Given a large volume of data, we want to determine the average of a certain field, grouped by some other field.
This is a very simple exercise, and it probably does not constitute a pattern, but it does provide a useful introduction to PhixFlow and the aggregate functions built into the pipe functionality.
Solution:
Create a
...
table (loaded from a file is fine) containing a list of countries, years and populations.
Create second
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table from the data in the first
...
table.
Configure the pipe that joins the 2
...
tables to calculate the average population, grouped by country