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DataFixerUpper
A set of utilities designed for incremental building, merging and optimization of data transformations.
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InfluxDB
Power Real-Time Data Analytics at Scale. Get real-time insights from all types of time series data with InfluxDB. Ingest, query, and analyze billions of data points in real-time with unbounded cardinality.
No need to guess, we know pretty much exactly what this is referring to, because it was performance changes in one of the open-source components, DataFixerUpper. The code is open to the public, and you can look at the changes yourself if you want to. It's somewhat technical but I'll try to explain.
NOTE:
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Hence, a higher number means a more popular project.