US Patent 9189515 Data retrieval from heterogeneous storage systems

Techniques are described for retrieving data stored in disparate datastores that support different or heterogeneous storage systems. A report description may be received from a user, the report description including multiple query templates for generating queries to retrieve data from the disparate datastores. The report description may be analyzed to determine input parameters for generating the queries. A user interface may be dynamically generated to solicit input values corresponding to the input parameters. On receiving the input values, the system may generate and execute the queries of the query plan, and combine the results based on result combination information included in the report description.