SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 3)
   ExpressionList (children 1)
    Function toTypeName (children 1)
     ExpressionList (children 1)
      Identifier x
   TablesInSelectQuery (children 1)
    TablesInSelectQueryElement (children 1)
     TableExpression (children 1)
      Subquery (children 1)
       SelectWithUnionQuery (children 1)
        ExpressionList (children 2)
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function toDecimal32 (alias x) (children 1)
            ExpressionList (children 2)
             Literal \'1234.5\'
             Literal UInt64_5
         SelectQuery (children 1)
          ExpressionList (children 1)
           Function toInt16 (alias x) (children 1)
            ExpressionList (children 1)
             Literal UInt64_0
   Function equals (children 1)
    ExpressionList (children 2)
     Identifier x
     Literal UInt64_0
