Wes McKinney created ARROW-9231:

             Summary: [Format] Increment MetadataVersion from V4 to V5
                 Key: ARROW-9231
                 URL: https://issues.apache.org/jira/browse/ARROW-9231
             Project: Apache Arrow
          Issue Type: Improvement
          Components: Format
            Reporter: Wes McKinney
             Fix For: 1.0.0

We are making enough non-forward-compatible format changes that we should 
increase the format version to V5 while continuing to accept V4 (because the 
changes we've made are backward compatible) and where relevant implementing a 
V4-compatibility mode that disables features where there are changes between 
0.17.x and 1.x

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