Add `sum_moving` function

malloydata / malloy

Malloy is an experimental language for describing data relationships and transformations.

http://www.malloydata.dev

MIT License

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Closed christopherswenson closed 8 months ago

christopherswenson commented 8 months ago

Adds a sum_moving function similar to the avg_moving function:

Two overloads:

sum_moving(x, n) — sum of x for the current row plus n preceding rows
sum_moving(x, n, m) — sum of x for the current row plus n preceding rows and m following rows