[jira] [Commented] (CALCITE-5564) Add parsing and validation for PERCENTILE_CONT/PERCENTILE_DISC functions (enabled in BigQuery)

["Tanner Clary (Jira)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/CALCITE-5564?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17727546#comment-17727546 ] 

Tanner Clary commented on CALCITE-5564:
---------------------------------------

[~julianhyde] I responded to your most recent comments on the PR. Feel free to take a look, thanks.

> Add parsing and validation for PERCENTILE_CONT/PERCENTILE_DISC functions (enabled in BigQuery)
> ----------------------------------------------------------------------------------------------
>
>                 Key: CALCITE-5564
>                 URL: https://issues.apache.org/jira/browse/CALCITE-5564
>             Project: Calcite
>          Issue Type: Improvement
>            Reporter: Tanner Clary
>            Assignee: Tanner Clary
>            Priority: Major
>              Labels: pull-request-available
>
> Calcite currently has implementations for the {{PERCENTILE_CONT}} and {{PERCENTILE_DISC}} functions. Their syntax may be found [here|https://learn.microsoft.com/en-us/sql/t-sql/functions/percentile-cont-transact-sql?view=sql-server-ver16]. 
> BigQuery offers these functions as well, but the syntax is slightly different, and may be found [here|https://cloud.google.com/bigquery/docs/reference/standard-sql/functions-and-operators#percentile_cont]. The main difference is that instead of using a {{WITHIN GROUP}} clause, the array is passed in directly as the first argument to the function.
> BigQuery Syntax Example: {{SELECT PERCENTILE_CONT(x, .5) OVER() FROM UNNEST([1,2,3,4]) as x;}} would return the median, 2.5.
> Standard Syntax Example: {{SELECT PERCENTILE_CONT(.5) WITHIN GROUP (ORDER BY [some column])}}
> Parsing and validation for the standard functions was added in CALCITE-4644.
> The actual implementation for both the standard and BigQuery forms is covered under CALCITE-4666.



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