SelectWithUnionQuery (children 1)
 ExpressionList (children 1)
  SelectQuery (children 1)
   ExpressionList (children 6)
    Literal Float64_nan (alias lhs)
    Function CAST (alias rhs) (children 1)
     ExpressionList (children 2)
      Literal Float64_nan
      Literal \'Float32\'
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier lhs
      Identifier rhs
    Function equals (children 1)
     ExpressionList (children 2)
      Identifier lhs
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier rhs
    Function equals (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier lhs
      Identifier rhs
    Function equals (children 1)
     ExpressionList (children 2)
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier lhs
      Function materialize (children 1)
       ExpressionList (children 1)
        Identifier rhs
