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Implement Column Statistics / Data Profiling for Numeric Columns #44

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phpisciuneri opened this issue May 20, 2020 · 1 comment

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phpisciuneri commented May 20, 2020

As discussed in our original Spark Summit presentation: See 22 min mark.

Listening to myself is awful btw.

Inspired by the nice visualization provided by Facets Overview while leveraging spark to handle large distributed data sets.

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Column Stats #42

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phpisciuneri commented May 20, 2020

Initial considerations involve calculating the statistics as efficiently as possible. Some different approaches off of the top of my head include:

calculating statistics using UDAFs. For exact calculation of the histogram and standard deviation this would appear to require at least two passes over the data.
leveraging existing hive/sql functions
exploring/using approximate methods for histograms, std dev, etc. on large data

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