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https://issues.apache.org/jira/browse/CALCITE-5447?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17649530#comment-17649530
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Zou commented on CALCITE-5447:
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Hi [~oliverlee], I'd like to take this.
> Add DATE_TRUNC for BigQuery
> ---------------------------
>
> Key: CALCITE-5447
> URL: https://issues.apache.org/jira/browse/CALCITE-5447
> Project: Calcite
> Issue Type: Improvement
> Reporter: Oliver Lee
> Priority: Minor
>
> Adding in BigQuery's definition of DATE_TRUNC as described
> [https://g3doc.corp.google.com/company/teams/googlesql/reference/date_functions.md?cl=head#date-trunc]
>
> ex.
> DATE_TRUNC('2022-01-05', month) -> 2022-01-01
> DATE_TRUNC('2022-01-05', day) -> 2022-01-05
> DATE_TRUNC('2022-01-05', year) -> 2022-01-01
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