SQL/MED catalog manipulation facilities

This doesn't do any remote or external things yet, but it gives modules
like plproxy and dblink a standardized and future-proof system for
managing their connection information.

Martin Pihlak and Peter Eisentraut

src/include/nodes/parsenodes.h

@@ -13,7 +13,7 @@
  * Portions Copyright (c) 1996-2008, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.383 2008/12/18 18:20:35 tgl Exp $
+ * $PostgreSQL: pgsql/src/include/nodes/parsenodes.h,v 1.384 2008/12/19 16:25:19 petere Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -49,6 +49,13 @@ typedef enum SortByNulls
 	SORTBY_NULLS_LAST
 } SortByNulls;
 
+/* Alter operations for generic options */
+typedef enum AlterOptionOp
+{
+	ALTER_OPT_DROP = -1,
+	ALTER_OPT_SET,
+	ALTER_OPT_ADD
+} AlterOptionOp;
 
 /*
  * Grantable rights are encoded so that we can OR them together in a bitmask.
@@ -67,7 +74,7 @@ typedef uint32 AclMode;			/* a bitmask of privilege bits */
 #define ACL_REFERENCES	(1<<5)
 #define ACL_TRIGGER		(1<<6)
 #define ACL_EXECUTE		(1<<7)	/* for functions */
-#define ACL_USAGE		(1<<8)	/* for languages and namespaces */
+#define ACL_USAGE		(1<<8)	/* for languages, namespaces, FDWs, and servers */
 #define ACL_CREATE		(1<<9)	/* for namespaces and databases */
 #define ACL_CREATE_TEMP (1<<10) /* for databases */
 #define ACL_CONNECT		(1<<11) /* for databases */
@@ -466,6 +473,17 @@ typedef struct DefElem
 	Node	   *arg;			/* a (Value *) or a (TypeName *) */
 } DefElem;
 
+/*
+ * Option definition. Used in options definition lists, with optional alter
+ * operation.
+ */
+typedef struct OptionDefElem
+{
+	NodeTag			type;
+	AlterOptionOp	alter_op;		/* Alter operation: ADD/SET/DROP */
+	DefElem		   *def;			/* The actual definition */
+} OptionDefElem;
+
 /*
  * LockingClause - raw representation of FOR UPDATE/SHARE options
  *
@@ -930,6 +948,8 @@ typedef enum ObjectType
 	OBJECT_CONVERSION,
 	OBJECT_DATABASE,
 	OBJECT_DOMAIN,
+	OBJECT_FDW,
+	OBJECT_FOREIGN_SERVER,
 	OBJECT_FUNCTION,
 	OBJECT_INDEX,
 	OBJECT_LANGUAGE,
@@ -1076,6 +1096,8 @@ typedef enum GrantObjectType
 	ACL_OBJECT_RELATION,		/* table, view */
 	ACL_OBJECT_SEQUENCE,		/* sequence */
 	ACL_OBJECT_DATABASE,		/* database */
+	ACL_OBJECT_FDW,				/* foreign-data wrapper */
+	ACL_OBJECT_FOREIGN_SERVER,	/* foreign server */
 	ACL_OBJECT_FUNCTION,		/* function */
 	ACL_OBJECT_LANGUAGE,		/* procedural language */
 	ACL_OBJECT_NAMESPACE,		/* namespace */
@@ -1328,6 +1350,96 @@ typedef struct DropTableSpaceStmt
 	bool		missing_ok;		/* skip error if missing? */
 } DropTableSpaceStmt;
 
+/* ----------------------
+ *		Create/Drop FOREIGN DATA WRAPPER Statements
+ * ----------------------
+ */
+
+typedef struct CreateFdwStmt
+{
+	NodeTag		type;
+	char	   *fdwname;		/* foreign-data wrapper name */
+	char	   *library;		/* libray name */
+	List	   *options;		/* generic options to FDW */
+} CreateFdwStmt;
+
+typedef struct AlterFdwStmt
+{
+	NodeTag		type;
+	char	   *fdwname;		/* foreign-data wrapper name */
+	char	   *library;		/* libray name */
+	List	   *options;		/* generic options to FDW */
+} AlterFdwStmt;
+
+typedef struct DropFdwStmt
+{
+	NodeTag		type;
+	char	   *fdwname;		/* foreign-data wrapper name */
+	bool		missing_ok;		/* don't complain if missing */
+	DropBehavior behavior;		/* drop behavior - cascade/restrict */
+} DropFdwStmt;
+
+/* ----------------------
+ *		Create/Drop FOREIGN SERVER Statements
+ * ----------------------
+ */
+
+typedef struct CreateForeignServerStmt
+{
+	NodeTag		type;
+	char	   *servername;		/* server name */
+	char	   *servertype;		/* optional server type */
+	char	   *version;		/* optional server version */
+	char	   *fdwname;		/* FDW name */
+	List	   *options;		/* generic options to server */
+} CreateForeignServerStmt;
+
+typedef struct AlterForeignServerStmt
+{
+	NodeTag		type;
+	char	   *servername;		/* server name */
+	char	   *version;		/* optional server version */
+	List	   *options;		/* generic options to server */
+	bool		has_version;	/* version specified */
+} AlterForeignServerStmt;
+
+typedef struct DropForeignServerStmt
+{
+	NodeTag		type;
+	char	   *servername;		/* server name */
+	bool		missing_ok;		/* ignore missing servers */
+	DropBehavior behavior;		/* drop behavior - cascade/restrict */
+} DropForeignServerStmt;
+
+/* ----------------------
+ *		Create/Drop USER MAPPING Statements
+ * ----------------------
+ */
+
+typedef struct CreateUserMappingStmt
+{
+	NodeTag		type;
+	char	   *username;		/* username or PUBLIC/CURRENT_USER */
+	char	   *servername;		/* server name */
+	List	   *options;		/* generic options to server */
+} CreateUserMappingStmt;
+
+typedef struct AlterUserMappingStmt
+{
+	NodeTag		type;
+	char	   *username;		/* username or PUBLIC/CURRENT_USER */
+	char	   *servername;		/* server name */
+	List	   *options;		/* generic options to server */
+} AlterUserMappingStmt;
+
+typedef struct DropUserMappingStmt
+{
+	NodeTag		type;
+	char	   *username;		/* username or PUBLIC/CURRENT_USER */
+	char	   *servername;		/* server name */
+	bool		missing_ok;		/* ignore missing mappings */
+} DropUserMappingStmt;
+
 /* ----------------------
  *		Create/Drop TRIGGER Statements
  * ----------------------