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https://issues.apache.org/jira/browse/ARROW-5767?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Micah Kornfield resolved ARROW-5767.
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Resolution: Duplicate
> [Format] Permit dictionary replacements in IPC protocol
> -------------------------------------------------------
>
> Key: ARROW-5767
> URL: https://issues.apache.org/jira/browse/ARROW-5767
> Project: Apache Arrow
> Issue Type: New Feature
> Components: Format
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 0.16.0
>
>
> We permit dictionaries to grow using the {{isDelta}} property in the IPC
> protocol. I think it should be allowed for the same dictionary ID to appear
> in an IPC protocol stream but with {{isDelta=false}}. This would indicate
> that the dictionary in that message is to replace any prior-observed ones in
> subsequent record batches.
> For example, we might have dictionary batches in a stream:
> {code}
> id: 0 isDelta: false values: [a, b, c]
> id: 0 isDelta: true values [d]
> id 0 isDelta: false values [c, a, b]
> {code}
> Such data could easily be produced by a stream producer that is creating
> dictionaries in different execution threads.
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