[jira] [Created] (CALCITE-5290) Add DATE_TRUNC function consistent with Postgres

["Julian Hyde (Jira)" <ji...@apache.org>]

Julian Hyde created CALCITE-5290:
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             Summary: Add DATE_TRUNC function consistent with Postgres
                 Key: CALCITE-5290
                 URL: https://issues.apache.org/jira/browse/CALCITE-5290
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde


Add {{DATE_TRUNC}} function consistent with Postgres. Per the [specification|https://www.postgresql.org/docs/current/functions-datetime.html#FUNCTIONS-DATETIME-TRUNC], syntax is as follows:

{code}
DATE_TRUNC(<string>, <timestamp | date | time>)
{code}

It is a different (and more complex) specification than BigQuery's DATE_TRUNC (see CALCITE-5180), which has the following syntax:

{code}
DATE_TRUNC(<date>, <interval>)
{code}

Postgres DATE_TRUNC would be implemented after CALCITE-5155 and would allow user-defined time frames in the {{field}} argument.



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