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A while ago, while designing an MPP system for AWS Lambda, I came to the conclusion that in the absence of statistics, merge operators for joins and aggregates
by senderista 5y ago
A while ago, while designing an MPP system for AWS Lambda, I came to the conclusion that in the absence of statistics, merge operators for joins and aggregates have better worst-case behavior than the hash-based alternatives. (See samplesort for a distributed sort algorithm that works well for sorting the merge inputs.)