SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function CAST (children 1)
     ExpressionList (children 2)
      Identifier x
      Literal \'UInt64\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier t
   Function equals (children 1)
    ExpressionList (children 2)
     Function toUInt64 (children 1)
      ExpressionList (children 1)
       Identifier x
     Literal UInt64_1