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https://issues.apache.org/jira/browse/SOLR-15185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17295564#comment-17295564
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Joel Bernstein commented on SOLR-15185:
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The *parallel* Streaming Expression is what is using this currently.
> Improve "hash" QParser
> ----------------------
>
> Key: SOLR-15185
> URL: https://issues.apache.org/jira/browse/SOLR-15185
> Project: Solr
> Issue Type: Improvement
> Reporter: David Smiley
> Assignee: David Smiley
> Priority: Major
> Time Spent: 50m
> Remaining Estimate: 0h
>
> * Don't use Filter (to be removed)
> * Do use TwoPhaseIterator, not PostFilter
> * Don't pre-compute matching docs (wasteful)
> * Support more fields, and more field types
> * Faster hash on Strings (avoid Char conversion)
> * Stronger hash when using multiple fields
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