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https://issues.apache.org/jira/browse/CALCITE-4997?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17486632#comment-17486632
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Julian Hyde commented on CALCITE-4997:
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Can you update the Jira to make it clear which component is doing this.
After your fix it seems that we generate APPROX_COUNT_DISTINCT on all dialects.
Can you add a test for a dialect that does not have that function.
> approx_count_distinct function was incorrectly converted to count(distinct )
> ----------------------------------------------------------------------------
>
> 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
>
> {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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