it seems he means to query RDBMS or cassandra using Spark SQL, multi data
sources for spark SQL.

i looked through the link he posted
https://docs.wso2.com/display/BAM241/Creating+Hive+Queries+to+Analyze+Data#CreatingHiveQueriestoAnalyzeData-CreatingHivetablesforvariousdatasources

using their storage handlers, users can create hive external table from c*
table or RDBMS table (JDBC)

so Niranda, maybe you can take a look at this API:
https://issues.apache.org/jira/browse/SPARK-2179
and there is some doc in pull request pool:
https://github.com/apache/spark/pull/1774

there is a similar implementation to your JDBC "storage handlers" in spark
SQL, it could also be a sample of the Public API for DataTypes and Schema:
https://github.com/apache/spark/pull/1612
(https://issues.apache.org/jira/browse/SPARK-2710)

and, in some other userlist threads, i saw that, some kind of c* mapper is
also in development by datastax?



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