I have updated the comments in apply_handle_tuple_routing() (see 0002) to better explain what's going on with UPDATE handling. I also rearranged the tests a bit for clarity.
Attached updated patches. -- Thank you, Amit Langote EnterpriseDB: http://www.enterprisedb.com
v1-0001-worker.c-refactor-code-to-look-up-local-tuple.patch
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v15-0003-Publish-partitioned-table-inserts-as-its-own.patch
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v15-0002-Add-subscription-support-to-replicate-into-parti.patch
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