SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function arrayStringConcat (children 1)
     ExpressionList (children 2)
      Identifier arr
      Literal \'; \'
   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 array (alias arr) (children 1)
            ExpressionList (children 3)
             Function toDate (children 1)
              ExpressionList (children 1)
               Literal \'2021-10-01\'
             Literal NULL
             Function toDate (children 1)
              ExpressionList (children 1)
               Literal \'2021-10-02\'