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Awk associative arrays can replace sort | uniq pipelines for log aggregation, trading disk I/O for memory. Learn the single-pass pattern, key coercion rules, and cardinality limits.
Learn how to use the APL key operator ⌸ to group rows by a key column and apply an aggregation function, with step‑by‑step code, validation checks, and recovery tips for common errors.
Learn how data.table’s keying and in‑place operations can cut group‑by and join times from seconds to milliseconds on large datasets. A step‑by‑step example and trade‑off discussion included.
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