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In TX, a very efficient way to perform a lookup is to use SEARCHUP/SEARCHDOWN, provided the series is properly sorted.
However, the first call is very costly as it need to build the B-Tree to be used for later navigations. This creates a threshold (series size , number of calls) below which it is worse using SEARCHUP than LOOKUP.
If we had a way to generate the data including the B-Tree and then reuse it for later calls, that could make a big difference in terms of performances.
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This would help increase performances for each and every map which has an intensive use of lookup functions.
The impact would be greater on maps called many times a day, with only a few lookup/searchup calls for each invocation.
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