diff -crN mysql_fdw_base/mysql_fdw.cpp mysql_fdw/mysql_fdw.cpp
*** mysql_fdw_base/mysql_fdw.cpp	2022-12-07 15:00:45.911005716 +0800
--- mysql_fdw/mysql_fdw.cpp	2022-12-07 15:02:06.026126832 +0800
***************
*** 167,185 ****
  static bool mysqlAnalyzeForeignTable(Relation relation,
  									 AcquireSampleRowsFunc *func,
  									 BlockNumber *totalpages);
- #if PG_VERSION_NUM >= 90500
  static ForeignScan *mysqlGetForeignPlan(PlannerInfo *root,
  										RelOptInfo *foreignrel,
  										Oid foreigntableid,
  										ForeignPath *best_path, List *tlist,
  										List *scan_clauses, Plan *outer_plan);
- #else
- static ForeignScan *mysqlGetForeignPlan(PlannerInfo *root,
- 										RelOptInfo *foreignrel,
- 										Oid foreigntableid,
- 										ForeignPath *best_path, List *tlist,
- 										List *scan_clauses);
- #endif
  static void mysqlEstimateCosts(PlannerInfo *root, RelOptInfo *baserel,
  							   Cost *startup_cost, Cost *total_cost,
  							   Oid foreigntableid);
--- 167,177 ----
***************
*** 976,984 ****
  									 total_cost,
  									 NIL,	/* no pathkeys */
  									 baserel->lateral_relids,
- #if PG_VERSION_NUM >= 90500
  									 NULL,	/* no extra plan */
- #endif
  									 NULL));	/* no fdw_private data */
  }
  
--- 968,974 ----
***************
*** 987,1003 ****
   * mysqlGetForeignPlan
   * 		Get a foreign scan plan node
   */
- #if PG_VERSION_NUM >= 90500
  static ForeignScan *
  mysqlGetForeignPlan(PlannerInfo *root, RelOptInfo *foreignrel,
  					Oid foreigntableid, ForeignPath *best_path,
  					List *tlist, List *scan_clauses, Plan *outer_plan)
- #else
- static ForeignScan *
- mysqlGetForeignPlan(PlannerInfo *root, RelOptInfo *foreignrel,
- 					Oid foreigntableid, ForeignPath *best_path,
- 					List *tlist, List *scan_clauses)
- #endif
  {
  	MySQLFdwRelationInfo *fpinfo = (MySQLFdwRelationInfo *) foreignrel->fdw_private;
  	Index		scan_relid = foreignrel->relid;
--- 977,986 ----
***************
*** 1097,1109 ****
  	 * field of the finished plan node; we can't keep them in private state
  	 * because then they wouldn't be subject to later planner processing.
  	 */
- #if PG_VERSION_NUM >= 90500
  	return make_foreignscan(tlist, local_exprs, scan_relid, params_list,
  							fdw_private, NIL, NIL, outer_plan);
- #else
- 	return make_foreignscan(tlist, local_exprs, scan_relid, params_list,
- 							fdw_private);
- #endif
  }
  
  /*
--- 1080,1087 ----