mistral/releasenotes/notes/workflow_environment_optimi...

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fixes:
- Mistral was storing, in fact, two copies of a workflow environment,
one in workflow parameters (the 'params' field) and another one in
a context (the 'context' field). Now it's stored only in workflow
parameters. It saves space in DB and increases performance in case
of big workflow environments.
- Mistral was copying a workflow environment into all of their sub
workflows. In case of a big workflow environment and a big number
of sub workflows it caused serious problems, used additional space
in DB and used a lot of RAM (e.g. when the 'on-success' clause has
a lot of tasks where each one of them is a subworkflow). Now it is
fixed by evaluating a workflow environment through the root execution
reference.