CelebrateVC

Bug: Undefined behavior of Group by if group key is not provided in select fields

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### Describe the bug with the current implementation of Iterator for grouped data since the BTreeMap is keyed by `&arr`, this leads to queries with a group by key missing...

Bugfix #1229 implement query check

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## What is the motivation? bugfix query group by issues and minor issue from last pr not done yet still have to implement other values just wanted to put this...

Implementing DEEP Protocol marked as NotImplementedError

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I made this alteration to the library for my use back in May 2020 and thought I might as well share the change to expand this.