Post Meta WP_Query

$meta_query = array(
	'relation' => 'AND',
	array(
		'key'     => 'post_id',
		'value'   => '1944,1945,1946,1947,1948',
		'compare' => 'IN',
		'type'    => 'NUMERIC',
	),
	array(
		'key'     => '_form_id',
		'value'   => '2',
		'compare' => '=',
		'type'    => 'UNSIGNED',
	),
	array(
		'key'     => '_field_10',
		'compare' => 'EXISTS',
		'type'    => 'UNSIGNED',
	),
	array(
		'key'     => '_field_5',
		'compare' => 'EXISTS',
		'type'    => 'CHAR',
	),
	array(
		'key'     => '_field_7',
		'compare' => 'EXISTS',
		'type'    => 'CHAR',
	),
);