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https://issues.apache.org/jira/browse/ARROW-2144?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17659172#comment-17659172
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Rok Mihevc commented on ARROW-2144:
-----------------------------------
This issue has been migrated to [issue
#18111|https://github.com/apache/arrow/issues/18111] on GitHub. Please see the
[migration documentation|https://github.com/apache/arrow/issues/14542] for
further details.
> [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
> Assignee: 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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