Fix threes bugs of timestampv2 precision: 1. Hive catalog doesn't set the precision of timestampv2, and can't get the precision from hive metastore, so set the largest precision for timestampv2; 2. Jdbc catalog use datetimev1 to parse timestamp, and convert to timestampv2, so the precision is lost. 3. TVF doesn't use the precision from meta data of file format.