BUG #15440: pg_dump does not preserve quoted identifiers forstatement-level trigger transition table names

The following bug has been logged on the website:

Bug reference:      15440
Logged by:          Karl Czajkowski
Email address:      karlcz@isi.edu
PostgreSQL version: 10.5
Operating system:   Linux
Description:

If I create a statement-level trigger using quoted identifiers with the new
transition table feature in pg10 and dump the database with pg_dump, the
dumped CREATE TRIGGER statements lack quotes on the identifier. This
prevents the database from properly round-tripping through dump and restore.
 The restored triggers will bind the unquoted identifier as the transition
table names, and my trigger function will encounter errors when it uses an
unknown relation.

Using a simple "sed" filter to rewrite my dump file repairs the dump, since
pg_dump did dump the proper mixed-case spelling of an identifier and only
omitted the wrapping double-quotation marks.

As an example, consider a create trigger clause like: ... REFERENCING OLD
TABLE AS "_myapp_oldtuples_Mixed_Case" ...

It appears in the dumped SQL as: ... REFERENCING OLD TABLE AS
_myapp_oldtuples_Mixed_Case ...