Hi Gyewon,

thanks for the comments. I have few questions:

1) I actually need order because I am serializing pipelines of operators
one a time and I need to maintain the order in which operators appear. Is
this against Tang design?

2) Mmm my implementation for Avro is basically a copy of how sets are
serialized: they are mapped to strings and enumerated. Where was union
required?

Best,
Matteo

On Thu, Jan 4, 2018 at 5:32 PM, Gyewon Lee <[EMAIL PROTECTED]> wrote: