how to set database name when write dataframe into carbondata

[lk_hadoop]

hi,all:
    I want to write a dataframe to carbondata, but I can only write to 
'default' schema , how can I change it , my code :

    df.write.format("org.apache.spark.sql.CarbonSource").option("tableName", 
s"${tables(i)}").mode(SaveMode.Append).save

2017-08-25


lk_hadoop