SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 2)
   ExpressionList (children 1)
    Function if (children 1)
     ExpressionList (children 3)
      Function toUInt8 (children 1)
       ExpressionList (children 1)
        Function toUInt8 (children 1)
         ExpressionList (children 1)
          Literal UInt64_0
      Identifier y
      Literal UInt64_42
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      TableIdentifier test
