Fix pg_dump to dump shell types.

Per discussion, it really ought to do this.  The original choice to
exclude shell types was probably made in the dark ages before we made
it harder to accidentally create shell types; but that was in 7.3.

Also, cause the standard regression tests to leave a shell type behind,
for convenience in testing the case in pg_dump and pg_upgrade.

Back-patch to all supported branches.

src/bin/pg_dump/pg_dump.c

@@ -158,6 +158,7 @@ static void dumpType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo);
 static void dumpBaseType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo);
 static void dumpEnumType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo);
 static void dumpRangeType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo);
+static void dumpUndefinedType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo);
 static void dumpDomain(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo);
 static void dumpCompositeType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo);
 static void dumpCompositeTypeColComments(Archive *fout, TypeInfo *tyinfo);
@@ -1329,11 +1330,6 @@ selectDumpableType(TypeInfo *tyinfo)
 	/* dump only types in dumpable namespaces */
 	if (!tyinfo->dobj.namespace->dobj.dump)
 		tyinfo->dobj.dump = false;
-
-	/* skip undefined placeholder types */
-	else if (!tyinfo->isDefined)
-		tyinfo->dobj.dump = false;
-
 	else
 		tyinfo->dobj.dump = true;
 }
@@ -3707,7 +3703,7 @@ getTypes(Archive *fout, int *numTypes)
 			}
 		}
 
-		if (strlen(tyinfo[i].rolname) == 0 && tyinfo[i].isDefined)
+		if (strlen(tyinfo[i].rolname) == 0)
 			write_msg(NULL, "WARNING: owner of data type \"%s\" appears to be invalid\n",
 					  tyinfo[i].dobj.name);
 	}
@@ -8554,6 +8550,8 @@ dumpType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo)
 		dumpEnumType(fout, dopt, tyinfo);
 	else if (tyinfo->typtype == TYPTYPE_RANGE)
 		dumpRangeType(fout, dopt, tyinfo);
+	else if (tyinfo->typtype == TYPTYPE_PSEUDO && !tyinfo->isDefined)
+		dumpUndefinedType(fout, dopt, tyinfo);
 	else
 		write_msg(NULL, "WARNING: typtype of data type \"%s\" appears to be invalid\n",
 				  tyinfo->dobj.name);
@@ -8820,6 +8818,73 @@ dumpRangeType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo)
 	destroyPQExpBuffer(query);
 }
 
+/*
+ * dumpUndefinedType
+ *	  writes out to fout the queries to recreate a !typisdefined type
+ *
+ * This is a shell type, but we use different terminology to distinguish
+ * this case from where we have to emit a shell type definition to break
+ * circular dependencies.  An undefined type shouldn't ever have anything
+ * depending on it.
+ */
+static void
+dumpUndefinedType(Archive *fout, DumpOptions *dopt, TypeInfo *tyinfo)
+{
+	PQExpBuffer q = createPQExpBuffer();
+	PQExpBuffer delq = createPQExpBuffer();
+	PQExpBuffer labelq = createPQExpBuffer();
+	char	   *qtypname;
+
+	qtypname = pg_strdup(fmtId(tyinfo->dobj.name));
+
+	/*
+	 * DROP must be fully qualified in case same name appears in pg_catalog.
+	 */
+	appendPQExpBuffer(delq, "DROP TYPE %s.",
+					  fmtId(tyinfo->dobj.namespace->dobj.name));
+	appendPQExpBuffer(delq, "%s;\n",
+					  qtypname);
+
+	if (dopt->binary_upgrade)
+		binary_upgrade_set_type_oids_by_type_oid(fout,
+												 q, tyinfo->dobj.catId.oid);
+
+	appendPQExpBuffer(q, "CREATE TYPE %s;\n",
+					  qtypname);
+
+	appendPQExpBuffer(labelq, "TYPE %s", qtypname);
+
+	if (dopt->binary_upgrade)
+		binary_upgrade_extension_member(q, &tyinfo->dobj, labelq->data);
+
+	ArchiveEntry(fout, tyinfo->dobj.catId, tyinfo->dobj.dumpId,
+				 tyinfo->dobj.name,
+				 tyinfo->dobj.namespace->dobj.name,
+				 NULL,
+				 tyinfo->rolname, false,
+				 "TYPE", SECTION_PRE_DATA,
+				 q->data, delq->data, NULL,
+				 NULL, 0,
+				 NULL, NULL);
+
+	/* Dump Type Comments and Security Labels */
+	dumpComment(fout, dopt, labelq->data,
+				tyinfo->dobj.namespace->dobj.name, tyinfo->rolname,
+				tyinfo->dobj.catId, 0, tyinfo->dobj.dumpId);
+	dumpSecLabel(fout, dopt, labelq->data,
+				 tyinfo->dobj.namespace->dobj.name, tyinfo->rolname,
+				 tyinfo->dobj.catId, 0, tyinfo->dobj.dumpId);
+
+	dumpACL(fout, dopt, tyinfo->dobj.catId, tyinfo->dobj.dumpId, "TYPE",
+			qtypname, NULL, tyinfo->dobj.name,
+			tyinfo->dobj.namespace->dobj.name,
+			tyinfo->rolname, tyinfo->typacl);
+
+	destroyPQExpBuffer(q);
+	destroyPQExpBuffer(delq);
+	destroyPQExpBuffer(labelq);
+}
+
 /*
  * dumpBaseType
  *	  writes out to fout the queries to recreate a user-defined base type

src/bin/pg_dump/pg_dump.h

@@ -127,7 +127,7 @@ typedef struct _typeInfo
 	char		typtype;		/* 'b', 'c', etc */
 	bool		isArray;		/* true if auto-generated array type */
 	bool		isDefined;		/* true if typisdefined */
-	/* If it's a dumpable base type, we create a "shell type" entry for it */
+	/* If needed, we'll create a "shell type" entry for it; link that here: */
 	struct _shellTypeInfo *shellType;	/* shell-type entry, or NULL */
 	/* If it's a domain, we store links to its constraints here: */
 	int			nDomChecks;

src/test/regress/expected/create_type.out

@@ -29,6 +29,8 @@ ERROR:  type "shell" already exists
 DROP TYPE shell;
 DROP TYPE shell;     -- fail, type not exist
 ERROR:  type "shell" does not exist
+-- also, let's leave one around for purposes of pg_dump testing
+CREATE TYPE myshell;
 --
 -- Test type-related default values (broken in releases before PG 7.2)
 --

src/test/regress/sql/create_type.sql

@@ -31,6 +31,9 @@ CREATE TYPE shell;   -- fail, type already present
 DROP TYPE shell;
 DROP TYPE shell;     -- fail, type not exist
 
+-- also, let's leave one around for purposes of pg_dump testing
+CREATE TYPE myshell;
+
 --
 -- Test type-related default values (broken in releases before PG 7.2)
 --