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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