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diff --git a/src/backend/optimizer/geqo/geqo_ox1.c b/src/backend/optimizer/geqo/geqo_ox1.c
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+/*------------------------------------------------------------------------
+*
+* geqo_ox1.c
+*
+*	 order crossover [OX] routines;
+*	 OX1 operator according to Davis
+*	 (Proc Int'l Joint Conf on AI)
+*
+* src/backend/optimizer/geqo/geqo_ox1.c
+*
+*-------------------------------------------------------------------------
+*/
+
+/* contributed by:
+   =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
+   *  Martin Utesch				 * Institute of Automatic Control	   *
+   =							 = University of Mining and Technology =
+   *  utesch@aut.tu-freiberg.de  * Freiberg, Germany				   *
+   =*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=
+ */
+
+/* the ox algorithm is adopted from Genitor : */
+/*************************************************************/
+/*															 */
+/*	Copyright (c) 1990										 */
+/*	Darrell L. Whitley										 */
+/*	Computer Science Department								 */
+/*	Colorado State University								 */
+/*															 */
+/*	Permission is hereby granted to copy all or any part of  */
+/*	this program for free distribution.   The author's name  */
+/*	and this copyright notice must be included in any copy.  */
+/*															 */
+/*************************************************************/
+
+#include "postgres.h"
+#include "optimizer/geqo_random.h"
+#include "optimizer/geqo_recombination.h"
+
+#if defined(OX1)
+
+/* ox1
+ *
+ *	 position crossover
+ */
+void
+ox1(PlannerInfo *root, Gene *tour1, Gene *tour2, Gene *offspring, int num_gene,
+	City * city_table)
+{
+	int			left,
+				right,
+				k,
+				p,
+				temp;
+
+	/* initialize city table */
+	for (k = 1; k <= num_gene; k++)
+		city_table[k].used = 0;
+
+	/* select portion to copy from tour1 */
+	left = geqo_randint(root, num_gene - 1, 0);
+	right = geqo_randint(root, num_gene - 1, 0);
+
+	if (left > right)
+	{
+		temp = left;
+		left = right;
+		right = temp;
+	}
+
+	/* copy portion from tour1 to offspring */
+	for (k = left; k <= right; k++)
+	{
+		offspring[k] = tour1[k];
+		city_table[(int) tour1[k]].used = 1;
+	}
+
+	k = (right + 1) % num_gene; /* index into offspring */
+	p = k;						/* index into tour2 */
+
+	/* copy stuff from tour2 to offspring */
+	while (k != left)
+	{
+		if (!city_table[(int) tour2[p]].used)
+		{
+			offspring[k] = tour2[p];
+			k = (k + 1) % num_gene;
+			city_table[(int) tour2[p]].used = 1;
+		}
+		p = (p + 1) % num_gene; /* increment tour2-index */
+	}
+}
+
+#endif							/* defined(OX1) */