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https://issues.apache.org/jira/browse/CALCITE-5955?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17772373#comment-17772373
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Oliver Lee commented on CALCITE-5955:
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Sorry I think I'm getting sidetracked with the complex case.
Here is the state of Calcite and what we would like to happen
||query name||ISO SQL ||ISO SQL Supported in Calcite?||ideal BQ translated SQL||
|input_1|select percentile_cont(0.5) within group (order by X)|Yes|select
percentile_cont(0.5) over (order by x)|
|input_2|select percentile_cont(0.5) within group (order by X) over (partition
by y)|No|select percentile_cont(0.5) over (partition by y order by X)|
| | | | |
| | | | |
To handle the simple case {{input_1}} , I will create a JIRA case for that and
have a commit up.
{{input_2}} in its ISO SQL form is not supported by Calcite so I will log 2
tickets, 1 to support it in Calcite and then 1 to do the BQ translation.
> BigQuery PERCENTILE functions are unparsed incorrectly
> ------------------------------------------------------
>
> Key: CALCITE-5955
> URL: https://issues.apache.org/jira/browse/CALCITE-5955
> Project: Calcite
> Issue Type: Bug
> Reporter: Tanner Clary
> Assignee: Tanner Clary
> Priority: Major
> Labels: pull-request-available
>
> Currently if you have a query like:
> {{SELECT PERCENTILE_CONT(x, .5) OVER() FROM x;}} the {{OVER()}} clause gets
> unparsed with a {{window frame clause}} which BigQuery defines
> [here|https://cloud.google.com/bigquery/docs/reference/standard-sql/window-function-calls#def_window_frame].
>
> From the docs: "Only aggregate analytic functions can use a window frame
> clause."
> This causes BigQuery to fail with the following error: {{Window framing
> clause is not allowed for analytic function percentile_cont}}
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