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https://issues.apache.org/jira/browse/ARROW-7778?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17031374#comment-17031374
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Antoine Pitrou commented on ARROW-7778:
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Hmm, do you mean dictionaries where the value type is itself a dictionary type?
I thought that was forbidden?
> [C++] Support nested dictionaries in JSON integration format
> ------------------------------------------------------------
>
> Key: ARROW-7778
> URL: https://issues.apache.org/jira/browse/ARROW-7778
> Project: Apache Arrow
> Issue Type: Improvement
> Components: C++
> Reporter: Wes McKinney
> Priority: Major
> Fix For: 1.0.0
>
>
> The {{generate_nested_dictionary_case}} is disabled for all library
> implementations. We support dictionaries-within-dictionaries in IPC (I
> believe) and so need to integration test this
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