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https://issues.apache.org/jira/browse/SPARK-54630?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vinod KC updated SPARK-54630:
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Summary: Add timestamp_bucket function for temporal bucketing with
configurable alignment (was: Add date_bucket function for arbitrary interval
bucketing of dates)
> Add timestamp_bucket function for temporal bucketing with configurable
> alignment
> --------------------------------------------------------------------------------
>
> Key: SPARK-54630
> URL: https://issues.apache.org/jira/browse/SPARK-54630
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 3.5.0, 4.0.0
> Reporter: Vinod KC
> Priority: Major
> Labels: pull-request-available
>
>
> Add {{date_bucket}} function to bucket DATE values into arbitrary
> fixed-duration intervals aligned to the Unix epoch (1970-01-01)
>
> Currently, Spark provides:
> * {*}{{date_trunc()}}{*}: Truncates to calendar-based units (year, quarter,
> month, week, day) but only supports predefined units
> * {*}{{window()}}{*}: For TIMESTAMP bucketing with tumbling/sliding windows,
> returns a struct with start/end times
> However, there is no function to bucket dates by arbitrary fixed durations
> like:
> * 7-day buckets (weekly reporting aligned to epoch, not calendar weeks)
> * 14-day buckets (bi-weekly cycles)
> * Custom N-day intervals for business cycles
> This is a common requirement for:
> * {*}Time-series analytics{*}: Grouping events by custom time periods
> * {*}Reporting{*}: Creating consistent bucketing across different date ranges
> * {*}Data partitioning{*}: Organizing data by fixed-duration intervals
>
> {code:java}
> -- 7-day buckets
> SELECT date_bucket(INTERVAL '7' DAY, DATE'2025-01-15');
> -- Result: 2025-01-09
> -- 2 WEEKS = 14 days
> SELECT date_bucket(INTERVAL '2' WEEK, DATE'2025-01-15');
> -- Result: 2025-01-02
> -- Group orders by 7-day buckets
> SELECT date_bucket(INTERVAL '7' DAY, order_date) AS week_bucket,
> COUNT(*) AS order_count,
> SUM(amount) AS total_sales
> FROM orders
> WHERE order_date >= DATE'2025-01-01'
> GROUP BY week_bucket
> ORDER BY week_bucket;
> -- Demonstrate date_bucket with Multiple Input Dates
> SELECT stack(8,
> DATE'2025-01-01', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-01'),
> DATE'2025-01-05', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-05'),
> DATE'2025-01-08', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-08'),
> DATE'2025-01-15', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-15'),
> DATE'2025-01-14', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-14'),
> DATE'2025-01-13', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-13'),
> DATE'2025-01-22', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-22'),
> DATE'2025-01-29', date_bucket(INTERVAL '1' WEEK, DATE'2025-01-29')
> ) AS (input_date, bucket_start)
> 2025-01-01 2024-12-26
> 2025-01-05 2025-01-02
> 2025-01-08 2025-01-02
> 2025-01-15 2025-01-09
> 2025-01-14 2025-01-09
> 2025-01-13 2025-01-09
> 2025-01-22 2025-01-16
> 2025-01-29 2025-01-23{code}
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