Investigate support of Java8 java.time* classes

[tomuben]

Background

The implementation of the java.sql.Timestamp causes some confusion today, because this class might contain a timezone (extends java.util.Date). The timezone is implicitly set in the udf client and depends of the timezone set on the DB node.

The Java 8 java.time.Instant and java.time.LocalDateTime come without a timezone and would match the Exasol DB TIMESTAMP type. java.time.ZonedDateTime would be the best match for Exasol DATE.

Acceptance Criteria

Investigate and implement support for

• java.time.Instant
• java.time.ZoneDateTime
• java.time.LocalDateTime

[tomuben]

[tomuben]

1. Also need to investigate if we should change behavior of old classes. This would mean a breaking change for customers.
2. Need to involve core-db here. We would need to pass the TZ info to the UDF client from the Database.