pgsql: Add SysCacheGetAttrNotNull for guaranteed not-null attrs

Add SysCacheGetAttrNotNull for guaranteed not-null attrs

When extracting an attr from a cached tuple in the syscache with
SysCacheGetAttr the isnull parameter must be checked in case the
attr cannot be NULL. For cases when this is known beforehand, a
wrapper is introduced which perform the errorhandling internally
on behalf of the caller, invoking an elog in case of a NULL attr.

Reviewed-by: Tom Lane <tgl(at)sss(dot)pgh(dot)pa(dot)us>
Reviewed-by: Peter Eisentraut <peter(dot)eisentraut(at)enterprisedb(dot)com>
Reviewed-by: David Rowley <dgrowleyml(at)gmail(dot)com>
Discussion: https://postgr.es/m/AD76405E-DB45-46B6-941F-17B1EB3A9076@yesql.se

Branch
------
master

Details
-------
https://git.postgresql.org/pg/commitdiff/d435f15fff3cf3cf5d6cfcfd63e21acc0f737829

Modified Files
--------------
src/backend/access/brin/brin_inclusion.c | 7 +-
src/backend/access/brin/brin_minmax.c | 7 +-
src/backend/access/brin/brin_minmax_multi.c | 7 +-
src/backend/access/index/indexam.c | 6 +-
src/backend/catalog/aclchk.c | 38 +++------
src/backend/catalog/index.c | 20 ++---
src/backend/catalog/objectaddress.c | 23 ++----
src/backend/catalog/pg_constraint.c | 33 +++-----
src/backend/catalog/pg_proc.c | 25 ++----
src/backend/catalog/pg_subscription.c | 32 +++-----
src/backend/commands/collationcmds.c | 23 ++----
src/backend/commands/dbcommands.c | 11 +--
src/backend/commands/indexcmds.c | 7 +-
src/backend/commands/matview.c | 9 +--
src/backend/commands/subscriptioncmds.c | 10 +--
src/backend/commands/tablecmds.c | 27 ++-----
src/backend/commands/typecmds.c | 8 +-
src/backend/executor/execReplication.c | 6 +-
src/backend/executor/functions.c | 7 +-
src/backend/optimizer/util/clauses.c | 23 +-----
src/backend/parser/parse_func.c | 7 +-
src/backend/parser/parse_utilcmd.c | 30 +++----
src/backend/partitioning/partbounds.c | 9 +--
src/backend/statistics/extended_stats.c | 5 +-
src/backend/utils/adt/amutils.c | 5 +-
src/backend/utils/adt/pg_locale.c | 19 ++---
src/backend/utils/adt/ruleutils.c | 121 +++++++++-------------------
src/backend/utils/cache/lsyscache.c | 21 ++---
src/backend/utils/cache/partcache.c | 10 +--
src/backend/utils/cache/syscache.c | 27 +++++++
src/backend/utils/fmgr/fmgr.c | 39 +++------
src/backend/utils/fmgr/funcapi.c | 25 ++----
src/backend/utils/init/postinit.c | 9 +--
src/include/utils/syscache.h | 3 +
src/pl/plperl/plperl.c | 6 +-
src/pl/plpgsql/src/pl_comp.c | 6 +-
src/pl/plpython/plpy_procedure.c | 6 +-
src/pl/tcl/pltcl.c | 7 +-
38 files changed, 232 insertions(+), 452 deletions(-)