Debugging Entity Field Query by Displaying the Query as a string

efq_debug.md

function MYMODULE_query_alter($query) {
  if ($query->hasTag('entitydebug')) {
    dpm((string)$query);
  }
}

###Add the TAG in EntityFieldQuery

$q = new EntityFieldQuery;
$q->entityCondition('entity_type', 'node')
  ->addTag('entitydebug')
  ->execute();