How to query a reporting data source using ranges?

HI guys,
I was looking at the BPM Reporting API available and more specifically the way one can query and search for data, stored in a reporting Data Source.
I can see that there are methods in the API, allowing for a search by concrete field name and value, triggering data with exact or partial match of the specified value (query() and search() methods of ReportingDataSourceManager interface).
However, we need to query using ranges of numbers or dates. Can someone advice how this can be done without creating a method of our own processing the whole data set?
For example, how I can retrieve all data stored since yesterday? am I missing something in the BPM Reporting API? Any suggestions will be much appreciated.
Kind Regards,
Mariya Stancheva

i think you have to do it by your own code.

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