Julien Le Dem

@isnotinvain @rdblue opinions?

@lirui-tx The main issue here is the format incompatibility and the correctness issue (since "null" doesn't capture at what level it is null) If you don't care about the level...

CCing folks who showed interest in parquet-proto: @qinghui-xu @matt-martin @lukasnalezenec @costimuraru @kgalieva: comments?

This looks good to me. @lukasnalezenec: comments?

@lw-lin @lukasnalezenec: any more comments?

thanks @krishnaprasadas, I see this is still work in progress. Some heads up: To contribute this we'd need to clarify in parquet-format how this works. What encryption algorithm is used?...

I think this proposal has great merits. Here is some more thinking around this idea (thanks to @ianoc for helping me grokking this): The notion of StatefulSummer is the dual...

@johnynek 3) a new trait sounds good to me however it is easy to implement in terms of plus. 4) I think the whole point is that Summer is mutable....

The main idea is that depending on the Monoid implementation either calling `plus` or `sumOption` will be more efficient and that's a characteristic of the Monoid. I'm trying to find...

What's the corresponding apache JIRA? I'd recommend rebasing rather than cherry picking