Remove reg* pseudotype columns; add object info functions (#17)

Drop the `reg*` pseudotype columns
(`regclass`/`regconfig`/`regdictionary`/`regnamespace`/`regoperator`/`regprocedure`/`regtype`)
from `_object_reference._object_oid` in favor of a single plain `oid`
column (`object_oid`) and a plain `oid` `classid`, removing the
now-unnecessary `count_nulls`-backed `null_count` trigger that used to
arbitrate between them.

- Drop the `count_nulls` dependency entirely (the search_path workaround
DO block, `object_reference.control`'s `requires`, the Makefile install
target, and test setup) — the trigger above was its only reason for
being there.
- Add `object_reference.object__describe()` / `object__identity()` (thin
wrappers around `pg_describe_object()`/`pg_identify_object()`), and
`object__cleanup()` (best-effort delete, ignoring
`foreign_key_violation`), wired to a new `AFTER DELETE` trigger on
`object_group__object` so removing an object from its last group
auto-attempts cleanup.
- `object__getsert`'s core (`_object_v__for_update`) now refuses to
track objects living in a `pg_temp*`/`pg_toast_temp*` schema.
- Test updates: `object_group.sql`'s scratch tables switch from `TEMP`
to regular tables (temp objects are now rejected) plus new coverage for
the cleanup trigger; `base.sql` swaps the now-moot
count_nulls-relocation test for coverage of `object_oid`,
`object__describe()`/`object__identity()`, and temp-object rejection.
- `_object_reference._object_oid.object_oid` was later dropped too — it
always equaled `objid` and never diverged.

Author: jnasbyupgrade

META.in.json

@@ -9,7 +9,7 @@
     "X_comment": "The pgxntool Makefile will strip out empty keys to produce a working META.json, so it's fine to leave them here.",
     "X_comment": "NOTE: Don't get too cute with reformatting this file... some of the processing against it doesn't use a full JSON parser",
     "X_comment": "",
-    "X_comment": "I've tried to put things in a logical order. Comments welcome at https://github.com/decibel/pgxntool/issues!",
+    "X_comment": "I've tried to put things in a logical order. Comments welcome at https://github.com/Postgres-Extensions/pgxntool/issues!",
 
     "X_comment": "REQUIRED. Name of distribution.",
     "X_comment": "Note! Distribution names currently can't contain spaces.",
@@ -58,13 +58,13 @@
 
     "X_comment": "Optional. \"resources\": Web resources available for this distribution. http://pgxn.org/spec/#resources",
     "resources": {
-        "homepage": "http://github.com/decibel/object_reference/",
+        "homepage": "http://github.com/Postgres-Extensions/object_reference/",
         "bugtracker": {
-            "web": "http://github.com/decibel/object_reference/issues"
+            "web": "http://github.com/Postgres-Extensions/object_reference/issues"
         },
         "repository": {
-            "url": "git://github.com/decibel/object_reference.git",
-            "web": "http://github.com/decibel/object_reference/",
+            "url": "git://github.com/Postgres-Extensions/object_reference.git",
+            "web": "http://github.com/Postgres-Extensions/object_reference/",
             "type": "git"
         }
     },
@@ -76,11 +76,12 @@
 
         "build": {
             "requires": {
-                "PostgreSQL": "9.5.0"
+                "PostgreSQL": "12.0.0"
             }
         },
         "runtime": {
             "requires": {
+                "cat_tools": 0,
                 "plpgsql": 0
             }
         },
@@ -95,7 +96,7 @@
     "no_index": "",
 
     "X_comment": "Unusual. Package/tool used to generate this file.",
-    "generated_by": "pgxntool https://github.com/decibel/pgxntool",
+    "generated_by": "pgxntool https://github.com/Postgres-Extensions/pgxntool",
 
     "X_comment": "REQUIRED. Version info for this file. http://pgxn.org/spec/#meta-spec",
     "meta-spec": {

META.json

@@ -9,7 +9,7 @@
     "X_comment": "Keys marked REQUIRED or Optional are what you'd expect. Keys marked Unusual are keys you don't normally need to use.",
     "X_comment": "The pgxntool Makefile will strip out empty keys to produce a working META.json, so it's fine to leave them here.",
     "X_comment": "NOTE: Don't get too cute with reformatting this file... some of the processing against it doesn't use a full JSON parser",
-    "X_comment": "I've tried to put things in a logical order. Comments welcome at https://github.com/decibel/pgxntool/issues!",
+    "X_comment": "I've tried to put things in a logical order. Comments welcome at https://github.com/Postgres-Extensions/pgxntool/issues!",
 
     "X_comment": "REQUIRED. Name of distribution.",
     "X_comment": "Note! Distribution names currently can't contain spaces.",
@@ -56,13 +56,13 @@
 
     "X_comment": "Optional. \"resources\": Web resources available for this distribution. http://pgxn.org/spec/#resources",
     "resources": {
-        "homepage": "http://github.com/decibel/object_reference/",
+        "homepage": "http://github.com/Postgres-Extensions/object_reference/",
         "bugtracker": {
-            "web": "http://github.com/decibel/object_reference/issues"
+            "web": "http://github.com/Postgres-Extensions/object_reference/issues"
         },
         "repository": {
-            "url": "git://github.com/decibel/object_reference.git",
-            "web": "http://github.com/decibel/object_reference/",
+            "url": "git://github.com/Postgres-Extensions/object_reference.git",
+            "web": "http://github.com/Postgres-Extensions/object_reference/",
             "type": "git"
         }
     },
@@ -74,11 +74,12 @@
 
         "build": {
             "requires": {
-                "PostgreSQL": "9.5.0"
+                "PostgreSQL": "12.0.0"
             }
         },
         "runtime": {
             "requires": {
+                "cat_tools": 0,
                 "plpgsql": 0
             }
         },
@@ -92,7 +93,7 @@
     "X_comment": "Unusual. \"no_index\": Files/directories that should not be indexed. http://pgxn.org/spec/#no_index",
 
     "X_comment": "Unusual. Package/tool used to generate this file.",
-    "generated_by": "pgxntool https://github.com/decibel/pgxntool",
+    "generated_by": "pgxntool https://github.com/Postgres-Extensions/pgxntool",
 
     "X_comment": "REQUIRED. Version info for this file. http://pgxn.org/spec/#meta-spec",
     "meta-spec": {

Makefile

@@ -3,7 +3,7 @@ include pgxntool/base.mk
 testdeps: $(wildcard test/*.sql test/helpers/*.sql) # Be careful not to include directories in this
 testdeps: test_factory
 
-install: cat_tools count_nulls
+install: cat_tools
 
 test: dump_test
 extra_clean += $(wildcard test/dump/*.log)
@@ -15,11 +15,6 @@ cat_tools: $(DESTDIR)$(datadir)/extension/cat_tools.control
 $(DESTDIR)$(datadir)/extension/cat_tools.control:
 	pgxn install --unstable cat_tools
 
-.PHONY: count_nulls
-count_nulls: $(DESTDIR)$(datadir)/extension/count_nulls.control
-$(DESTDIR)$(datadir)/extension/count_nulls.control:
-	pgxn install --unstable count_nulls
-
 .PHONY: test_factory
 test_factory: $(DESTDIR)$(datadir)/extension/test_factory.control
 $(DESTDIR)$(datadir)/extension/test_factory.control: