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https://issues.apache.org/jira/browse/IMPALA-7748?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Thomas Tauber-Marshall resolved IMPALA-7748.
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Resolution: Not A Problem
After further discussion, we've decided t leave appx_count_distinct as is
> Remove the appx_count_distinct query option
> -------------------------------------------
>
> Key: IMPALA-7748
> URL: https://issues.apache.org/jira/browse/IMPALA-7748
> Project: IMPALA
> Issue Type: Improvement
> Affects Versions: Impala 3.1.0
> Reporter: Thomas Tauber-Marshall
> Priority: Minor
>
> With IMPALA-110, we can now support multiple count distinct directly, and the
> appx_count_distinct query option is no longer needed. Users who want the perf
> improvement from it can always just use the ndv() function directly in their
> sql.
> We'll mark this option as deprecated in the docs starting from 3.1. Removing
> it can be targeted for 4.0
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