Zachary Tong e5079ac288
[7.x backport] Add more flexibility to MovingFunction window alignment (#45159)
Introduce shift field to MovingFunction aggregation.

By default, shift = 0. Behavior, in this case, is the same as before.
Increasing shift by 1 moves starting window position by 1 to the right.

    To simply include current bucket to the window, use shift = 1
    For center alignment (n/2 values before and after the current bucket), use shift = window / 2
    For right alignment (n values after the current bucket), use shift = window.
2019-08-05 11:56:52 -04:00
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