code: private String getDbTableName(String schemaName) {
      Preconditions.checkArgument(schemaName.matches(".+_.+_.+"));
      return schemaName.replaceFirst("_", ".").substring(0, schemaName.lastIndexOf('_'));
    }
docs: Translate schema name to "dbname.tablename" to use in path
  
  @param schemaName In format "dbname_tablename_xxxxx"
  @return db and table name in format "dbname.tablename"