@@ -3197,16 +3197,17 @@ ReorderBufferAddNewTupleCids(ReorderBuffer *rb, TransactionId xid,
31973197}
31983198
31993199/*
3200- *Setup theinvalidation of the toplevel transaction .
3200+ *Accumulate theinvalidations for executing them later .
32013201 *
32023202 * This needs to be called for each XLOG_XACT_INVALIDATIONS message and
3203- * accumulates all the invalidation messages in the toplevel transaction as
3204- * well as in the form of change in reorder buffer. We require to record it in
3205- * form of the change so that we can execute only the required invalidations
3206- * instead of executing all the invalidations on each CommandId increment. We
3207- * also need to accumulate these in the toplevel transaction because in some
3208- * cases we skip processing the transaction (see ReorderBufferForget), we need
3209- * to execute all the invalidations together.
3203+ * accumulates all the invalidation messages in the toplevel transaction, if
3204+ * available, otherwise in the current transaction, as well as in the form of
3205+ * change in reorder buffer. We require to record it in form of the change
3206+ * so that we can execute only the required invalidations instead of executing
3207+ * all the invalidations on each CommandId increment. We also need to
3208+ * accumulate these in the txn buffer because in some cases where we skip
3209+ * processing the transaction (see ReorderBufferForget), we need to execute
3210+ * all the invalidations together.
32103211 */
32113212void
32123213ReorderBufferAddInvalidations (ReorderBuffer * rb ,TransactionId xid ,
@@ -3222,8 +3223,9 @@ ReorderBufferAddInvalidations(ReorderBuffer *rb, TransactionId xid,
32223223oldcontext = MemoryContextSwitchTo (rb -> context );
32233224
32243225/*
3225- * Collect all the invalidations under the top transaction so that we can
3226- * execute them all together. See comment atop this function
3226+ * Collect all the invalidations under the top transaction, if available,
3227+ * so that we can execute them all together. See comments atop this
3228+ * function.
32273229 */
32283230if (txn -> toptxn )
32293231txn = txn -> toptxn ;
