WordPress Meta Query Relation

$results = query_posts( array(
 'post_type' => 'event_id',
 'meta_query' => array(
 'relation' => 'AND',
 array(
 'relation' => 'OR',
 array(
 'key' => 'primary_user_id',
 'value' => $user_id
 ),
 array(
 'key' => 'secondary_user_id',
 'value' => $user_id
 )
 ),
 array(
 'key' => 'date',
 'value' => array( $start_date, $end_date ),
 'type' => 'DATETIME',
 'compare' => 'BETWEEN'
 )
 )
) );

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