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A key segment can either be sorted in ascending
(lowest value to highest value) or descending (highest value to lowest value) order.
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Almost all key segments in Venice tables will be in ascending order, but there are a few
exceptions.
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Note that this affects the meaning of "Greater" when you are doing a "Greater than" or
"Greater or Equal to" SeekBy or doing a GetNext().
For a descending key segment this meaning is reversed
so a "Greater" will find a smaller value, and a GetNext() will move towards a smaller value.
The analogous is true for the meaning of "Less" and GetPrevious().
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