Propagate sort instrumentation from workers back to leader.

Up until now, when parallel query was used, no details about the
sort method or space used by the workers were available; details
were shown only for any sorting done by the leader.  Fix that.

Commit 1177ab1dabf72bafee8f19d904cee3a299f25892 forced the test case
added by commit 1f6d515a67ec98194c23a5db25660856c9aab944 to run
without parallelism; now that we have this infrastructure, allow
that again, with a little tweaking to make it pass with and without
force_parallel_mode.

Robert Haas and Tom Lane

Discussion: 
http://postgr.es/m/CA+Tgmoa2VBZW6S8AAXfhpHczb=rf6rqq2br+zjvegwj0uod...@mail.gmail.com

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/bf11e7ee2e3607bb67d25aec73aa53b2d7e9961b

Modified Files
--------------
src/backend/commands/explain.c          |  57 +++++++++++-
src/backend/executor/execParallel.c     | 155 ++++++++++++++++++--------------
src/backend/executor/nodeSort.c         |  97 ++++++++++++++++++++
src/backend/utils/sort/tuplesort.c      |  56 +++++++++---
src/include/executor/nodeSort.h         |   7 ++
src/include/nodes/execnodes.h           |  12 +++
src/include/utils/tuplesort.h           |  34 ++++++-
src/test/regress/expected/subselect.out |   5 +-
src/test/regress/sql/subselect.sql      |   6 +-
9 files changed, 342 insertions(+), 87 deletions(-)


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