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https://issues.apache.org/jira/browse/SOLR-17122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18139769#comment-18139769
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Gaël Jourdan commented on SOLR-17122:
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>From my experience `unique` does not work in multi shards indexes, `hll` has
>to be used.
> Solr Unique, HLL, numBuckets returns incorrect counts
> -----------------------------------------------------
>
> Key: SOLR-17122
> URL: https://issues.apache.org/jira/browse/SOLR-17122
> Project: Solr
> Issue Type: Bug
> Affects Versions: 9.4
> Reporter: Kevin Van Lieshout
> Priority: Critical
>
> We are running Solr 9.4. My colleague and I are using the unique function and
> hll function in order to obtain a count of ip addresses from a text general
> field so we know how many ip's there are in a query, etc. Same goes with us
> testing on a pdouble field. We are seeing incorrect counts for three
> different methods in obtaining this value when there are a lot of unique
> values and a lot of documents. These methods are using:
>
> # unique(field)
> # hll(field)
> # Setting numBuckets: True
>
> {'query': 'field:value', 'filter': [], 'facet': \{'first_facet':
> {unique(field_a)}}
> or
> or \{'query': 'field:value', 'filter': [], 'facet': {'first_facet':
> {hll(field_a)}}
> or
> {'query': 'field:value', 'filter': [], 'facet': \{'first_facet': {'type':
> 'terms', 'field': 'field_a', 'limit': 0, 'numBuckets': True}}}
>
> I am wondering if this is the correct functionality and it being a limit of
> solr's ability but it's not great for us to show approximations in our
> application and we are wondering if we are using this incorrectly or this is
> what to expect at high cardinality and a large number of documents. Thank you
> much.
>
>
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