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40 Simplify tape block format. · postgrespro/postgres@01ec256 · GitHub
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Simplify tape block format.
No more indirect blocks. The blocks form a linked list instead. This saves some memory, because we don't need to have a buffer in memory to hold the indirect block (or blocks). To reflect that, TAPE_BUFFER_OVERHEAD is reduced from 3 to 1 buffer, which allows using more memory for building the initial runs. Reviewed by Peter Geoghegan and Robert Haas. Discussion: https://www.postgresql.org/message-id/34678beb-938e-646e-db9f-a7def5c44ada%40iki.fi
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