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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