Fix concurrent exceptions due to Map in FlowResultImpl #1118
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Please check if the PR fulfills these requirements
Does this PR already have an issue describing the problem?
No
What kind of change does this PR introduce?
Bug fix
What is the current behavior?
An exception was sometimes thrown by FlowResultImpl when getting a result from the memoization map.
What is the new behavior (if this is a feature change)?
The HashMap has been replaced by a ConcurrentHashMap.
Does this PR introduce a breaking change or deprecate an API?