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Commit 01ec2563 authored by Heikki Linnakangas's avatar Heikki Linnakangas
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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
parent b86515da
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