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Commit290e3b7

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Mark pg_config() stable rather than immutable
pg_config() has been marked immutable since its inception. As part of alarger discussion around the definition of immutable versus stable andrelated implications for marking functions parallel safe raised byAndres, the consensus was clearly that pg_config() is stable, sinceit could possibly change output even for the same minor version witha recompile or installation of a new binary. So mark it stable.Theoretically this could/should be backpatched, but it was deemed to be notworth the effort since in practice this is very unlikely to cause problemsin the real world.Discussion:https://postgr.es/m/20181126234521.rh3grz7aavx2ubjv@alap3.anarazel.de
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‎src/include/catalog/pg_proc.dat

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# pg_config
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{ oid => '3400', descr => 'pg_config binary as a function',
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proname => 'pg_config', prorows => '23', proretset => 't', proparallel => 'r',
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proname => 'pg_config',provolatile => 's',prorows => '23', proretset => 't', proparallel => 'r',
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prorettype => 'record', proargtypes => '', proallargtypes => '{text,text}',
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proargmodes => '{o,o}', proargnames => '{name,setting}',
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prosrc => 'pg_config' },

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