...
| Plain FROM | Simple COUNT | Simple WHERE | Primary key lookup | Groups and aggregates | |
|---|---|---|---|---|---|
| CSV |  Streaming |
|  Client-side | No PK |  Greedy |
| JDBC | Streaming | Native (all variants) | Native | Native | Native |
Excel |
| Native | Client-side | No PK | Greedy |
| POJO | In memory | Native | Client-side | No PK | Greedy |
| Apache CouchDB | Streaming | Native | Native | Native | Greedy |
| MongoDB | Streaming | Native | Native | Native | Greedy |
| ElasticSearch | Paged | Native | Native | Native | Greedy |
| Apache HBase | Streaming | Native | Client-side | Native | Greedy |
| Apache Cassandra | Paged | Native | Client-side | Native | Greedy |
| Apache Kafka | Streaming | Greedy |
| Greedy | Greedy |
| Amazon DynamoDB | Paged | Native | Client-side | Native | Greedy |
| JSON | Streaming | Greedy | Client-side | No PK | Greedy |
| XML |
| Greedy | Client-side | Greedy | Greedy |
| Salesforce.com | Paged | Native | Native | Native | Greedy |
| SugarCRM | Paged | Native | Native | Greedy | Greedy |
...