SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 3)
    Identifier key1
    Identifier key2
    Identifier table_1
   TablesInSelectQuery (children 2)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (alias js1) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 3)
           Function arrayJoin (alias key1) (children 1)
            ExpressionList (children 1)
             Literal Array_[UInt64_1, UInt64_2, UInt64_3]
           Literal UInt64_0 (alias key2)
           Literal UInt64_999 (alias table_1)
    TablesInSelectQueryElement (children 2)
     TableExpression (children 1)
      Subquery (alias js2) (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 3)
           Function arrayJoin (alias key1) (children 1)
            ExpressionList (children 1)
             Literal Array_[UInt64_1, UInt64_3, UInt64_2]
           Literal UInt64_0 (alias key2)
           Literal UInt64_999 (alias table_1)
     TableJoin (children 1)
      ExpressionList (children 2)
       Identifier key2
       Identifier key1
   ExpressionList (children 1)
    OrderByElement (children 1)
     Identifier key1