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https://issues.apache.org/jira/browse/CALCITE-5464?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17680341#comment-17680341
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Tanner Clary commented on CALCITE-5464:
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I added a second commit to the linked PR to address the issue I was previously
having with the 'WEEK' time unit. Calcite considers a week to be 7 days while
BigQuery anchors the beginning of a week to Sunday. This means, for instance,
that if you had one date on a Saturday and the second date is the next day on
Sunday, BigQuery would say they are a week apart despite only being a day
apart. The second commit addresses this difference by truncating each date to
the most recent Sunday so the proper answer is returned. Any
comments/questions/feedback are appreciated! Thanks.
> Implement BigQuery DATE_ADD/DATE_DIFF
> -------------------------------------
>
> Key: CALCITE-5464
> URL: https://issues.apache.org/jira/browse/CALCITE-5464
> Project: Calcite
> Issue Type: Sub-task
> Reporter: Tanner Clary
> Assignee: Tanner Clary
> Priority: Major
> Labels: pull-request-available
> Time Spent: 10m
> Remaining Estimate: 0h
>
> Add support for BigQuery DATE_ADD/DATE_DIFF functions.
> {{DATE_ADD(date_expression, interval)}} adds the interval to the date
> expression.
> Example: {{DATE_ADD(DATE '2008-12-25', INTERVAL 3 DAY)}} would return
> '2008-12-28'.
> [BigQuery
> docs|https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions#date_add]
> {{DATE_DIFF(date_expression, date_expression2, time_unit)}} returns the whole
> number of time_unit between the first and second date expressions, with the
> result being negative if the first date is earlier than the second.
> Example: {{DATE_DIFF(DATE '2008-12-25', DATE '2008-12-28', DAY)}} would
> return -3.
> [BigQuery
> docs|https://cloud.google.com/bigquery/docs/reference/standard-sql/date_functions#date_diff]
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