*** a/src/backend/utils/adt/formatting.c
--- b/src/backend/utils/adt/formatting.c
***************
*** 781,787 **** static const KeyWord DCH_keywords[] = {
  	{"y", 1, DCH_Y, TRUE, FROM_CHAR_DATE_GREGORIAN},

  	/* last */
! 	{NULL, 0, 0, 0}
  };

  /* ----------
--- 781,787 ----
  	{"y", 1, DCH_Y, TRUE, FROM_CHAR_DATE_GREGORIAN},

  	/* last */
! 	{NULL, 0, 0, 0, 0}
  };

  /* ----------
***************