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Don't try to translate NULL in GetConfigOptionByNum().
Noticed via -fsanitize=undefined. Introduced when a few columns in GetConfigOptionByNum() / pg_settings started to be translated in72be8c29a
/ PG 12. Backpatch to all affected branches, for the same reasons as46ab07ffda
. Discussion: https://postgr.es/m/20220323173537.ll7klrglnp4gn2um@alap3.anarazel.de Backpatch: 12-
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@ -9051,7 +9051,7 @@ GetConfigOptionByNum(int varnum, const char **values, bool *noshow)
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values[4] = _(conf->short_desc);
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/* extra_desc */
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values[5] = _(conf->long_desc);
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values[5] = conf->long_desc != NULL ? _(conf->long_desc) : NULL;
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/* context */
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values[6] = GucContext_Names[conf->context];
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