pgsql: Generalize concept of temporary relations to "relation persisten

Generalize concept of temporary relations to "relation persistence".

This commit replaces pg_class.relistemp with pg_class.relpersistence;
and also modifies the RangeVar node type to carry relpersistence rather
than istemp. It also removes removes rd_istemp from RelationData and
instead performs the correct computation based on relpersistence.

For clarity, we add three new macros: RelationNeedsWAL(),
RelationUsesLocalBuffers(), and RelationUsesTempNamespace(), so that we
can clarify the purpose of each check that previous depended on
rd_istemp.

This is intended as infrastructure for the upcoming unlogged tables
patch, as well as for future possible work on global temporary tables.

Branch
------
master

Details
-------
http://git.postgresql.org/gitweb?p=postgresql.git;a=commitdiff;h=5f7b58fad8f45c69bb67944779dce67e2f481995

Modified Files
--------------
src/backend/access/gin/ginbtree.c | 6 +-
src/backend/access/gin/ginfast.c | 6 +-
src/backend/access/gin/gininsert.c | 4 +-
src/backend/access/gin/ginutil.c | 2 +-
src/backend/access/gin/ginvacuum.c | 4 +-
src/backend/access/gist/gist.c | 12 +++---
src/backend/access/gist/gistvacuum.c | 2 +-
src/backend/access/heap/heapam.c | 34 +++++++-------
src/backend/access/heap/pruneheap.c | 2 +-
src/backend/access/heap/rewriteheap.c | 6 +-
src/backend/access/nbtree/nbtinsert.c | 6 +-
src/backend/access/nbtree/nbtpage.c | 10 ++--
src/backend/access/nbtree/nbtsort.c | 12 +++---
src/backend/bootstrap/bootparse.y | 2 +
src/backend/catalog/catalog.c | 16 ++++++-
src/backend/catalog/heap.c | 13 +++--
src/backend/catalog/index.c | 10 +++--
src/backend/catalog/namespace.c | 12 +++---
src/backend/catalog/storage.c | 24 ++++++++--
src/backend/catalog/toasting.c | 3 +-
src/backend/commands/cluster.c | 5 +-
src/backend/commands/indexcmds.c | 4 +-
src/backend/commands/sequence.c | 8 ++--
src/backend/commands/tablecmds.c | 79 ++++++++++++++++++--------------
src/backend/commands/tablespace.c | 8 ++--
src/backend/commands/vacuumlazy.c | 11 ++---
src/backend/commands/view.c | 13 +++---
src/backend/executor/execMain.c | 9 +++-
src/backend/nodes/copyfuncs.c | 2 +-
src/backend/nodes/equalfuncs.c | 2 +-
src/backend/nodes/makefuncs.c | 3 +-
src/backend/nodes/outfuncs.c | 2 +-
src/backend/nodes/readfuncs.c | 2 +-
src/backend/parser/gram.y | 61 ++++++++++++-------------
src/backend/parser/parse_utilcmd.c | 7 ++-
src/backend/postmaster/autovacuum.c | 4 +-
src/backend/storage/buffer/bufmgr.c | 4 +-
src/backend/utils/adt/dbsize.c | 28 ++++++++----
src/backend/utils/cache/relcache.c | 71 ++++++++++++++++++-----------
src/include/catalog/catalog.h | 2 +-
src/include/catalog/catversion.h | 2 +-
src/include/catalog/heap.h | 2 +
src/include/catalog/pg_class.h | 15 ++++---
src/include/catalog/storage.h | 2 +-
src/include/commands/tablespace.h | 2 +-
src/include/nodes/primnodes.h | 2 +-
src/include/utils/rel.h | 25 ++++++++++-
src/include/utils/relcache.h | 3 +-
48 files changed, 334 insertions(+), 230 deletions(-)