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(parent: 4b82ed6) | patch

Add per-index stats information in verbose logs of autovacuum

Add per-index stats information in verbose logs of autovacuum

Once a relation's autovacuum is completed, the logs include more
information about this relation state if the threshold of
log_autovacuum_min_duration (or its relation option) is reached, with
for example contents about the statistics of the VACUUM operation for
the relation, WAL and system usage.

This commit adds more information about the statistics of the relation's
indexes, with one line of logs generated for each index. The index
stats were already calculated, but not printed in the context of
autovacuum yet. While on it, some refactoring is done to keep track of
the index statistics directly within LVRelStats, simplifying some
routines related to parallel VACUUMs.

Author: Masahiko Sawada
Reviewed-by: Michael Paquier, Euler Taveira
Discussion: https://postgr.es/m/CAD21AoAy6SxHiTivh5yAPJSUE4S=QRPpSZUdafOSz0R+fRcM6Q@mail.gmail.com

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