The attached patch (against HEAD) implements

COPY x (a,d,c,b) from stdin;
  COPY x (a,c) to stdout;

as well as the corresponding changes to pg_dump to use the new
functionality.  This functionality is not available when using
the BINARY option.  If a column is not specified in the COPY FROM
statement, its default values will be used.

In addition to this functionality, I tweaked a couple of the
error messages emitted by the new COPY <options> checks.

Brent Verner

src/include/nodes/parsenodes.h

@@ -7,7 +7,7 @@
  * Portions Copyright (c) 1996-2002, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
  *
- * $Id: parsenodes.h,v 1.189 2002/07/18 04:42:29 momjian Exp $
+ * $Id: parsenodes.h,v 1.190 2002/07/18 04:43:51 momjian Exp $
  *
  *-------------------------------------------------------------------------
  */
@@ -884,6 +884,7 @@ typedef struct CopyStmt
 {
 	NodeTag		type;
 	RangeVar   *relation;		/* the relation to copy */
+	List *attlist;
 	bool		is_from;		/* TO or FROM */
 	char	   *filename;		/* if NULL, use stdin/stdout */
 	List	   *options;		/* List of DefElem nodes */