Redundant filter predicates not fully optimized

If we have a filter predicate repeated multiple times, Pinot may evaluate the predicate multiple times in certain cases. And if scanning is required for evaluating the predicate, it can have performance impact. For example:

```where ((a=1 and b=2) or (a=1 and c=2) or (a=1 and d=2))```

This could be re-written as:
```where ((a=1) and (b=2 or c = 2 or d = 2))```

The latter would evaluate the predicate `a=1` just once, where as the former would do it three times.