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parent_user_unread comment

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'parent_user_id',
		'value'   => '1',
		'compare' => '=',
		'type'    => 'NUMERIC',
	),
	array(
		'key'     => 'parent_user_read',
		'compare' => '=',
		'type'    => 'NUMERIC',
	),
);