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由 Heikki Linnakangas 提交于
This re-implements compression that was lost in the WorkFile/BufFile refactoring. This new implementation uses Zstandard rather than zlib. Compression can be enabled with "gp_workfile_compression=on". It is disabled by default. Reviewed-by: NMel Kiyama <mkiyama@pivotal.io> Reviewed-by: NYandong Yao <yyao@pivotal.io>
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