1 files changed, 120 insertions, 0 deletions
diff --git a/src/backend/catalog/pg_namespace.c b/src/backend/catalog/pg_namespace.c
new file mode 100644
index 0000000..5ec8800
--- /dev/null
+++ b/src/backend/catalog/pg_namespace.c
@@ -0,0 +1,120 @@
+/*-------------------------------------------------------------------------
+ *
+ * pg_namespace.c
+ *	  routines to support manipulation of the pg_namespace relation
+ *
+ * Portions Copyright (c) 1996-2022, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ *
+ * IDENTIFICATION
+ *	  src/backend/catalog/pg_namespace.c
+ *
+ *-------------------------------------------------------------------------
+ */
+#include "postgres.h"
+
+#include "access/htup_details.h"
+#include "access/table.h"
+#include "catalog/catalog.h"
+#include "catalog/dependency.h"
+#include "catalog/indexing.h"
+#include "catalog/objectaccess.h"
+#include "catalog/pg_namespace.h"
+#include "utils/builtins.h"
+#include "utils/rel.h"
+#include "utils/syscache.h"
+
+
+/* ----------------
+ * NamespaceCreate
+ *
+ * Create a namespace (schema) with the given name and owner OID.
+ *
+ * If isTemp is true, this schema is a per-backend schema for holding
+ * temporary tables.  Currently, it is used to prevent it from being
+ * linked as a member of any active extension.  (If someone does CREATE
+ * TEMP TABLE in an extension script, we don't want the temp schema to
+ * become part of the extension). And to avoid checking for default ACL
+ * for temp namespace (as it is not necessary).
+ * ---------------
+ */
+Oid
+NamespaceCreate(const char *nspName, Oid ownerId, bool isTemp)
+{
+	Relation	nspdesc;
+	HeapTuple	tup;
+	Oid			nspoid;
+	bool		nulls[Natts_pg_namespace];
+	Datum		values[Natts_pg_namespace];
+	NameData	nname;
+	TupleDesc	tupDesc;
+	ObjectAddress myself;
+	int			i;
+	Acl		   *nspacl;
+
+	/* sanity checks */
+	if (!nspName)
+		elog(ERROR, "no namespace name supplied");
+
+	/* make sure there is no existing namespace of same name */
+	if (SearchSysCacheExists1(NAMESPACENAME, PointerGetDatum(nspName)))
+		ereport(ERROR,
+				(errcode(ERRCODE_DUPLICATE_SCHEMA),
+				 errmsg("schema \"%s\" already exists", nspName)));
+
+	if (!isTemp)
+		nspacl = get_user_default_acl(OBJECT_SCHEMA, ownerId,
+									  InvalidOid);
+	else
+		nspacl = NULL;
+
+	nspdesc = table_open(NamespaceRelationId, RowExclusiveLock);
+	tupDesc = nspdesc->rd_att;
+
+	/* initialize nulls and values */
+	for (i = 0; i < Natts_pg_namespace; i++)
+	{
+		nulls[i] = false;
+		values[i] = (Datum) NULL;
+	}
+
+	nspoid = GetNewOidWithIndex(nspdesc, NamespaceOidIndexId,
+								Anum_pg_namespace_oid);
+	values[Anum_pg_namespace_oid - 1] = ObjectIdGetDatum(nspoid);
+	namestrcpy(&nname, nspName);
+	values[Anum_pg_namespace_nspname - 1] = NameGetDatum(&nname);
+	values[Anum_pg_namespace_nspowner - 1] = ObjectIdGetDatum(ownerId);
+	if (nspacl != NULL)
+		values[Anum_pg_namespace_nspacl - 1] = PointerGetDatum(nspacl);
+	else
+		nulls[Anum_pg_namespace_nspacl - 1] = true;
+
+
+	tup = heap_form_tuple(tupDesc, values, nulls);
+
+	CatalogTupleInsert(nspdesc, tup);
+	Assert(OidIsValid(nspoid));
+
+	table_close(nspdesc, RowExclusiveLock);
+
+	/* Record dependencies */
+	myself.classId = NamespaceRelationId;
+	myself.objectId = nspoid;
+	myself.objectSubId = 0;
+
+	/* dependency on owner */
+	recordDependencyOnOwner(NamespaceRelationId, nspoid, ownerId);
+
+	/* dependencies on roles mentioned in default ACL */
+	recordDependencyOnNewAcl(NamespaceRelationId, nspoid, 0, ownerId, nspacl);
+
+	/* dependency on extension ... but not for magic temp schemas */
+	if (!isTemp)
+		recordDependencyOnCurrentExtension(&myself, false);
+
+	/* Post creation hook for new schema */
+	InvokeObjectPostCreateHook(NamespaceRelationId, nspoid, 0);
+
+	return nspoid;
+}