Provide a syntax to indicate an external function should execute on all nodes.

If you have a function that returns a streamed dataset it will only be executed on the 1st node. We need a syntax that will execute it on all the nodes in parallel.

Suggestions:

• ALLNODES(<call>) - would have a confusing meaning in roxie, we don't want it run on all roxie slaves (or do we?!)

• DATASET(<call>, LOCAL|DISTRIBUTED) ?

• Something else? Any suggestions?

A requirement for allowing 3rd party distributed file readers to be written as plugins (e.g., to read amazon s3).