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由 Daniel Gustafsson 提交于
The gp_enable_alter_table_inherit_cols GUC was used to allow a list of columns to override the attribute discovery for inheritance in ALTER TABLE INHERIT. According to code comments the only consumer of this was gpmigrator, but no callsite remains and no support in pg_dumpall remains either. Remove the leftovers of this to avoid a potential footgun and get us closer to upstream code.
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