Breaks with Fixing Identification Variables and SQL Walkers - 2

// Fix order of identification variables.
// They have to appear in the select clause in the same order as the
// declarations (from ... x join ... y join ... z ...) appear in the query
// as the hydration process relies on that order for proper operation.
if ( count($this->_identVariableExpressions) > 1) {
  foreach ($this->_queryComponents as $dqlAlias => $qComp) {
    if (isset($this->_identVariableExpressions[$dqlAlias])) {
      $expr = $this->_identVariableExpressions[$dqlAlias];
      $key = array_search($expr, $AST->selectClause->selectExpressions);
      unset($AST->selectClause->selectExpressions[$key]);
      $AST->selectClause->selectExpressions[] = $expr;
    }
  }
}

$key = array_search($expr, $AST->selectClause->selectExpressions);
unset($AST->selectClause->selectExpressions[$key]);