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Posted to dev@arrow.apache.org by "Wes McKinney (JIRA)" <ji...@apache.org> on 2016/03/23 03:01:25 UTC

[jira] [Created] (ARROW-76) Revise format document to include null count, defer non-nullable arrays to the domain of metadata

Wes McKinney created ARROW-76:
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             Summary: Revise format document to include null count, defer non-nullable arrays to the domain of metadata
                 Key: ARROW-76
                 URL: https://issues.apache.org/jira/browse/ARROW-76
             Project: Apache Arrow
          Issue Type: New Feature
          Components: Format
            Reporter: Wes McKinney


After many mailing list discussions and a first draft of metadata serialization (https://github.com/apache/arrow/blob/master/format/Message.fbs), I propose we strike the notion of required fields from the physical memory layout and instead make this a property of the metadata (see the {{nullable}} member of {{Field}} in the serialized schema metadata). 

Note that Arrow implementations will be free to create specialized containers for data having {{nullable = false}} in their metadata. It will be the implementations' responsibility to validate that {{null_count == 0}} at IPC boundaries when interacting with "untrusted" data. 



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