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Thomas Munro 212fab9926 Relax transactional restrictions on ALTER TYPE ... ADD VALUE (redux). ... Originally committed as 15bc038f (plus some follow-ups), this was reverted in 28e07270 due to a problem discovered in parallel workers. This new version corrects that problem by sending the list of uncommitted enum values to parallel workers. Here follows the original commit message describing the change: To prevent possibly breaking indexes on enum columns, we must keep uncommitted enum values from getting stored in tables, unless we can be sure that any such column is new in the current transaction. Formerly, we enforced this by disallowing ALTER TYPE ... ADD VALUE from being executed at all in a transaction block, unless the target enum type had been created in the current transaction. This patch removes that restriction, and instead insists that an uncommitted enum value can't be referenced unless it belongs to an enum type created in the same transaction as the value. Per discussion, this should be a bit less onerous. It does require each function that could possibly return a new enum value to SQL operations to check this restriction, but there aren't so many of those that this seems unmaintainable. Author: Andrew Dunstan and Tom Lane, with parallel query fix by Thomas Munro Reviewed-by: Tom Lane Discussion: https://postgr.es/m/CAEepm%3D0Ei7g6PaNTbcmAh9tCRahQrk%3Dr5ZWLD-jr7hXweYX3yg%40mail.gmail.com Discussion: https://postgr.es/m/4075.1459088427%40sss.pgh.pa.us		7 years ago
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adt	Relax transactional restrictions on ALTER TYPE ... ADD VALUE (redux).	7 years ago
cache	Change rewriter/planner/executor/plancache to depend on RTE rellockmode.	7 years ago
error	Implement %m in src/port/snprintf.c, and teach elog.c to rely on that.	7 years ago
fmgr	Clean up in the wake of TupleDescGetSlot() removal / 10763358c3.	7 years ago
hash	Allow memory contexts to have both fixed and variable ident strings.	8 years ago
init	Add application_name to connection authorized msg	7 years ago
mb	Avoid use of unportable hex constant in convutils.pm	8 years ago
misc	Add application_name to connection authorized msg	7 years ago
mmgr	Constify dsa_size_class_map and use a better type.	7 years ago
resowner	Use a ResourceOwner to track buffer pins in all cases.	8 years ago
sort	Split ExecStoreTuple into ExecStoreHeapTuple and ExecStoreBufferHeapTuple.	7 years ago
time	Fix misc typos, mostly in comments.	8 years ago
.gitignore	Rearrange makefile rules for running Gen_fmgrtab.pl.	8 years ago
Gen_dummy_probes.pl	Clean up some perlcritic warnings	8 years ago
Gen_dummy_probes.sed	Update copyright for 2018	8 years ago
Gen_fmgrtab.pl	Assorted minor cleanups for bootstrap-data Perl scripts.	8 years ago
Makefile	Suppress compiler warnings when building with --enable-dtrace.	8 years ago
errcodes.txt	Relax transactional restrictions on ALTER TYPE ... ADD VALUE (redux).	7 years ago
generate-errcodes.pl	Update copyright for 2018	8 years ago
probes.d	Support parallel btree index builds.	8 years ago