Introduce replication slots.

Replication slots are a crash-safe data structure which can be created
on either a master or a standby to prevent premature removal of
write-ahead log segments needed by a standby, as well as (with
hot_standby_feedback=on) pruning of tuples whose removal would cause
replication conflicts.  Slots have some advantages over existing
techniques, as explained in the documentation.

In a few places, we refer to the type of replication slots introduced
by this patch as "physical" slots, because forthcoming patches for
logical decoding will also have slots, but with somewhat different
properties.

Andres Freund and Robert Haas

src/include/nodes/replnodes.h

@@ -17,6 +17,11 @@
 #include "access/xlogdefs.h"
 #include "nodes/pg_list.h"
 
+typedef enum ReplicationKind {
+	REPLICATION_KIND_PHYSICAL,
+	REPLICATION_KIND_LOGICAL
+} ReplicationKind;
+
 
 /* ----------------------
  *		IDENTIFY_SYSTEM command
@@ -39,6 +44,30 @@ typedef struct BaseBackupCmd
 } BaseBackupCmd;
 
 
+/* ----------------------
+ *		CREATE_REPLICATION_SLOT command
+ * ----------------------
+ */
+typedef struct CreateReplicationSlotCmd
+{
+	NodeTag		type;
+	char       *slotname;
+	ReplicationKind kind;
+	char       *plugin;
+} CreateReplicationSlotCmd;
+
+
+/* ----------------------
+ *		DROP_REPLICATION_SLOT command
+ * ----------------------
+ */
+typedef struct DropReplicationSlotCmd
+{
+	NodeTag		type;
+	char       *slotname;
+} DropReplicationSlotCmd;
+
+
 /* ----------------------
  *		START_REPLICATION command
  * ----------------------
@@ -46,8 +75,11 @@ typedef struct BaseBackupCmd
 typedef struct StartReplicationCmd
 {
 	NodeTag		type;
+	ReplicationKind kind;
+	char	   *slotname;
 	TimeLineID	timeline;
 	XLogRecPtr	startpoint;
+	List       *options;
 } StartReplicationCmd;