Giving Key a Vocabulary in Dyalog APL - Extending the Key Operator

Explore a conference talk from Dyalog '23 where Adám Brudzewsky discusses enhancing the key operator (⌸) in Dyalog APL. Learn about the operator's current capabilities in data grouping, summarization, and counting, as well as its limitations. Discover Brudzewsky's proposed extension to address issues such as result ordering, handling missing keys, and unwanted data inclusion. Gain insights into potential improvements for data scientists and finance professionals working with APL. Follow the discussion from the operator's introduction to the proposed vocabulary operand, concluding with a comprehensive summary of the enhancements.

The key operator
Sorting the result of a query
Missing items in the data
Querying a subset of the data
Often compute unique values twice
Proposed vocabulary as operand to key
Summary