SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function hex (children 1)
     ExpressionList (children 1)
      Function sipHash128ReferenceKeyed (children 1)
       ExpressionList (children 2)
        Identifier key
        Function CAST (children 1)
         ExpressionList (children 2)
          Literal \'4\'
          Literal \'UInt64\'
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier tab
