jbrooks-stripe

Add APPROX_HISTOGRAM_K Operation

1

## Summary Adds an APPROX_HISTOGRAM_K operation based on the FrequentItems Sketch: https://datasketches.apache.org/docs/Frequency/FrequentItemsOverview.html This is mostly a wrapper on top of the frequent items sketch, but have made the two following...

Add skew and kurtosis operations

1

## Summary Adds operations for [skew](https://en.wikipedia.org/wiki/Skew) and [kurtosis](https://en.wikipedia.org/wiki/Kurtosis). The implementation uses the same Welford/Knuth approach as the variance operation. https://en.wikipedia.org/wiki/Algorithms_for_calculating_variance#Higher-order_statistics I have the operations set as non-deletable as the reversals...

## Summary Documentation updates for approx_histogram_k, skew, and kurtosis aggregations: https://github.com/airbnb/chronon/pull/735 https://github.com/airbnb/chronon/pull/740 ## Why / Goal ## Test Plan - [ ] Added Unit Tests - [ ] Covered by...

## Summary We found some online/offline inconsistencies with GroupBys when using multiple keys where some contained nulls. The online behavior would aggregate on (key1, null), whereas the offline would result...

## Summary Adds a BOUNDED_UNIQUE_COUNT aggregation. This will allow exact unique/distinct counts, but will cap at a given value to keep memory usage constant. ## Why / Goal We have...

Don't request null keys from KVStore

1

## Summary Updates the Fetcher to not include or attempt any requests when the keys are null. ## Why / Goal KVStore implementations are left up to consumers. In the...

Fix thread safety issue in consistency pipeline

2

## Summary This changes things such that a new instance of the AvroCodec is used instead of re-using the same one across requests. ## Why / Goal To log feature...