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https://issues.apache.org/jira/browse/CALCITE-6879?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17933704#comment-17933704
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Yu Xu commented on CALCITE-6879:
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Hi [~asolimando] , I had addressed comments in PR, could you help to review
again, thanks~
> Dialect support APPROX_DISTINCT_COUNT for more dialects
> -------------------------------------------------------
>
> Key: CALCITE-6879
> URL: https://issues.apache.org/jira/browse/CALCITE-6879
> Project: Calcite
> Issue Type: Improvement
> Components: core
> Affects Versions: 1.38.0
> Reporter: Yu Xu
> Priority: Major
> Labels: pull-request-available
> Fix For: 1.39.0
>
>
> Currently Phoenix/MSS support APPROX_DISTINCT_COUNT syntax and Clickhouse can
> archive approx distinct count by UNIQ syntax, need to support it in Calcite
> dialect.
> Phoenix：[https://phoenix.apache.org/language/functions.html#approx_count_distinct]
> MSS：[https://learn.microsoft.com/zh-cn/sql/t-sql/functions/approx-count-distinct-transact-sql]
> ClickHouse({*}uniq{*}: Calculates the approximate number of different values
> of the argument.):
> [https://clickhouse.com/docs/sql-reference/aggregate-functions/reference/uniq]
>
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