pgsql: Avoid retrieving dummy NULL columns in postgres_fdw.

Avoid retrieving dummy NULL columns in postgres_fdw.

This should provide some marginal overall savings, since it surely takes
many more cycles for the remote server to deal with the NULL columns than
it takes for postgres_fdw not to emit them. But really the reason is to
keep the emitted queries from looking quite so silly ...

Branch
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master

Details
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http://git.postgresql.org/pg/commitdiff/e690b9515072fd7767fdeca5c54166f6a77733bc

Modified Files
--------------
contrib/postgres_fdw/deparse.c | 95 +++++++---
contrib/postgres_fdw/expected/postgres_fdw.out | 250 +++++++++++++-----------
contrib/postgres_fdw/postgres_fdw.c | 155 +++++++++-------
contrib/postgres_fdw/postgres_fdw.h | 15 +-
contrib/postgres_fdw/sql/postgres_fdw.sql | 4 +-
5 files changed, 301 insertions(+), 218 deletions(-)

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