Allow per-column foreign data wrapper options.

Shigeru Hanada, with fairly minor editing by me.

src/backend/nodes/copyfuncs.c

@@ -2312,6 +2312,7 @@ _copyColumnDef(ColumnDef *from)
 	COPY_NODE_FIELD(collClause);
 	COPY_SCALAR_FIELD(collOid);
 	COPY_NODE_FIELD(constraints);
+	COPY_NODE_FIELD(fdwoptions);
 
 	return newnode;
 }