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## What changes were proposed in this pull request? Adding date_trunc() as a built-in function. `date_trunc` is common in other databases, but Spark or Hive does not have support for this. `date_trunc` is commonly used by data scientists and business intelligence application such as Superset (https://github.com/apache/incubator-superset). We do have `trunc` but this only works with 'MONTH' and 'YEAR' level on the DateType input. date_trunc() in other databases: AWS Redshift: http://docs.aws.amazon.com/redshift/latest/dg/r_DATE_TRUNC.html PostgreSQL: https://www.postgresql.org/docs/9.1/static/functions-datetime.html Presto: https://prestodb.io/docs/current/functions/datetime.html ## How was this patch tested? Unit tests (Please explain how this patch was tested. E.g. unit tests, integration tests, manual tests) (If this patch involves UI changes, please attach a screenshot; otherwise, remove this) Please review http://spark.apache.org/contributing.html before opening a pull request. Author: Youngbin Kim <ykim828@hotmail.com> Closes #20015 from youngbink/date_trunc. |
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