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ASF GitHub Bot commented on PARQUET-1950: ----------------------------------------- emkornfield commented on pull request #164: URL: https://github.com/apache/parquet-format/pull/164#issuecomment-771331050 @raduteo the main driver for this PR is there has been a lot of confusion as what is defined as needing core support. I think once we finish this PR I'm not fully opposed to the idea of supporting this field but I think we need to go into greater detail in the specification of what supporting the individual files actually means (and i think willing to help both Java and C++ support both can go a long way to convincing people that it should become a core feature). ---------------------------------------------------------------- This is an automated message from the Apache Git Service. To respond to the message, please log on to GitHub and use the URL above to go to the specific comment. For queries about this service, please contact Infrastructure at: us...@infra.apache.org > Define core features / compliance level > --------------------------------------- > > Key: PARQUET-1950 > URL: https://issues.apache.org/jira/browse/PARQUET-1950 > Project: Parquet > Issue Type: New Feature > Components: parquet-format > Reporter: Gabor Szadovszky > Assignee: Gabor Szadovszky > Priority: Major > > Parquet format is getting more and more features while the different > implementations cannot keep the pace and left behind with some features > implemented and some are not. In many cases it is also not clear if the > related feature is mature enough to be used widely or more an experimental > one. > These are huge issues that makes hard ensure interoperability between the > different implementations. > The following idea came up in a > [discussion|https://lists.apache.org/thread.html/rde5cba8443487bccd47593ddf5dfb39f69c729d260165cb936a1a289%40%3Cdev.parquet.apache.org%3E]. > Create a now document in the parquet-format repository that lists the "core > features". This document is versioned by the parquet-format releases. This > way a certain version of "core features" defines a level of compatibility > between the different implementations. This version number can be written to > a new field (e.g. complianceLevel) in the footer. If an implementation writes > a file with a version in the field it must implement all the related "core > features" (read and write) and must not use any other features at write > because it makes the data unreadable by another implementation if only the > same level of "core features" are implemented. > For example if we have encoding A listed in the version 1 "core features" but > encoding B is not then at "complianceLevel = 1" we can use encoding A but we > cannot use encoding B because it would make the related data unreadable. -- This message was sent by Atlassian Jira (v8.3.4#803005)