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https://issues.apache.org/jira/browse/CALCITE-2797?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Andrei Sereda resolved CALCITE-2797.
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Resolution: Fixed
> Support APPROX_COUNT_DISTINCT aggregate function in ElasticSearch
> -----------------------------------------------------------------
>
> Key: CALCITE-2797
> URL: https://issues.apache.org/jira/browse/CALCITE-2797
> Project: Calcite
> Issue Type: Improvement
> Components: elasticsearch-adapter
> Reporter: Andrei Sereda
> Priority: Major
> Fix For: 1.19.0
>
>
> Use native elastic
> [cardinality|https://www.elastic.co/guide/en/elasticsearch/reference/current/search-aggregations-metrics-cardinality-aggregation.html]
> aggregation for {{APPROX_COUNT_DISTINCT}}
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