pgsql: Don't reset additional columns on subscriber to NULL on UPDATE

Don't reset additional columns on subscriber to NULL on UPDATE

When a publisher table has fewer columns than a subscriber, the update
of a row on the publisher should result in updating of only the columns
in common. The previous coding mistakenly reset the values of
additional columns on the subscriber to NULL because it failed to skip
updates of columns not found in the attribute map.

Author: Petr Jelinek <petr(dot)jelinek(at)2ndquadrant(dot)com>

Branch
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REL_10_STABLE

Details
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https://git.postgresql.org/pg/commitdiff/a14b52c61454e3d23f7d0ab0affa56f8abfdf505

Modified Files
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src/backend/replication/logical/worker.c | 7 ++-
src/test/subscription/t/008_diff_schema.pl | 80 ++++++++++++++++++++++++++++++
2 files changed, 85 insertions(+), 2 deletions(-)