Improve RLS handling in copy.c
To avoid a race condition where the relation being COPY'd could be
changed into a view or otherwise modified, keep the original lock
on the relation. Further, fully qualify the relation when building
the query up.
Also remove the poorly thought-out Assert() and check the entire
relationOids list as, post-RLS, there can certainly be multiple
relations involved and the planner does not guarantee their ordering.
Per discussion with Noah and Andres.
Back-patch to 9.5 where RLS was introduced.
Branch
------
REL9_5_STABLE
Details
-------
http://git.postgresql.org/pg/commitdiff/5d179a28fb4c819f3812c40fa7e626b1d3081982
Modified Files
--------------
src/backend/commands/copy.c | 45 +++++++++++++++----------
src/test/regress/expected/rowsecurity.out | 50 +++++++++++++++++++++++++++-
src/test/regress/sql/rowsecurity.sql | 51 ++++++++++++++++++++++++++++-
3 files changed, 126 insertions(+), 20 deletions(-)
