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Sort dictionary data alphabetically in the ORC writer (#14295)
Strings in the dictionary data streams are now sorted alphabetically. Reduces file size in some cases because compression can be more efficient. Reduces throughput up to 22% when writing strings columns (3% speedup when dictionary encoding is not used, though!). Benchmark data does not demonstrate the compression difference, but we have some user data that compresses almost 30% better. Authors: - Vukasin Milovanovic (https://github.com/vuule) Approvers: - David Wendt (https://github.com/davidwendt) - Divye Gala (https://github.com/divyegala) - Alessandro Bellina (https://github.com/abellina) URL: #14295
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