SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Function toLowCardinality (children 1)
       ExpressionList (children 1)
        Identifier val
      Literal \'UInt64\'
   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 arrayJoin (alias val) (children 1)
            ExpressionList (children 1)
             Literal Array_[\'1\']