[jira] [Created] (FLINK-12844) Use default conversion class LocalDate/LocalTime/LocalDateTime for DateType/TimeType/TimestampType in blink

[Shang Yuanchun (Jira)]

Jingsong Lee created FLINK-12844:
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             Summary: Use default conversion class LocalDate/LocalTime/LocalDateTime for DateType/TimeType/TimestampType in blink
                 Key: FLINK-12844
                 URL: https://issues.apache.org/jira/browse/FLINK-12844
             Project: Flink
          Issue Type: Improvement
          Components: Table SQL / Planner
            Reporter: Jingsong Lee
            Assignee: Jingsong Lee


Now we still use java.sql.Timestamp to be default conversion class for TimestampType.

We should use design of new Type System to use java.time.Local***.

NOTE, This may affect user behaviour:

eg: UDF with eval(Object o), now will pass a java.time.Local*** instead of java.sql.**.

Compatibility method: use DataType.bridgedTo(java.sql.**.class);



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