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https://issues.apache.org/jira/browse/CALCITE-5269?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17604972#comment-17604972
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Julian Hyde commented on CALCITE-5269:
--------------------------------------
As we discussed offline, these functions will need parser changes, and should
be added to the core parser, but should only be enabled if
{{{}fun=bigquery{}}}. The precedent for this is the {{RLIKE}} operator, added
in CALCITE-3574.
> Implement BigQuery DATE/TIMESTAMP_TRUNC functions
> -------------------------------------------------
>
> Key: CALCITE-5269
> URL: https://issues.apache.org/jira/browse/CALCITE-5269
> Project: Calcite
> Issue Type: Sub-task
> Reporter: TJ Banghart
> Assignee: TJ Banghart
> Priority: Major
>
> Implement missing BigQuery functions for:
> * DATE_TRUNC
> * DATETIME_TRUNC
> * TIME_TRUNC
> * TIMESTAMP_TRUNC
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