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While support for TIMESTAMP columns in Kudu tables has been committed (IMPALA-5137), it does not support TIMESTAMP column default values. This supports CREATE TABLE syntax to specify the default values, but more importantly this fixes the loading of Kudu tables that may have had default values set on UNIXTIME_MICROS columns, e.g. if the table was created via the python client. This involves fixing KuduColumn to hide the LiteralExpr representing the default value because it will be a BIGINT if the column type is TIMESTAMP. It is only needed to call toSql() and toStringValue(), so helper functions are added to KuduColumn to encapsulate special logic for TIMESTAMP. TODO: Add support and tests for ALTER setting the default value (when IMPALA-4622 is committed). Change-Id: I655910fb4805bb204a999627fa9f68e43ea8aaf2 Reviewed-on: http://gerrit.cloudera.org:8080/6936 Reviewed-by: Matthew Jacobs <mj@cloudera.com> Tested-by: Impala Public Jenkins