Explain EXPLAIN (children 2)
 Set
 SelectWithUnionQuery (children 1)
  ExpressionList (children 1)
   SelectQuery (children 3)
    ExpressionList (children 3)
     Identifier l.id
     Identifier l.value
     Identifier r.description
    TablesInSelectQuery (children 2)
     TablesInSelectQueryElement (children 1)
      TableExpression (children 1)
       TableIdentifier t_l_small (alias l)
     TablesInSelectQueryElement (children 2)
      TableExpression (children 1)
       TableIdentifier t_r_small (alias r)
      TableJoin (children 1)
       Function equals (children 1)
        ExpressionList (children 2)
         Identifier l.id
         Identifier r.id
    ExpressionList (children 2)
     OrderByElement (children 1)
      Identifier r.id
     OrderByElement (children 1)
      Identifier l.id
