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Posted to issues@calcite.apache.org by "xiejiajun (Jira)" <ji...@apache.org> on 2022/02/04 07:55:00 UTC

[jira] [Updated] (CALCITE-4997) Keep APPROX_COUNT_DISTINCT in some SqlDialects

     [ https://issues.apache.org/jira/browse/CALCITE-4997?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

xiejiajun updated CALCITE-4997:
-------------------------------
    Summary: Keep APPROX_COUNT_DISTINCT in some SqlDialects  (was: approx_count_distinct function was incorrectly converted to count(distinct ))

> Keep APPROX_COUNT_DISTINCT in some SqlDialects
> ----------------------------------------------
>
>                 Key: CALCITE-4997
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4997
>             Project: Calcite
>          Issue Type: Bug
>          Components: core
>    Affects Versions: 1.29.0
>            Reporter: xiejiajun
>            Priority: Major
>              Labels: pull-request-available
>          Time Spent: 20m
>  Remaining Estimate: 0h
>
> {code:java}
> SELECT APPROX_COUNT_DISTINCT(product_id)
> FROM foodmart.product
> {code}
> will be
> {code:java}
> SELECT COUNT(DISTINCT product_id)
> FROM foodmart.product
> {code}
> This can cause many tasks to run too slowly.



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