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https://issues.apache.org/jira/browse/ARROW-4709?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17599627#comment-17599627
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Antoine Pitrou commented on ARROW-4709:
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cc [~benpharkins] if you'd like to tackle a performance issue at some point.
> [C++] Optimize for ordered JSON fields
> --------------------------------------
>
> Key: ARROW-4709
> URL: https://issues.apache.org/jira/browse/ARROW-4709
> Project: Apache Arrow
> Issue Type: New Feature
> Components: C++
> Reporter: Ben Kietzman
> Priority: Minor
> Labels: good-second-issue
>
> Fields appear consistently ordered in most JSON data in the wild, but the
> JSON parser currently looks fields up in a hash table. The ordering can
> probably be exploited to yield better performance when looking up field
> indices
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