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Preserve row index order even after join operation

As per current Spotfire design, when doing the join, there's no row order guarantee afterwards, and it may change depending on algorithm used internally. It seems we used different algorithms for different data sizes because of memory / cpu tradeo...
about 10 years ago in Spotfire / Custom Expressions 0 Future Consideration

Enable caching in Expression Function

Data Function has a built-in Allow Caching option to avoid redundant run when input parameters don't change, while Expression Function does not.
over 2 years ago in Spotfire / Custom Expressions 0 Future Consideration