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                                            Sanha Lee

Design query replacement mechanism

This issue is related with #352

API: Support strong type checking for union operator

~~[TypeToken](https://github.com/google/guava/wiki/ReflectionExplained) of [Google guava](https://github.com/google/guava) might be helpfull~~ No, it doesn't work.

Implement a new query placement algorithm

![image](https://cloud.githubusercontent.com/assets/8844176/24827916/f78ab60c-1c8d-11e7-911e-579ccec6c3a1.png) We've decided to do query placement regarding the query's group like above.

Deal with close and connection problem in MQTT source

We have to consider that the connection between MIST and MQTT broker can be closed sometime.

Task: Profiling physical operators

This issue is related with #352