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Commit846b5a5

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Prevent extensions from creating custom GUCs that are GUC_LIST_QUOTE.
Pending some solution for the problems noted in commit7428699,disallow dynamic creation of GUC_LIST_QUOTE variables.If there are any extensions out there using this feature, they'd notbe happy for us to start enforcing this rule in minor releases, sothis is a HEAD-only change. The previous commit didn't make thingsany worse than they already were for such cases.Discussion:https://postgr.es/m/20180111064900.GA51030@paquier.xyz
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‎src/backend/utils/misc/guc.c

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@@ -7606,6 +7606,15 @@ init_custom_variable(const char *name,
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!process_shared_preload_libraries_in_progress)
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elog(FATAL,"cannot create PGC_POSTMASTER variables after startup");
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/*
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* We can't support custom GUC_LIST_QUOTE variables, because the wrong
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* things would happen if such a variable were set or pg_dump'd when the
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* defining extension isn't loaded. Again, treat this as fatal because
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* the loadable module may be partly initialized already.
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*/
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if (flags&GUC_LIST_QUOTE)
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elog(FATAL,"extensions cannot define GUC_LIST_QUOTE variables");
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/*
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* Before pljava commit 398f3b876ed402bdaec8bc804f29e2be95c75139
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* (2015-12-15), two of that module's PGC_USERSET variables facilitated

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