See how different cases of the JoinStream element migrate from AleriML to CCL.
Aleri Streaming Platform | Event Stream Processor |
---|---|
Supports inner joins only when joining insert-only streams. | No restrictions on inner joins. |
Does not support MANY-MANY. | Supports MANY-MANY. |
Supports specifying retention indirectly. Create a CopyStream with retention from the join source. Use this copy as the source for the join. | Supports specifying retention directly on the join sources for memory stores only. Note: For log stores, create a retention on the copy of the join source. Use this copy as the source for the join.
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Join streams run in a single thread only. | Multiple threads can be created depending on the complexity and type of the join. |
Does not support joining a stream (stateless store element) with a window (memory store or log store element). | Supports joining a stream (stateless store element) with a window. This join is performed when a record arrives on a stream, so that the stream acts as a trigger for the join. |
Does not support deducing primary keys. | The primary key can be deduced. |
Does not support specifying multiple operations in single statement. Each operation must be defined separately. | Supports specifying joins, filters, and aggregates in a single statement. The compiler breaks this into multiple threads. |