public static String getFullTableName(String dbName, String tableName) {
    return TableName.fromString(tableName, null, dbName).getNotEmptyDbTable().toLowerCase();
  }
Returns ValidWriteIdList for the table with the given "dbName" and "tableName".
This is called when HiveConf has no list for the table.
Otherwise use getTableSnapshot().
@param conf       Configuration
@param dbName
@param tableName
@return ValidWriteIdList on success, null on failure to get a list.
@throws LockException
ql/src/java/org/apache/hadoop/hive/ql/io/AcidUtils.java