SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 2)
    Literal UInt64_1 (alias value)
    Asterisk
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias l) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Literal UInt64_2 (alias key)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias r) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 2)
           Literal UInt64_2 (alias key)
           Literal UInt64_1 (alias value)
     TableJoin (children 1)
      ExpressionList (children 1)
       Identifier key
   Set
