The prologue of set_append_rel_size() mentions * .... Note that in the inheritance case, * the first member relation is actually the same table as is mentioned in * the parent RTE ... but it has a different RTE and RelOptInfo.
This isn't true about partitioned tables anymore. We do not create RelOptInfo of the partitioned table and thus is not first member relation. We could argue that inheritance in case of partitioned tables is just an implementation detail and partitioned table is not "inherited" in true sense. So "inheritance case" referred to here does not cover partitioning and so the sentence still holds. But I guess, this needs some change so that we do not expect first member to be same as partitioned table. I am not able to craft an elegant sentence but how about something like attached? -- Best Wishes, Ashutosh Bapat EnterpriseDB Corporation The Postgres Database Company
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