support filter with predicate in BetaRowset

[imay]

Support predicate filter in BetaRowset iterator.

It's better if we can support lazy materialization.

[gaodayue]

If you mean filter rows by columns's zonemap, it's already supported

[imay]

@gaodayue

If you mean filter rows by columns's zonemap, it's already supported

I mean that vectorized predicate filter. In AlphaRowset, this logic locates in ColumnData, we should support it in SegmentIterator to filter data as soon as possible.

[gaodayue]

I see, thanks

[kangpinghuang]

I will do this feature

[kangpinghuang]

I will split this job into several step:

1. I will move original v1's predicate logic to segment v2 to provide this feature quickly.
2. I will refactor the current column predicate framework because current column predicate is based on row block. I will modify it to calculate based on column cell. This work wil be the base of the following work.
3. I will realize lazy materiazation to optimize data read.
4. I will realize the optimization to push predicate evalution to page decoder which will optimize in some situation, eg: dict encoded page.

and more future works which will be done in next phase, including:

1. support more complex predicate calculation in v2, like or/not predicate

[EmmyMiao87]

#1775