Methods and systems for performing cross store joins in a multi-tenant store

A non-transitory computer readable storage medium having instructions stored thereon that, when executed by processor in a host system, perform a method comprising:

• receiving a request specifying data to be retrieved from a multi-tenant database system;
• retrieving based on the request, one or more locations of the data to be retrieved;
• generating a database query based on the request, wherein the database query specifies a plurality of data elements to be retrieved, the plurality of data elements including one or more data elements residing within a non-relational data store of the multi-tenant database system and one or more other data elements residing within a relational data store of the multi-tenant database system;
• and
• executing the database query against the multi-tenant database system to retrieve the data.

A system comprising:

• a processor and a memory;
• a communications interface to a multi-tenant database system having a relational data store and a non-relational data store implemented therein;
• a request processor to receive a request specifying data to be retrieved from the multi-tenant database system;
• a customer schema processor to retrieve, based on the request, one or more locations of the data to be retrieved;
• a sub-query generator to generate a database query based on the request, wherein the database query specifies a plurality of data elements to be retrieved, the plurality of data elements including one or more data elements residing within the non-relational data store of the multi-tenant database system and one or more other data elements residing within the relational data store of the multi-tenant database system;
• and
• a query executor to execute the database query against the multi-tenant database system to retrieve the data.