[PGSQL] - RLSSupportPostgresMailboxMapper should support updateACL parallel

[vttranlina]

original apache#2644 (comment)

Dod

Pass test case: updateAclShouldWorkWellInMultiThreadEnv

[chibenwa]

Can you please recall why standard PG implem passes and not RLS?

[vttranlina]

RLS has table mailbox_member while nonRLS does not.

error

java.lang.RuntimeException: org.jooq.exception.IntegrityConstraintViolationException: SQL [insert into mailbox_member (
  user_name,
  mailbox_id
)
values (
  $1, 
  cast($2 as uuid)
)]; duplicate key value violates unique constraint "mailbox_member_pkey"

@hungphan227 explained this table for optimizing queries.

Need to investigate to understand the reason