SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 2)
    Identifier x
    Function arrayJoin (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 1)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function materialize (alias x) (children 1)
            ExpressionList (children 1)
             Function arrayMap (children 1)
              ExpressionList (children 2)
               Function lambda (children 1)
                ExpressionList (children 2)
                 Function tuple (children 1)
                  ExpressionList (children 1)
                   Identifier x
                 Function toFixedString (children 1)
                  ExpressionList (children 2)
                   Identifier x
                   Literal UInt64_5
               Literal Array_[\'Hello\', \'world\']
