Re: Perform streaming logical transactions by background workers and parallel apply

Patch v88-0001 LGTM.

Below are just some minor review comments about the commit message.

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Commit message

1.
We have discussed having this parameter as a subscription option but
exposing a parameter that is primarily used for testing/debugging to users
didn't seem advisable and there is no other such parameter. The other
option we have discussed is to have a separate GUC for subscriber-side
testing but it appears that for the current testing existing parameter is
sufficient and avoids adding another GUC.

SUGGESTION
We discussed exposing this parameter as a subscription option, but it
did not seem advisable since it is primarily used for
testing/debugging and there is no other such developer option.

We also discussed having separate GUCs for publisher/subscriber-side,
but for current testing/debugging requirements, one GUC is sufficient.

~~

2.
Reviewed-by: Pater Smith, Kuroda Hayato, Amit Kapila

"Pater" --> "Peter"

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Kind Regards,
Peter Smith.
Fujitsu Australia