A problem in ExecModifyTable

Hi hackers,
Recently, I noticed a great patch in pg 14.
"Rework planning and execution of UPDATE and DELETE. (86dc90056dfdbd9d1b891718d2e5614e3e432f35)"
This changes the DML execution of the partitioned table and makes it more friendly.
But I am very confused about the following changes:
```
+ relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
+ if (relkind == RELKIND_RELATION ||
+ relkind == RELKIND_MATVIEW ||
+ relkind == RELKIND_PARTITIONED_TABLE)
{
- char relkind;
- Datum datum;
- bool isNull;
-
- relkind = resultRelInfo->ri_RelationDesc->rd_rel->relkind;
- if (relkind == RELKIND_RELATION || relkind == RELKIND_MATVIEW)
- {
- datum = ExecGetJunkAttribute(slot,
- junkfilter->jf_junkAttNo,
- &isNull);
- /* shouldn't ever get a null result... */```
According to my understanding, the parent table of a partitioned table does not store any tuples.
Then why is "relkind = = RELKIND_PARTITIONED_TABLE" suddenly added here ?

There is no comment on this point in the code.
Can you answer my confusion? Be deeply grateful.

Regards & Thanks Adger