@@ -3938,8 +3938,10 @@ InitTempTableNamespace(void)
39383938 * decide if a temporary namespace is in use or not. We assume that
39393939 * assignment of namespaceId is an atomic operation. Even if it is not,
39403940 * the temporary relation which resulted in the creation of this temporary
3941- * namespace is still locked until the current transaction commits, so it
3942- * would not be accessible yet, acting as a barrier.
3941+ * namespace is still locked until the current transaction commits, and
3942+ * its pg_namespace row is not visible yet. However it does not matter:
3943+ * this flag makes the namespace as being in use, so no objects created on
3944+ * it would be removed concurrently.
39433945 */
39443946MyProc -> tempNamespaceId = namespaceId ;
39453947
@@ -3976,10 +3978,12 @@ AtEOXact_Namespace(bool isCommit, bool parallel)
39763978
39773979/*
39783980 * Reset the temporary namespace flag in MyProc. We assume that
3979- * this operation is atomic. Even if it is not, the temporary
3980- * table which created this namespace is still locked until this
3981- * transaction aborts so it would not be visible yet, acting as a
3982- * barrier.
3981+ * this operation is atomic.
3982+ *
3983+ * Because this transaction is aborting, the pg_namespace row is
3984+ * not visible to anyone else anyway, but that doesn't matter:
3985+ * it's not a problem if objects contained in this namespace are
3986+ * removed concurrently.
39833987 */
39843988MyProc -> tempNamespaceId = InvalidOid ;
39853989}
@@ -4037,10 +4041,12 @@ AtEOSubXact_Namespace(bool isCommit, SubTransactionId mySubid,
40374041
40384042/*
40394043 * Reset the temporary namespace flag in MyProc. We assume that
4040- * this operation is atomic. Even if it is not, the temporary
4041- * table which created this namespace is still locked until this
4042- * transaction aborts so it would not be visible yet, acting as a
4043- * barrier.
4044+ * this operation is atomic.
4045+ *
4046+ * Because this subtransaction is aborting, the pg_namespace row
4047+ * is not visible to anyone else anyway, but that doesn't matter:
4048+ * it's not a problem if objects contained in this namespace are
4049+ * removed concurrently.
40444050 */
40454051MyProc -> tempNamespaceId = InvalidOid ;
40464052}