3 files changed, 15 insertions, 3 deletions
diff --git a/src/include/commands/extension.h b/src/include/commands/extension.h
index 10d08935a00..d0e94556f50 100644
--- a/src/include/commands/extension.h
+++ b/src/include/commands/extension.h
@@ -32,6 +32,8 @@ extern void CreateExtension(CreateExtensionStmt *stmt);
 extern void RemoveExtensions(DropStmt *stmt);
 extern void RemoveExtensionById(Oid extId);
 
+extern void ExecAlterExtensionAddStmt(AlterExtensionAddStmt *stmt);
+
 extern Oid	get_extension_oid(const char *extname, bool missing_ok);
 extern char *get_extension_name(Oid ext_oid);
 
diff --git a/src/include/nodes/nodes.h b/src/include/nodes/nodes.h
index 1ca5f1ef9a1..1ce97386315 100644
--- a/src/include/nodes/nodes.h
+++ b/src/include/nodes/nodes.h
@@ -356,6 +356,7 @@ typedef enum NodeTag
 	T_SecLabelStmt,
 	T_CreateForeignTableStmt,
 	T_CreateExtensionStmt,
+	T_AlterExtensionAddStmt,
 
 	/*
 	 * TAGS FOR PARSE TREE NODES (parsenodes.h)
diff --git a/src/include/nodes/parsenodes.h b/src/include/nodes/parsenodes.h
index 5de4dbd5ec1..2116c94d0d3 100644
--- a/src/include/nodes/parsenodes.h
+++ b/src/include/nodes/parsenodes.h
@@ -1060,13 +1060,13 @@ typedef struct SetOperationStmt
 /*
  * When a command can act on several kinds of objects with only one
  * parse structure required, use these constants to designate the
- * object type.
+ * object type.  Note that commands typically don't support all the types.
  */
 
 typedef enum ObjectType
 {
 	OBJECT_AGGREGATE,
-	OBJECT_ATTRIBUTE,			/* type's attribute, when distinct from column */
+	OBJECT_ATTRIBUTE,		/* type's attribute, when distinct from column */
 	OBJECT_CAST,
 	OBJECT_COLUMN,
 	OBJECT_CONSTRAINT,
@@ -1535,7 +1535,7 @@ typedef struct AlterTableSpaceOptionsStmt
 } AlterTableSpaceOptionsStmt;
 
 /* ----------------------
- *		Create Extension Statement
+ *		Create/Alter Extension Statements
  * ----------------------
  */
 
@@ -1546,6 +1546,15 @@ typedef struct CreateExtensionStmt
 	List	   *options;		/* List of DefElem nodes */
 } CreateExtensionStmt;
 
+typedef struct AlterExtensionAddStmt
+{
+	NodeTag		type;
+	char	   *extname;		/* Extension's name */
+	ObjectType	objtype;		/* Object's type */
+	List	   *objname;		/* Qualified name of the object */
+	List	   *objargs;		/* Arguments if needed (eg, for functions) */
+} AlterExtensionAddStmt;
+
 /* ----------------------
  *		Create/Drop FOREIGN DATA WRAPPER Statements
  * ----------------------