Awk Associative Arrays as a Streaming Group-By Engine
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.
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awkUsing APL’s Key Operator (⌸) for Group‑by Aggregation
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.
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