine\Tests\Mocks\MockTreeWalker');
+        $parser->parse();
+        
+        return $parser->getAST();
+    }
+
 
     public function testEmptyQueryString()
     {
@@ -84,6 +103,11 @@ class LanguageRecognitionTest extends \Doctrine\Tests\OrmTestCase
         $this->assertValidDql('SELECT u, p FROM Doctrine\Tests\Models\CMS\CmsUser u JOIN u.phonenumbers p');
     }
 
+    public function testSelectMultipleComponentsWithAsterisk2()
+    {
+        $this->assertValidDql('SELECT a.user.name FROM Doctrine\Tests\Models\CMS\CmsArticle a');
+    }
+
     public function testSelectDistinctIsSupported()
     {
         $this->assertValidDql('SELECT DISTINCT u.name FROM Doctrine\Tests\Models\CMS\CmsUser u');
@@ -93,6 +117,11 @@ class LanguageRecognitionTest extends \Doctrine\Tests\OrmTestCase
     {
         $this->assertValidDql('SELECT COUNT(u.id) FROM Doctrine\Tests\Models\CMS\CmsUser u');
     }
+    
+    public function testDuplicatedAliasInAggregateFunction()
+    {
+        $this->assertInvalidDql('SELECT COUNT(u.id) AS num, SUM(u.id) AS num FROM Doctrine\Tests\Models\CMS\CmsUser u');
+    }
 
     public function testAggregateFunctionWithDistinctInSelect()
     {
diff --git a/tests/Doctrine/Tests/ORM/Query/SelectSqlGenerationTest.php b/tests/Doctrine/Tests/ORM/Query/SelectSqlGenerationTest.php
index 2674382cf..3fbb31ec6 100644
--- a/tests/Doctrine/Tests/ORM/Query/SelectSqlGenerationTest.php
+++ b/tests/Doctrine/Tests/ORM/Query/SelectSqlGenerationTest.php
@@ -2,7 +2,8 @@
 
 namespace Doctrine\Tests\ORM\Query;
 
-use Doctrine\ORM\Query;
+use Doctrine\ORM\Query,
+    Doctrine\Common\DoctrineException;
 
 require_once __DIR__ . '/../../TestInit.php';
 
@@ -22,7 +23,7 @@ class SelectSqlGenerationTest extends \Doctrine\Tests\OrmTestCase
             $query->setHint(Query::HINT_FORCE_PARTIAL_LOAD, true);
             parent::assertEquals($sqlToBeConfirmed, $query->getSql());
             $query->free();
-        } catch (Doctrine_Exception $e) {
+        } catch (DoctrineException $e) {
             $this->fail($e->getMessage());
         }
     }
@@ -42,6 +43,22 @@ class SelectSqlGenerationTest extends \Doctrine\Tests\OrmTestCase
             'SELECT c0_.id AS id0 FROM cms_users c0_'
         );
     }
+    
+    public function testSupportsSelectForOneNestedField()
+    {
+        $this->assertSqlGeneration(
+            'SELECT a.user.id FROM Doctrine\Tests\Models\CMS\CmsArticle a',
+            'SELECT c0_.id AS id0 FROM cms_articles c1_ INNER JOIN cms_users c0_ ON c1_.user_id = c0_.id'
+        );
+    }
+    
+    public function testSupportsSelectForAllNestedField()
+    {
+        $this->assertSqlGeneration(
+            'SELECT a FROM Doctrine\Tests\Models\CMS\CmsArticle a ORDER BY a.user.name ASC',
+            'SELECT c0_.id AS id0, c0_.topic AS topic1, c0_.text AS text2 FROM cms_articles c0_ INNER JOIN cms_users c1_ ON c0_.user_id = c1_.id ORDER BY c1_.name ASC'
+        );
+    }
 
     public function testSupportsSelectForMultipleColumnsOfASingleComponent()
     {