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RegionFunctionContext should provide the local data set

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RegionFunctionContext should just provide a getLocalDataSet method. We will add this new method to the RegionFunctionContext interface. We will deprecate the PartitionRegionHelper.getLocalDataForContext.

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Functions executed on a region should implement a different interface

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We will add isHA(boolean), hasResult(Boolean) and optimizeForWrite(boolean) to the Execution interface. These methods will be deprecated on the function interface. Unfortunately, if someone invokes a function on a client given the string id, we will still need to look up the function class for now in case they have specified these parameters on their function. But in another release we can remove the deprecated parameters and stop using them.

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The Function interface should return a value

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