Abstract: Techniques for implementing a low-latency query processor accommodating an arbitrary number of data rows with no column indexing. In an aspect, data is stored across a plurality of component databases, with no requirement to strictly allocate data to partitions based on row keys. A histogram table is provided to map object relationships identified in a user query to the component databases where relevant data is stored. A server processing the user query communicates with component databases via an intermediary module. The intermediary module may include intermediary nodes dynamically assigned to connect to the component databases to retrieve and process the queried data.