Andrei Sereda created CALCITE-2797:
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Summary: 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
Assignee: Julian Hyde
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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