[jira] [Created] (CALCITE-5446) Support TIMESTAMP WITH LOCAL TIME ZONE type in JDBC driver

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

Julian Hyde created CALCITE-5446:
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             Summary: Support TIMESTAMP WITH LOCAL TIME ZONE type in JDBC driver
                 Key: CALCITE-5446
                 URL: https://issues.apache.org/jira/browse/CALCITE-5446
             Project: Calcite
          Issue Type: Bug
            Reporter: Julian Hyde


Support TIMESTAMP WITH LOCAL TIME ZONE type in JDBC driver.

Currently, Calcite types with {{SqlTypeName.TIMESTAMP_WITH_LOCAL_TIME_ZONE}} are mapped to JDBC type 1111 (OTHER). As a result, the ResultSet.toString() method just converts the (signed) {{long}} value to a string.

Here is what [Progress|https://docs.progress.com/en-US/bundle/datadirect-connect-jdbc-51/page/TIMESTAMP-WITH-LOCAL-TIME-ZONE-Data-Type.html] says:

{quote}
The Oracle {{TIMESTAMP WITH LOCAL TIME ZONE}} data type is mapped to the JDBC {{TIMESTAMP}} data type.

When retrieving {{TIMESTAMP WITH LOCAL TIME ZONE}} columns, the value returned to the user is converted to the time zone specified by the {{TIME_ZONE}} session parameter.

When setting {{TIMESTAMP WITH LOCAL TIME ZONE}} columns:
* Using a timestamp (using {{PreparedStatement.setTimestamp}}, for example), the value set is converted to the time zone specified by the {{TIME_ZONE}} session parameter.
* Using a string (using {{PreparedStatement.setString()}}, for example), the string is passed as-is to the server. The supplied string must be in the format specified by the {{NLS_TIMESTAMP_TZ_FORMAT}} session parameter. If not, the Oracle server generates an error when it attempts to convert the string to the {{TIMESTAMP WITH LOCAL TIME ZONE}} type.
{quote}

We should definitely map to {{java.sql.Types.TIMESTAMP}}.

I'm not sure whether Calcite has a {{TIME_ZONE}} session parameter. But values should be shifted from/to the desired time zone on the way in/out.

And maybe there should also be a Calcite server time zone that is the time zone in which {{TIMESTAMP WITH LOCAL TIME ZONE}} values are represented. By default this should be UTC, and using a time zone with a variable offset from UTC (e.g. "Pacific/Los_Angeles") would be a bad idea.



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