[1] https://lists.apache.org/thread.html/r8216e5de3efd2935e3907ad9bd20ce07e430952f84de69b36337e5eb%40%3Cdev.arrow.apache.org%3E [2] https://docs.google.com/document/d/1xEKRhs-GUSMwjMhgmQdnCNMXwZrA10226AcXRoP8g9E/edit?usp=sharing [3] https://docs.google.com/document/d/1QDwX4ypfNvESc2ywcT1ygaf2Y1R8SmkpifMV7gpJdBI/edit?usp=sharing
On Thu, Jun 24, 2021 at 9:24 AM Weston Pace <weston.p...@gmail.com> wrote: > > The discussion in [1] led to the following question. Before we > proceed on a vote it was decided we should do a straw poll to settle > on an approach (which can then be voted on in a +1/-1 fashion). > > --- > Some date & time libraries have three temporal concepts. For the sake > of this document we will call them LocalDateTime, ZonedDateTime, and > Instant. An Instant is a timestamp that has no meaningful reference > time zone (e.g. events that did not occur on Earth or columns of > timestamps spanning more than one time zone). For more extensive > definitions and a discussion of their semantics and uses see [1]. > Currently Arrow describes how to define two of these three concepts > and there is no guideline on how to store an Instant (assuming the > proposal in [2] passes). > > > This proposal states that Arrow should define how to encode an Instant > into Arrow data. There are several ways this could happen, some which > change schema.fbs and some which do not. > --- > > For sample arguments (currently grouped as "for changing schema.fbs" > and "against changing schema.fbs") see [2]. For a detailed definition > of the terms LocalDateTime, ZonedDateTime, and Instant and a > discussion of their semantics see [3]. > > Options: > > A) Do nothing, don’t introduce the nuance of “instants” into Arrow > B) Do nothing, but update the comments in schema.fbs to acknowledge > the existence of the concept and explain that implementations are free > to decide if/how to support the type. > C) Define timestamp with timezone “UTC” as “instant”. > D) Add a first class instant type to schema.fbs > E) Add instant as a canonical extension type > > Note: This is just a straw poll and the results will not be binding in > any way but will help craft a future vote. For example, if the > plurality of votes goes to C but a majority of votes is spread across > A & B then some flavor of A/B would likely be pursued. > > Vote for as many options as you would like. > > I will summarize and send out the results in 72 hours.
