Add new function pg_get_wal_summarizer_state().

Robert Haas <rhaas@postgresql.org>

Commit: d9ef650fca7bc574586f4171cd929cfd5240326e
Author: Robert Haas <rhaas@postgresql.org>
Date: 2024-01-11T17:41:18Z
Releases: 17.0
Add new function pg_get_wal_summarizer_state().

This makes it possible to access information about the progress
of WAL summarization from SQL. The previously-added functions
pg_available_wal_summaries() and pg_wal_summary_contents() only
examine on-disk state, but this function exposes information from
the server's shared memory.

Discussion: http://postgr.es/m/CA+Tgmobvqqj-DW9F7uUzT-cQqs6wcVb-Xhs=w=hzJnXSE-kRGw@mail.gmail.com

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