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Allow pg_rewind to use a standby server as the source system.
Using a hot standby server as the source has not been possible, because pg_rewind creates a temporary table in the source system, to hold the list of file ranges that need to be fetched. Refactor it to queue up the file fetch requests in pg_rewind's memory, so that the temporary table is no longer needed. Also update the logic to compute 'minRecoveryPoint' correctly, when the source is a standby server. Reviewed-by: Kyotaro Horiguchi, Soumyadeep Chakraborty Discussion: https://www.postgresql.org/message-id/0c5b3783-af52-3ee5-f8fa-6e794061f70d%40iki.fi
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‎doc/src/sgml/ref/pg_rewind.sgml

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@@ -173,7 +173,7 @@ PostgreSQL documentation
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with a role having sufficient permissions to execute the functions
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used by <application>pg_rewind</application> on the source server
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(see Notes section for details) or a superuser role. This option
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requires the source server to be running and not in recovery mode.
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requires the source server to be running and accepting connections.
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</para>
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</listitem>
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</varlistentry>

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