SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 2)
    Function reinterpretAsFloat64 (children 1)
     ExpressionList (children 1)
      Identifier a
    Function reinterpretAsUInt64 (alias a) (children 1)
     ExpressionList (children 1)
      Function toFloat64 (children 1)
       ExpressionList (children 1)
        Literal Float64_0.2