Could not locate a suitable specification about the maximum character limit for a Hive Table.
I am developing an ETL process involving hive tables that have specified naming conventions with the format _ and the table names provided are quite larger than 30 byte (normal limit for pl/sql), a straight google search lands me with column name limit but no info on tablename.
Apache Hive is Open Source. In Source Code Veritas.
With branch 2.1 for instance, the Javadoc and the Java source for "Metastore API" -- as well as the Thrift message format -- manage table names as generic Strings. No specific limit there.
But the Metastore service uses a RDBMS as back-end, and you can see that the standard MySQL schema defines
CREATE TABLE IF NOT EXISTS `TBLS` (
...
`TBL_NAME` varchar(128) CHARACTER SET latin1 COLLATE latin1_bin DEFAULT NULL,
...
Note that this 128-char-in-Latin-alphabet limit is the default when setting up Hive. A plain ALTER TABLE command afterwards would be sufficient to change that limit at database level, without having to recompile anything.