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https://issues.apache.org/jira/browse/CALCITE-6021?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17768133#comment-17768133
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Tanner Clary commented on CALCITE-6021:
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[~julianhyde] Sorry I may have highlighted the wrong test, even when the
conformance and library are both set for BigQuery, it does not allow the
function to work with parentheses. It throws the error: {{Column
'CURRENT_DATETIME' not found in any table}} . I will look more into
{{SqlSyntax.FUNCTION_ID}}, though.
> Add CURRENT_DATETIME function (enabled in BigQuery library)
> -----------------------------------------------------------
>
> Key: CALCITE-6021
> URL: https://issues.apache.org/jira/browse/CALCITE-6021
> Project: Calcite
> Issue Type: Bug
> Reporter: Tanner Clary
> Priority: Major
>
> Calcite supports parsing and validation for the CURRENT_DATETIME function
> according to CALCITE-4297 . However a native implementation was never added.
> The docs for the function may be found here:
>
> https://cloud.google.com/bigquery/docs/reference/standard-sql/datetime_functions#current_datetime
> An example:
> {{SELECT CURRENT_DATETIME([timezone])}} should return the current time as a
> {{DATETIME}} (a Calcite TIMESTAMP). There is an optional time zone argument.
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