pgsql: Stop table sync workers when subscription relation entry is remo

Stop table sync workers when subscription relation entry is removed

When a table sync worker is in waiting state and the subscription table
entry is removed because of a concurrent subscription refresh, the
worker could be left orphaned. To avoid that, explicitly stop the
worker when the pg_subscription_rel entry is removed.

Reported-by: Masahiko Sawada <sawada.mshk@gmail.com>

Branch
------
master

Details
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https://git.postgresql.org/pg/commitdiff/ddd7b22b225ae41d16ceb218b387645cb9becfdc

Modified Files
--------------
src/backend/commands/subscriptioncmds.c | 2 ++
1 file changed, 2 insertions(+)

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