Invented by Peter and bug-fixed by Stefan, here comes an improved version of the loop-lifted child step: instead of aligning the candidate BAT with the scan over the pre_size BAT via expensive binary search, we now apply a synchronised (forward) scan that uses "large steps" on the candidate BAT where possible.
Invented by Peter and bug-fixed by Stefan,
here comes an improved version of the loop-lifted child step:
instead of aligning the candidate BAT with the scan over the pre_size BAT
via expensive binary search, we now apply a synchronised (forward) scan
that uses "large steps" on the candidate BAT where possible.

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