Max Gekk created SPARK-51554:
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Summary: Add time_trunc() function
Key: SPARK-51554
URL: https://issues.apache.org/jira/browse/SPARK-51554
Project: Spark
Issue Type: Sub-task
Components: SQL
Affects Versions: 4.1.0
Reporter: Max Gekk
The time_trunc() function returns time truncated to the unit specified in unit.
h4. Syntax
{code:sql}
time_trunc(unit, expr)
{code}
h4. Arguments
* unit: A STRING literal.
* expr: A TIME, or STRING with a valid time format.
h4.
A TIME(n) with n matching that of expr.
h4. Notes
Valid units for unit are (case-insensitive):
* 'HOUR': zero out the minute and second with fraction part
* 'MINUTE': zero out the second with fraction part
* 'SECOND': zero out the second fraction part
* 'MILLISECOND': zero out the microseconds
* 'MICROSECOND': everything remains
If the unit is not well-formed the function returns NULL.
h4. Examples
{code:sql}
> SELECT time_trunc('HOUR', '09:32:05.359');
09:00:00
> SELECT time_trunc('MILLISECOND', '09:32:05.123456');
09:32:05.123
-- Not a recognised unit
> SELECT time_trunc('MS', '09:32:05.123456');
NULL
{code}
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