Hm. To be honest I don't understand your "cumulate" model, but idea is not
like Groovy inject function.
What I need:
One task (let us call it 'task reader') to iterate over some query and
create new analysis task ('task analyzer') for each data set. Third join
task ('finish task') should be called when every task 'analyzer' is
finished with grouped data, but only if task 'reader' has finished its
reading role and iterated to the end of query. And I want tasks 'analyzer'
to be executed in parallel with task 'reader'.
Matija.
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