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Commit01ec256

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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 tohold the indirect block (or blocks). To reflect that, TAPE_BUFFER_OVERHEADis reduced from 3 to 1 buffer, which allows using more memory for buildingthe 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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