THIS IS A TEST INSTANCE. ALL YOUR CHANGES WILL BE LOST!!!!
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The issue with Approach1 is that it forces execution of the following operators and may lead to incorrect results for variables that are directly or indirectly mutated. Also, the performance impact will be similar to Approach2 since we have additional overhead to propagate exceptions from the callback instead of onstart callback. The performance impact of adding Exception Handling Functionality with Approach2 needs to be investigated.
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