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https://issues.apache.org/jira/browse/ARROW-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Brian Hulette resolved ARROW-2144.
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Resolution: Fixed
Fix Version/s: JS-0.3.0
Issue resolved by pull request 1599
[https://github.com/apache/arrow/pull/1599]
> [JS] Don't repeat dictionary lookups in DataFrame ops
> -----------------------------------------------------
>
> Key: ARROW-2144
> URL: https://issues.apache.org/jira/browse/ARROW-2144
> Project: Apache Arrow
> Issue Type: Improvement
> Components: JavaScript
> Reporter: Brian Hulette
> Priority: Major
> Labels: pull-request-available
> Fix For: JS-0.3.0
>
>
> Currently we repeat dictionary lookups every time we bind a new record batch
> when doing an equality check in a DataFrame op
> (https://github.com/apache/arrow/blob/master/js/src/predicate.ts#L143).
> In most cases the dictionary won't be changing between record batches, so we
> should remember these reverse dictionary lookups, either permanently, or at
> least for the duration of the current operation.
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