diff --git a/contrib/bloom/blcost.c b/contrib/bloom/blcost.c
index 902d23e..2d8a7f1 100644
--- a/contrib/bloom/blcost.c
+++ b/contrib/bloom/blcost.c
@@ -13,7 +13,6 @@
 #include "postgres.h"
 
 #include "fmgr.h"
-#include "optimizer/cost.h"
 #include "utils/selfuncs.h"
 
 #include "bloom.h"
diff --git a/contrib/file_fdw/file_fdw.c b/contrib/file_fdw/file_fdw.c
index e7db83d..be626be 100644
--- a/contrib/file_fdw/file_fdw.c
+++ b/contrib/file_fdw/file_fdw.c
@@ -29,11 +29,10 @@
 #include "foreign/foreign.h"
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
-#include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/planmain.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
 #include "utils/sampling.h"
diff --git a/contrib/postgres_fdw/deparse.c b/contrib/postgres_fdw/deparse.c
index f368d4b..b0e44e5 100644
--- a/contrib/postgres_fdw/deparse.c
+++ b/contrib/postgres_fdw/deparse.c
@@ -48,10 +48,9 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "nodes/plannodes.h"
-#include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/prep.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "parser/parsetree.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
diff --git a/contrib/postgres_fdw/postgres_fdw.c b/contrib/postgres_fdw/postgres_fdw.c
index 9244fe7..f753fff 100644
--- a/contrib/postgres_fdw/postgres_fdw.c
+++ b/contrib/postgres_fdw/postgres_fdw.c
@@ -28,11 +28,11 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/cost.h"
 #include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/planmain.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 #include "optimizer/tlist.h"
 #include "parser/parsetree.h"
 #include "utils/builtins.h"
diff --git a/contrib/tsm_system_rows/tsm_system_rows.c b/contrib/tsm_system_rows/tsm_system_rows.c
index 69944f6..c92490f 100644
--- a/contrib/tsm_system_rows/tsm_system_rows.c
+++ b/contrib/tsm_system_rows/tsm_system_rows.c
@@ -33,8 +33,7 @@
 #include "access/tsmapi.h"
 #include "catalog/pg_type.h"
 #include "miscadmin.h"
-#include "optimizer/clauses.h"
-#include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "utils/sampling.h"
 
 PG_MODULE_MAGIC;
diff --git a/contrib/tsm_system_time/tsm_system_time.c b/contrib/tsm_system_time/tsm_system_time.c
index f516552..edeacf0 100644
--- a/contrib/tsm_system_time/tsm_system_time.c
+++ b/contrib/tsm_system_time/tsm_system_time.c
@@ -31,8 +31,7 @@
 #include "access/tsmapi.h"
 #include "catalog/pg_type.h"
 #include "miscadmin.h"
-#include "optimizer/clauses.h"
-#include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "utils/sampling.h"
 #include "utils/spccache.h"
 
diff --git a/src/backend/access/gist/gistbuild.c b/src/backend/access/gist/gistbuild.c
index 94463ff..bd142a3 100644
--- a/src/backend/access/gist/gistbuild.c
+++ b/src/backend/access/gist/gistbuild.c
@@ -22,7 +22,7 @@
 #include "access/xloginsert.h"
 #include "catalog/index.h"
 #include "miscadmin.h"
-#include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "storage/bufmgr.h"
 #include "storage/smgr.h"
 #include "utils/memutils.h"
diff --git a/src/backend/access/spgist/spgutils.c b/src/backend/access/spgist/spgutils.c
index de147d7..8e63c1f 100644
--- a/src/backend/access/spgist/spgutils.c
+++ b/src/backend/access/spgist/spgutils.c
@@ -22,7 +22,6 @@
 #include "access/transam.h"
 #include "access/xact.h"
 #include "catalog/pg_amop.h"
-#include "optimizer/paths.h"
 #include "storage/bufmgr.h"
 #include "storage/indexfsm.h"
 #include "storage/lmgr.h"
@@ -32,9 +31,6 @@
 #include "utils/lsyscache.h"
 #include "utils/syscache.h"
 
-extern Expr *spgcanorderbyop(IndexOptInfo *index,
-				PathKey *pathkey, int pathkeyno,
-				Expr *orderby_clause, int *indexcol_p);
 
 /*
  * SP-GiST handler function: return IndexAmRoutine with access method parameters
diff --git a/src/backend/access/tablesample/bernoulli.c b/src/backend/access/tablesample/bernoulli.c
index 5e5e32d..9360b5b 100644
--- a/src/backend/access/tablesample/bernoulli.c
+++ b/src/backend/access/tablesample/bernoulli.c
@@ -29,8 +29,7 @@
 #include "access/hash.h"
 #include "access/tsmapi.h"
 #include "catalog/pg_type.h"
-#include "optimizer/clauses.h"
-#include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "utils/builtins.h"
 
 
diff --git a/src/backend/access/tablesample/system.c b/src/backend/access/tablesample/system.c
index 383387b..298e0ab 100644
--- a/src/backend/access/tablesample/system.c
+++ b/src/backend/access/tablesample/system.c
@@ -31,8 +31,7 @@
 #include "access/relscan.h"
 #include "access/tsmapi.h"
 #include "catalog/pg_type.h"
-#include "optimizer/clauses.h"
-#include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "utils/builtins.h"
 
 
diff --git a/src/backend/access/transam/parallel.c b/src/backend/access/transam/parallel.c
index 9c55c20..ce2b616 100644
--- a/src/backend/access/transam/parallel.c
+++ b/src/backend/access/transam/parallel.c
@@ -28,7 +28,7 @@
 #include "libpq/pqformat.h"
 #include "libpq/pqmq.h"
 #include "miscadmin.h"
-#include "optimizer/planmain.h"
+#include "optimizer/optimizer.h"
 #include "pgstat.h"
 #include "storage/ipc.h"
 #include "storage/sinval.h"
diff --git a/src/backend/catalog/heap.c b/src/backend/catalog/heap.c
index cc865de..910f651 100644
--- a/src/backend/catalog/heap.c
+++ b/src/backend/catalog/heap.c
@@ -64,9 +64,7 @@
 #include "executor/executor.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/var.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
 #include "parser/parse_expr.h"
diff --git a/src/backend/catalog/index.c b/src/backend/catalog/index.c
index 225c078..169b2de 100644
--- a/src/backend/catalog/index.c
+++ b/src/backend/catalog/index.c
@@ -56,8 +56,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "parser/parser.h"
 #include "rewrite/rewriteManip.h"
 #include "storage/bufmgr.h"
diff --git a/src/backend/catalog/partition.c b/src/backend/catalog/partition.c
index 62d1ec6..0d3bc3a 100644
--- a/src/backend/catalog/partition.c
+++ b/src/backend/catalog/partition.c
@@ -24,9 +24,7 @@
 #include "catalog/pg_inherits.h"
 #include "catalog/pg_partitioned_table.h"
 #include "nodes/makefuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/prep.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "partitioning/partbounds.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/fmgroids.h"
diff --git a/src/backend/commands/cluster.c b/src/backend/commands/cluster.c
index ec1d6b6..a74af4c 100644
--- a/src/backend/commands/cluster.c
+++ b/src/backend/commands/cluster.c
@@ -38,7 +38,7 @@
 #include "commands/tablecmds.h"
 #include "commands/vacuum.h"
 #include "miscadmin.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "storage/bufmgr.h"
 #include "storage/lmgr.h"
 #include "storage/predicate.h"
diff --git a/src/backend/commands/copy.c b/src/backend/commands/copy.c
index 1c90934..86f2bf3 100644
--- a/src/backend/commands/copy.c
+++ b/src/backend/commands/copy.c
@@ -37,9 +37,7 @@
 #include "libpq/pqformat.h"
 #include "mb/pg_wchar.h"
 #include "miscadmin.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
-#include "optimizer/prep.h"
+#include "optimizer/optimizer.h"
 #include "nodes/makefuncs.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
diff --git a/src/backend/commands/explain.c b/src/backend/commands/explain.c
index 5d859b7..1831ea8 100644
--- a/src/backend/commands/explain.c
+++ b/src/backend/commands/explain.c
@@ -24,8 +24,6 @@
 #include "nodes/extensible.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planmain.h"
 #include "parser/parsetree.h"
 #include "rewrite/rewriteHandler.h"
 #include "storage/bufmgr.h"
diff --git a/src/backend/commands/functioncmds.c b/src/backend/commands/functioncmds.c
index ac40168..9a2f1a8 100644
--- a/src/backend/commands/functioncmds.c
+++ b/src/backend/commands/functioncmds.c
@@ -54,8 +54,7 @@
 #include "executor/executor.h"
 #include "funcapi.h"
 #include "miscadmin.h"
-#include "optimizer/clauses.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
 #include "parser/parse_expr.h"
diff --git a/src/backend/commands/indexcmds.c b/src/backend/commands/indexcmds.c
index 5b2b8d2..bd85099 100644
--- a/src/backend/commands/indexcmds.c
+++ b/src/backend/commands/indexcmds.c
@@ -42,9 +42,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_func.h"
 #include "parser/parse_oper.h"
diff --git a/src/backend/commands/tablecmds.c b/src/backend/commands/tablecmds.c
index ff76499..434be40 100644
--- a/src/backend/commands/tablecmds.c
+++ b/src/backend/commands/tablecmds.c
@@ -63,11 +63,7 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "nodes/parsenodes.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
-#include "optimizer/predtest.h"
-#include "optimizer/prep.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
diff --git a/src/backend/commands/trigger.c b/src/backend/commands/trigger.c
index 499030c..7b5896b 100644
--- a/src/backend/commands/trigger.c
+++ b/src/backend/commands/trigger.c
@@ -36,8 +36,7 @@
 #include "miscadmin.h"
 #include "nodes/bitmapset.h"
 #include "nodes/makefuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_collate.h"
 #include "parser/parse_func.h"
diff --git a/src/backend/commands/typecmds.c b/src/backend/commands/typecmds.c
index 35a6485..fa7161e 100644
--- a/src/backend/commands/typecmds.c
+++ b/src/backend/commands/typecmds.c
@@ -56,7 +56,7 @@
 #include "executor/executor.h"
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
 #include "parser/parse_expr.h"
diff --git a/src/backend/executor/execExpr.c b/src/backend/executor/execExpr.c
index 2e061a5..e52b806 100644
--- a/src/backend/executor/execExpr.c
+++ b/src/backend/executor/execExpr.c
@@ -40,8 +40,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "pgstat.h"
 #include "utils/builtins.h"
 #include "utils/datum.h"
diff --git a/src/backend/executor/execMain.c b/src/backend/executor/execMain.c
index 5975c52..9a20460 100644
--- a/src/backend/executor/execMain.c
+++ b/src/backend/executor/execMain.c
@@ -52,7 +52,6 @@
 #include "jit/jit.h"
 #include "mb/pg_wchar.h"
 #include "miscadmin.h"
-#include "optimizer/clauses.h"
 #include "parser/parsetree.h"
 #include "rewrite/rewriteManip.h"
 #include "storage/bufmgr.h"
diff --git a/src/backend/executor/execParallel.c b/src/backend/executor/execParallel.c
index ceea3d6..b79be91 100644
--- a/src/backend/executor/execParallel.c
+++ b/src/backend/executor/execParallel.c
@@ -39,8 +39,6 @@
 #include "executor/tqueue.h"
 #include "jit/jit.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/planmain.h"
-#include "optimizer/planner.h"
 #include "storage/spin.h"
 #include "tcop/tcopprot.h"
 #include "utils/datum.h"
diff --git a/src/backend/executor/nodeAgg.c b/src/backend/executor/nodeAgg.c
index 2a260a7..263a0f8 100644
--- a/src/backend/executor/nodeAgg.c
+++ b/src/backend/executor/nodeAgg.c
@@ -226,8 +226,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/tlist.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_agg.h"
 #include "parser/parse_coerce.h"
 #include "utils/acl.h"
diff --git a/src/backend/executor/nodeGather.c b/src/backend/executor/nodeGather.c
index 70a4e90..69d5a1f 100644
--- a/src/backend/executor/nodeGather.c
+++ b/src/backend/executor/nodeGather.c
@@ -38,7 +38,7 @@
 #include "executor/nodeSubplan.h"
 #include "executor/tqueue.h"
 #include "miscadmin.h"
-#include "optimizer/planmain.h"
+#include "optimizer/optimizer.h"
 #include "pgstat.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
diff --git a/src/backend/executor/nodeGatherMerge.c b/src/backend/executor/nodeGatherMerge.c
index 8635865..4de1d2b 100644
--- a/src/backend/executor/nodeGatherMerge.c
+++ b/src/backend/executor/nodeGatherMerge.c
@@ -23,7 +23,7 @@
 #include "executor/tqueue.h"
 #include "lib/binaryheap.h"
 #include "miscadmin.h"
-#include "optimizer/planmain.h"
+#include "optimizer/optimizer.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
 
diff --git a/src/backend/executor/nodeIndexscan.c b/src/backend/executor/nodeIndexscan.c
index cdf1ad0..324356e 100644
--- a/src/backend/executor/nodeIndexscan.c
+++ b/src/backend/executor/nodeIndexscan.c
@@ -37,7 +37,6 @@
 #include "lib/pairingheap.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
 #include "utils/array.h"
 #include "utils/datum.h"
 #include "utils/lsyscache.h"
diff --git a/src/backend/executor/nodeWindowAgg.c b/src/backend/executor/nodeWindowAgg.c
index 731391f..157ac04 100644
--- a/src/backend/executor/nodeWindowAgg.c
+++ b/src/backend/executor/nodeWindowAgg.c
@@ -41,7 +41,7 @@
 #include "executor/nodeWindowAgg.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_agg.h"
 #include "parser/parse_coerce.h"
 #include "utils/acl.h"
diff --git a/src/backend/jit/llvm/llvmjit_expr.c b/src/backend/jit/llvm/llvmjit_expr.c
index 351f6ec..df7e620 100644
--- a/src/backend/jit/llvm/llvmjit_expr.c
+++ b/src/backend/jit/llvm/llvmjit_expr.c
@@ -33,7 +33,6 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/planner.h"
 #include "parser/parse_coerce.h"
 #include "parser/parsetree.h"
 #include "pgstat.h"
diff --git a/src/backend/optimizer/path/allpaths.c b/src/backend/optimizer/path/allpaths.c
index e1ecfd6..72dcb12 100644
--- a/src/backend/optimizer/path/allpaths.c
+++ b/src/backend/optimizer/path/allpaths.c
@@ -35,13 +35,13 @@
 #include "optimizer/cost.h"
 #include "optimizer/geqo.h"
 #include "optimizer/inherit.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/plancat.h"
 #include "optimizer/planner.h"
 #include "optimizer/restrictinfo.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "parser/parse_clause.h"
 #include "parser/parsetree.h"
 #include "partitioning/partprune.h"
diff --git a/src/backend/optimizer/path/clausesel.c b/src/backend/optimizer/path/clausesel.c
index 5045270..abca03b 100644
--- a/src/backend/optimizer/path/clausesel.c
+++ b/src/backend/optimizer/path/clausesel.c
@@ -18,6 +18,7 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/plancat.h"
 #include "utils/fmgroids.h"
diff --git a/src/backend/optimizer/path/costsize.c b/src/backend/optimizer/path/costsize.c
index e288804..6c53f12 100644
--- a/src/backend/optimizer/path/costsize.c
+++ b/src/backend/optimizer/path/costsize.c
@@ -83,6 +83,7 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/placeholder.h"
diff --git a/src/backend/optimizer/path/equivclass.c b/src/backend/optimizer/path/equivclass.c
index 6e134ae..3454f12 100644
--- a/src/backend/optimizer/path/equivclass.c
+++ b/src/backend/optimizer/path/equivclass.c
@@ -24,11 +24,11 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/appendinfo.h"
 #include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/planmain.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 #include "utils/lsyscache.h"
 
 
diff --git a/src/backend/optimizer/path/indxpath.c b/src/backend/optimizer/path/indxpath.c
index be50d56..7e1a390 100644
--- a/src/backend/optimizer/path/indxpath.c
+++ b/src/backend/optimizer/path/indxpath.c
@@ -28,12 +28,11 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
-#include "optimizer/predtest.h"
 #include "optimizer/prep.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 #include "utils/builtins.h"
 #include "utils/bytea.h"
 #include "utils/lsyscache.h"
diff --git a/src/backend/optimizer/path/pathkeys.c b/src/backend/optimizer/path/pathkeys.c
index 9dac50e..56d839b 100644
--- a/src/backend/optimizer/path/pathkeys.c
+++ b/src/backend/optimizer/path/pathkeys.c
@@ -21,10 +21,9 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "nodes/plannodes.h"
-#include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
-#include "optimizer/tlist.h"
 #include "utils/lsyscache.h"
 
 
diff --git a/src/backend/optimizer/path/tidpath.c b/src/backend/optimizer/path/tidpath.c
index 94c88bd..466e996 100644
--- a/src/backend/optimizer/path/tidpath.c
+++ b/src/backend/optimizer/path/tidpath.c
@@ -40,10 +40,10 @@
 #include "catalog/pg_type.h"
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 
 
 /*
diff --git a/src/backend/optimizer/plan/analyzejoins.c b/src/backend/optimizer/plan/analyzejoins.c
index 1593dbe..a4efa69 100644
--- a/src/backend/optimizer/plan/analyzejoins.c
+++ b/src/backend/optimizer/plan/analyzejoins.c
@@ -25,11 +25,11 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/joininfo.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/planmain.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "utils/lsyscache.h"
 
 /* local functions */
diff --git a/src/backend/optimizer/plan/createplan.c b/src/backend/optimizer/plan/createplan.c
index 97d0c28..5656e10 100644
--- a/src/backend/optimizer/plan/createplan.c
+++ b/src/backend/optimizer/plan/createplan.c
@@ -28,16 +28,15 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/paramassign.h"
 #include "optimizer/paths.h"
 #include "optimizer/placeholder.h"
 #include "optimizer/plancat.h"
 #include "optimizer/planmain.h"
-#include "optimizer/predtest.h"
 #include "optimizer/restrictinfo.h"
 #include "optimizer/subselect.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "parser/parse_clause.h"
 #include "parser/parsetree.h"
 #include "partitioning/partprune.h"
diff --git a/src/backend/optimizer/plan/initsplan.c b/src/backend/optimizer/plan/initsplan.c
index 06ed32a..501bc00 100644
--- a/src/backend/optimizer/plan/initsplan.c
+++ b/src/backend/optimizer/plan/initsplan.c
@@ -21,6 +21,7 @@
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
 #include "optimizer/joininfo.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/placeholder.h"
@@ -28,7 +29,6 @@
 #include "optimizer/planner.h"
 #include "optimizer/prep.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 #include "parser/analyze.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/lsyscache.h"
diff --git a/src/backend/optimizer/plan/planagg.c b/src/backend/optimizer/plan/planagg.c
index d98cb89..8661709 100644
--- a/src/backend/optimizer/plan/planagg.c
+++ b/src/backend/optimizer/plan/planagg.c
@@ -35,6 +35,7 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/planmain.h"
diff --git a/src/backend/optimizer/plan/planner.c b/src/backend/optimizer/plan/planner.c
index 3304edb..d5a2fd2 100644
--- a/src/backend/optimizer/plan/planner.c
+++ b/src/backend/optimizer/plan/planner.c
@@ -43,6 +43,7 @@
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
 #include "optimizer/inherit.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/paramassign.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
@@ -52,7 +53,6 @@
 #include "optimizer/prep.h"
 #include "optimizer/subselect.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "parser/analyze.h"
 #include "parser/parsetree.h"
 #include "parser/parse_agg.h"
diff --git a/src/backend/optimizer/plan/setrefs.c b/src/backend/optimizer/plan/setrefs.c
index 6bd3b2d..0213a37 100644
--- a/src/backend/optimizer/plan/setrefs.c
+++ b/src/backend/optimizer/plan/setrefs.c
@@ -19,6 +19,7 @@
 #include "catalog/pg_type.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/planmain.h"
 #include "optimizer/planner.h"
diff --git a/src/backend/optimizer/plan/subselect.c b/src/backend/optimizer/plan/subselect.c
index da65d04..a998b9b 100644
--- a/src/backend/optimizer/plan/subselect.c
+++ b/src/backend/optimizer/plan/subselect.c
@@ -25,13 +25,13 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/paramassign.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/planmain.h"
 #include "optimizer/planner.h"
 #include "optimizer/prep.h"
 #include "optimizer/subselect.h"
-#include "optimizer/var.h"
 #include "parser/parse_relation.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/builtins.h"
diff --git a/src/backend/optimizer/prep/prepjointree.c b/src/backend/optimizer/prep/prepjointree.c
index 1f993d4..bfcdc7c 100644
--- a/src/backend/optimizer/prep/prepjointree.c
+++ b/src/backend/optimizer/prep/prepjointree.c
@@ -27,11 +27,11 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/placeholder.h"
 #include "optimizer/prep.h"
 #include "optimizer/subselect.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "parser/parse_relation.h"
 #include "parser/parsetree.h"
 #include "rewrite/rewriteManip.h"
diff --git a/src/backend/optimizer/prep/prepqual.c b/src/backend/optimizer/prep/prepqual.c
index 2bd6c20..e9a9497 100644
--- a/src/backend/optimizer/prep/prepqual.c
+++ b/src/backend/optimizer/prep/prepqual.c
@@ -33,7 +33,7 @@
 
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/prep.h"
 #include "utils/lsyscache.h"
 
diff --git a/src/backend/optimizer/prep/preptlist.c b/src/backend/optimizer/prep/preptlist.c
index 0e045f1..5392d1a 100644
--- a/src/backend/optimizer/prep/preptlist.c
+++ b/src/backend/optimizer/prep/preptlist.c
@@ -44,9 +44,9 @@
 #include "access/table.h"
 #include "catalog/pg_type.h"
 #include "nodes/makefuncs.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/prep.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "parser/parsetree.h"
 #include "parser/parse_coerce.h"
 #include "rewrite/rewriteHandler.h"
diff --git a/src/backend/optimizer/util/clauses.c b/src/backend/optimizer/util/clauses.c
index 816aa86..841a257 100644
--- a/src/backend/optimizer/util/clauses.c
+++ b/src/backend/optimizer/util/clauses.c
@@ -34,9 +34,9 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/planmain.h"
 #include "optimizer/prep.h"
-#include "optimizer/var.h"
 #include "parser/analyze.h"
 #include "parser/parse_agg.h"
 #include "parser/parse_coerce.h"
diff --git a/src/backend/optimizer/util/orclauses.c b/src/backend/optimizer/util/orclauses.c
index c62ba88..b671581 100644
--- a/src/backend/optimizer/util/orclauses.c
+++ b/src/backend/optimizer/util/orclauses.c
@@ -19,6 +19,7 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/orclauses.h"
 #include "optimizer/restrictinfo.h"
 
diff --git a/src/backend/optimizer/util/pathnode.c b/src/backend/optimizer/util/pathnode.c
index b2637d0..257f0bf 100644
--- a/src/backend/optimizer/util/pathnode.c
+++ b/src/backend/optimizer/util/pathnode.c
@@ -23,13 +23,13 @@
 #include "optimizer/appendinfo.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/planmain.h"
 #include "optimizer/prep.h"
 #include "optimizer/restrictinfo.h"
 #include "optimizer/tlist.h"
-#include "optimizer/var.h"
 #include "parser/parsetree.h"
 #include "utils/lsyscache.h"
 #include "utils/memutils.h"
diff --git a/src/backend/optimizer/util/placeholder.c b/src/backend/optimizer/util/placeholder.c
index b24478e..798aa8c 100644
--- a/src/backend/optimizer/util/placeholder.c
+++ b/src/backend/optimizer/util/placeholder.c
@@ -17,10 +17,10 @@
 
 #include "nodes/nodeFuncs.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/placeholder.h"
 #include "optimizer/planmain.h"
-#include "optimizer/var.h"
 #include "utils/lsyscache.h"
 
 /* Local functions */
diff --git a/src/backend/optimizer/util/plancat.c b/src/backend/optimizer/util/plancat.c
index 261492e..cb7f6f9 100644
--- a/src/backend/optimizer/util/plancat.c
+++ b/src/backend/optimizer/util/plancat.c
@@ -35,8 +35,8 @@
 #include "nodes/makefuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/plancat.h"
-#include "optimizer/predtest.h"
 #include "optimizer/prep.h"
 #include "partitioning/partbounds.h"
 #include "parser/parse_relation.h"
diff --git a/src/backend/optimizer/util/predtest.c b/src/backend/optimizer/util/predtest.c
index ecbb0db..3b260b1 100644
--- a/src/backend/optimizer/util/predtest.c
+++ b/src/backend/optimizer/util/predtest.c
@@ -21,8 +21,8 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/predtest.h"
+#include "nodes/relation.h"
+#include "optimizer/optimizer.h"
 #include "utils/array.h"
 #include "utils/inval.h"
 #include "utils/lsyscache.h"
diff --git a/src/backend/optimizer/util/restrictinfo.c b/src/backend/optimizer/util/restrictinfo.c
index c1bda81..1c47c70 100644
--- a/src/backend/optimizer/util/restrictinfo.c
+++ b/src/backend/optimizer/util/restrictinfo.c
@@ -17,8 +17,8 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 
 
 static RestrictInfo *make_restrictinfo_internal(Expr *clause,
diff --git a/src/backend/optimizer/util/tlist.c b/src/backend/optimizer/util/tlist.c
index d0cc14f..14d1c67 100644
--- a/src/backend/optimizer/util/tlist.c
+++ b/src/backend/optimizer/util/tlist.c
@@ -17,6 +17,7 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/tlist.h"
 
 
diff --git a/src/backend/optimizer/util/var.c b/src/backend/optimizer/util/var.c
index 5116d7f..315c81e 100644
--- a/src/backend/optimizer/util/var.c
+++ b/src/backend/optimizer/util/var.c
@@ -22,8 +22,8 @@
 
 #include "access/sysattr.h"
 #include "nodes/nodeFuncs.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/prep.h"
-#include "optimizer/var.h"
 #include "parser/parsetree.h"
 #include "rewrite/rewriteManip.h"
 
diff --git a/src/backend/parser/analyze.c b/src/backend/parser/analyze.c
index 8f96558..f8dd8ac 100644
--- a/src/backend/parser/analyze.c
+++ b/src/backend/parser/analyze.c
@@ -29,7 +29,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/analyze.h"
 #include "parser/parse_agg.h"
 #include "parser/parse_clause.h"
diff --git a/src/backend/parser/parse_agg.c b/src/backend/parser/parse_agg.c
index 5b73378..183ea0f 100644
--- a/src/backend/parser/parse_agg.c
+++ b/src/backend/parser/parse_agg.c
@@ -19,8 +19,7 @@
 #include "catalog/pg_type.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/tlist.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_agg.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_coerce.h"
diff --git a/src/backend/parser/parse_clause.c b/src/backend/parser/parse_clause.c
index 8805543..c6ce101 100644
--- a/src/backend/parser/parse_clause.c
+++ b/src/backend/parser/parse_clause.c
@@ -31,8 +31,7 @@
 #include "commands/defrem.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/tlist.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/analyze.h"
 #include "parser/parsetree.h"
 #include "parser/parser.h"
diff --git a/src/backend/parser/parse_expr.c b/src/backend/parser/parse_expr.c
index 3e0a762..7fc8d63 100644
--- a/src/backend/parser/parse_expr.c
+++ b/src/backend/parser/parse_expr.c
@@ -20,8 +20,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/tlist.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/analyze.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_coerce.h"
diff --git a/src/backend/parser/parse_utilcmd.c b/src/backend/parser/parse_utilcmd.c
index 445e81a..a37d1f1 100644
--- a/src/backend/parser/parse_utilcmd.c
+++ b/src/backend/parser/parse_utilcmd.c
@@ -50,9 +50,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "parser/analyze.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_coerce.h"
diff --git a/src/backend/partitioning/partbounds.c b/src/backend/partitioning/partbounds.c
index f21c9b3..d478ae7 100644
--- a/src/backend/partitioning/partbounds.c
+++ b/src/backend/partitioning/partbounds.c
@@ -22,7 +22,6 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
 #include "parser/parse_coerce.h"
 #include "partitioning/partprune.h"
 #include "partitioning/partbounds.h"
diff --git a/src/backend/partitioning/partprune.c b/src/backend/partitioning/partprune.c
index f5155fe..8c97219 100644
--- a/src/backend/partitioning/partprune.c
+++ b/src/backend/partitioning/partprune.c
@@ -45,12 +45,8 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "optimizer/appendinfo.h"
-#include "optimizer/clauses.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
-#include "optimizer/planner.h"
-#include "optimizer/predtest.h"
-#include "optimizer/prep.h"
-#include "optimizer/var.h"
 #include "partitioning/partprune.h"
 #include "partitioning/partbounds.h"
 #include "rewrite/rewriteManip.h"
diff --git a/src/backend/replication/logical/worker.c b/src/backend/replication/logical/worker.c
index 2c49c71..f951651 100644
--- a/src/backend/replication/logical/worker.c
+++ b/src/backend/replication/logical/worker.c
@@ -23,61 +23,46 @@
 
 #include "postgres.h"
 
-#include "miscadmin.h"
-#include "pgstat.h"
-#include "funcapi.h"
-
 #include "access/table.h"
 #include "access/xact.h"
 #include "access/xlog_internal.h"
-
 #include "catalog/catalog.h"
 #include "catalog/namespace.h"
 #include "catalog/pg_subscription.h"
 #include "catalog/pg_subscription_rel.h"
-
 #include "commands/tablecmds.h"
 #include "commands/trigger.h"
-
 #include "executor/executor.h"
 #include "executor/nodeModifyTable.h"
-
+#include "funcapi.h"
 #include "libpq/pqformat.h"
 #include "libpq/pqsignal.h"
-
 #include "mb/pg_wchar.h"
-
+#include "miscadmin.h"
 #include "nodes/makefuncs.h"
-
-#include "optimizer/planner.h"
-
+#include "optimizer/optimizer.h"
 #include "parser/parse_relation.h"
-
+#include "pgstat.h"
 #include "postmaster/bgworker.h"
 #include "postmaster/postmaster.h"
 #include "postmaster/walwriter.h"
-
 #include "replication/decode.h"
 #include "replication/logical.h"
 #include "replication/logicalproto.h"
 #include "replication/logicalrelation.h"
 #include "replication/logicalworker.h"
-#include "replication/reorderbuffer.h"
 #include "replication/origin.h"
+#include "replication/reorderbuffer.h"
 #include "replication/snapbuild.h"
 #include "replication/walreceiver.h"
 #include "replication/worker_internal.h"
-
 #include "rewrite/rewriteHandler.h"
-
 #include "storage/bufmgr.h"
 #include "storage/ipc.h"
 #include "storage/lmgr.h"
 #include "storage/proc.h"
 #include "storage/procarray.h"
-
 #include "tcop/tcopprot.h"
-
 #include "utils/builtins.h"
 #include "utils/catcache.h"
 #include "utils/datum.h"
@@ -87,8 +72,8 @@
 #include "utils/lsyscache.h"
 #include "utils/memutils.h"
 #include "utils/rel.h"
-#include "utils/timeout.h"
 #include "utils/syscache.h"
+#include "utils/timeout.h"
 
 #define NAPTIME_PER_CYCLE 1000	/* max sleep time between cycles (1s) */
 
diff --git a/src/backend/rewrite/rewriteManip.c b/src/backend/rewrite/rewriteManip.c
index fd7a751..57aee3d 100644
--- a/src/backend/rewrite/rewriteManip.c
+++ b/src/backend/rewrite/rewriteManip.c
@@ -17,7 +17,7 @@
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "nodes/plannodes.h"
-#include "optimizer/clauses.h"
+#include "nodes/relation.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_relation.h"
 #include "parser/parsetree.h"
diff --git a/src/backend/statistics/dependencies.c b/src/backend/statistics/dependencies.c
index a8e9f72..13492ce 100644
--- a/src/backend/statistics/dependencies.c
+++ b/src/backend/statistics/dependencies.c
@@ -20,8 +20,7 @@
 #include "lib/stringinfo.h"
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
-#include "optimizer/cost.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "nodes/nodes.h"
 #include "nodes/relation.h"
 #include "statistics/extended_stats_internal.h"
diff --git a/src/backend/tcop/postgres.c b/src/backend/tcop/postgres.c
index e773f20..36cfd50 100644
--- a/src/backend/tcop/postgres.c
+++ b/src/backend/tcop/postgres.c
@@ -49,7 +49,7 @@
 #include "libpq/pqsignal.h"
 #include "miscadmin.h"
 #include "nodes/print.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "pgstat.h"
 #include "pg_trace.h"
 #include "parser/analyze.h"
diff --git a/src/backend/utils/adt/array_selfuncs.c b/src/backend/utils/adt/array_selfuncs.c
index ad1201a..870131b 100644
--- a/src/backend/utils/adt/array_selfuncs.c
+++ b/src/backend/utils/adt/array_selfuncs.c
@@ -20,7 +20,6 @@
 #include "catalog/pg_collation.h"
 #include "catalog/pg_operator.h"
 #include "catalog/pg_statistic.h"
-#include "optimizer/clauses.h"
 #include "utils/array.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
diff --git a/src/backend/utils/adt/orderedsetaggs.c b/src/backend/utils/adt/orderedsetaggs.c
index 6075bc3..2d384a9 100644
--- a/src/backend/utils/adt/orderedsetaggs.c
+++ b/src/backend/utils/adt/orderedsetaggs.c
@@ -22,7 +22,7 @@
 #include "executor/executor.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/tlist.h"
+#include "optimizer/optimizer.h"
 #include "utils/array.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
diff --git a/src/backend/utils/adt/ruleutils.c b/src/backend/utils/adt/ruleutils.c
index 302df16..09bc7e6 100644
--- a/src/backend/utils/adt/ruleutils.c
+++ b/src/backend/utils/adt/ruleutils.c
@@ -49,7 +49,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/tlist.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_node.h"
 #include "parser/parse_agg.h"
 #include "parser/parse_func.h"
diff --git a/src/backend/utils/adt/selfuncs.c b/src/backend/utils/adt/selfuncs.c
index 4af8c80..fb00504 100644
--- a/src/backend/utils/adt/selfuncs.c
+++ b/src/backend/utils/adt/selfuncs.c
@@ -121,12 +121,11 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/clauses.h"
 #include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/pathnode.h"
 #include "optimizer/paths.h"
 #include "optimizer/plancat.h"
-#include "optimizer/predtest.h"
 #include "optimizer/restrictinfo.h"
-#include "optimizer/var.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_coerce.h"
 #include "parser/parsetree.h"
diff --git a/src/backend/utils/cache/partcache.c b/src/backend/utils/cache/partcache.c
index 2404073..1b50f28 100644
--- a/src/backend/utils/cache/partcache.c
+++ b/src/backend/utils/cache/partcache.c
@@ -25,8 +25,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "partitioning/partbounds.h"
 #include "utils/builtins.h"
 #include "utils/datum.h"
diff --git a/src/backend/utils/cache/plancache.c b/src/backend/utils/cache/plancache.c
index 3f46b5d..9851bd4 100644
--- a/src/backend/utils/cache/plancache.c
+++ b/src/backend/utils/cache/plancache.c
@@ -61,10 +61,7 @@
 #include "executor/executor.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/cost.h"
-#include "optimizer/planmain.h"
-#include "optimizer/planner.h"
-#include "optimizer/prep.h"
+#include "optimizer/optimizer.h"
 #include "parser/analyze.h"
 #include "parser/parsetree.h"
 #include "storage/lmgr.h"
diff --git a/src/backend/utils/cache/relcache.c b/src/backend/utils/cache/relcache.c
index 12bba1b..af96a03 100644
--- a/src/backend/utils/cache/relcache.c
+++ b/src/backend/utils/cache/relcache.c
@@ -71,9 +71,7 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/prep.h"
-#include "optimizer/var.h"
+#include "optimizer/optimizer.h"
 #include "partitioning/partbounds.h"
 #include "rewrite/rewriteDefine.h"
 #include "rewrite/rowsecurity.h"
diff --git a/src/backend/utils/cache/spccache.c b/src/backend/utils/cache/spccache.c
index 1d0c16b..6309a01 100644
--- a/src/backend/utils/cache/spccache.c
+++ b/src/backend/utils/cache/spccache.c
@@ -22,7 +22,7 @@
 #include "catalog/pg_tablespace.h"
 #include "commands/tablespace.h"
 #include "miscadmin.h"
-#include "optimizer/cost.h"
+#include "optimizer/optimizer.h"
 #include "storage/bufmgr.h"
 #include "utils/catcache.h"
 #include "utils/hsearch.h"
diff --git a/src/backend/utils/cache/typcache.c b/src/backend/utils/cache/typcache.c
index 2fb7dd3..7857424 100644
--- a/src/backend/utils/cache/typcache.c
+++ b/src/backend/utils/cache/typcache.c
@@ -59,7 +59,7 @@
 #include "commands/defrem.h"
 #include "executor/executor.h"
 #include "lib/dshash.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "storage/lwlock.h"
 #include "utils/builtins.h"
 #include "utils/catcache.h"
diff --git a/src/backend/utils/misc/guc.c b/src/backend/utils/misc/guc.c
index c216ed0..98d75be 100644
--- a/src/backend/utils/misc/guc.c
+++ b/src/backend/utils/misc/guc.c
@@ -50,6 +50,7 @@
 #include "miscadmin.h"
 #include "optimizer/cost.h"
 #include "optimizer/geqo.h"
+#include "optimizer/optimizer.h"
 #include "optimizer/paths.h"
 #include "optimizer/planmain.h"
 #include "parser/parse_expr.h"
diff --git a/src/include/nodes/relation.h b/src/include/nodes/relation.h
index 3430061..366b0a6 100644
--- a/src/include/nodes/relation.h
+++ b/src/include/nodes/relation.h
@@ -159,11 +159,17 @@ typedef struct PlannerGlobal
  * It holds links to all of the planner's working state, in addition to the
  * original Query.  Note that at present the planner extensively modifies
  * the passed-in Query data structure; someday that should stop.
+ *
+ * For reasons explained in optimizer/optimizer.h, we define the typedef
+ * either here or in that header, whichever is read first.
  *----------
  */
-struct AppendRelInfo;
+#ifndef HAVE_PLANNERINFO_TYPEDEF
+typedef struct PlannerInfo PlannerInfo;
+#define HAVE_PLANNERINFO_TYPEDEF 1
+#endif
 
-typedef struct PlannerInfo
+struct PlannerInfo
 {
 	NodeTag		type;
 
@@ -173,7 +179,7 @@ typedef struct PlannerInfo
 
 	Index		query_level;	/* 1 at the outermost Query */
 
-	struct PlannerInfo *parent_root;	/* NULL at outermost Query */
+	PlannerInfo *parent_root;	/* NULL at outermost Query */
 
 	/*
 	 * plan_params contains the expressions that this query level needs to
@@ -343,7 +349,7 @@ typedef struct PlannerInfo
 
 	/* Does this query modify any partition key columns? */
 	bool		partColsUpdated;
-} PlannerInfo;
+};
 
 
 /*
@@ -2066,8 +2072,12 @@ typedef struct PlaceHolderVar
  * plain innerjoin semantics.  Note that lhs_strict, delay_upper_joins, and
  * of course the semi_xxx fields are not set meaningfully within such structs.
  */
+#ifndef HAVE_SPECIALJOININFO_TYPEDEF
+typedef struct SpecialJoinInfo SpecialJoinInfo;
+#define HAVE_SPECIALJOININFO_TYPEDEF 1
+#endif
 
-typedef struct SpecialJoinInfo
+struct SpecialJoinInfo
 {
 	NodeTag		type;
 	Relids		min_lefthand;	/* base relids in minimum LHS for join */
@@ -2082,7 +2092,7 @@ typedef struct SpecialJoinInfo
 	bool		semi_can_hash;	/* true if semi_operators are all hash */
 	List	   *semi_operators; /* OIDs of equality join operators */
 	List	   *semi_rhs_exprs; /* righthand-side expressions of these ops */
-} SpecialJoinInfo;
+};
 
 /*
  * Append-relation info.
diff --git a/src/include/optimizer/clauses.h b/src/include/optimizer/clauses.h
index 3f53428..cfedd42 100644
--- a/src/include/optimizer/clauses.h
+++ b/src/include/optimizer/clauses.h
@@ -35,9 +35,6 @@ extern double expression_returns_set_rows(Node *clause);
 
 extern bool contain_subplans(Node *clause);
 
-extern bool contain_mutable_functions(Node *clause);
-extern bool contain_volatile_functions(Node *clause);
-extern bool contain_volatile_functions_not_nextval(Node *clause);
 extern char max_parallel_hazard(Query *parse);
 extern bool is_parallel_safe(PlannerInfo *root, Node *node);
 extern bool contain_nonstrict_functions(Node *clause);
@@ -56,17 +53,7 @@ extern int	NumRelids(Node *clause);
 extern void CommuteOpExpr(OpExpr *clause);
 extern void CommuteRowCompareExpr(RowCompareExpr *clause);
 
-extern Node *eval_const_expressions(PlannerInfo *root, Node *node);
-
-extern Node *estimate_expression_value(PlannerInfo *root, Node *node);
-
-extern Expr *evaluate_expr(Expr *expr, Oid result_type, int32 result_typmod,
-						   Oid result_collation);
-
 extern Query *inline_set_returning_function(PlannerInfo *root,
 							  RangeTblEntry *rte);
 
-extern List *expand_function_arguments(List *args, Oid result_type,
-						  HeapTuple func_tuple);
-
 #endif							/* CLAUSES_H */
diff --git a/src/include/optimizer/cost.h b/src/include/optimizer/cost.h
index e7005b4..d5912e3 100644
--- a/src/include/optimizer/cost.h
+++ b/src/include/optimizer/cost.h
@@ -44,15 +44,7 @@ typedef enum
  *	  routines to compute costs and sizes
  */
 
-/* parameter variables and flags */
-extern PGDLLIMPORT double seq_page_cost;
-extern PGDLLIMPORT double random_page_cost;
-extern PGDLLIMPORT double cpu_tuple_cost;
-extern PGDLLIMPORT double cpu_index_tuple_cost;
-extern PGDLLIMPORT double cpu_operator_cost;
-extern PGDLLIMPORT double parallel_tuple_cost;
-extern PGDLLIMPORT double parallel_setup_cost;
-extern PGDLLIMPORT int effective_cache_size;
+/* parameter variables and flags (see also optimizer.h) */
 extern PGDLLIMPORT Cost disable_cost;
 extern PGDLLIMPORT int max_parallel_workers_per_gather;
 extern PGDLLIMPORT bool enable_seqscan;
@@ -74,7 +66,6 @@ extern PGDLLIMPORT bool enable_parallel_hash;
 extern PGDLLIMPORT bool enable_partition_pruning;
 extern PGDLLIMPORT int constraint_exclusion;
 
-extern double clamp_row_est(double nrows);
 extern double index_pages_fetched(double tuples_fetched, BlockNumber pages,
 					double index_pages, PlannerInfo *root);
 extern void cost_seqscan(Path *path, PlannerInfo *root, RelOptInfo *baserel,
@@ -163,6 +154,10 @@ extern void final_cost_hashjoin(PlannerInfo *root, HashPath *path,
 					JoinPathExtraData *extra);
 extern void cost_gather(GatherPath *path, PlannerInfo *root,
 			RelOptInfo *baserel, ParamPathInfo *param_info, double *rows);
+extern void cost_gather_merge(GatherMergePath *path, PlannerInfo *root,
+				  RelOptInfo *rel, ParamPathInfo *param_info,
+				  Cost input_startup_cost, Cost input_total_cost,
+				  double *rows);
 extern void cost_subplan(PlannerInfo *root, SubPlan *subplan, Plan *plan);
 extern void cost_qual_eval(QualCost *cost, List *quals, PlannerInfo *root);
 extern void cost_qual_eval_node(QualCost *cost, Node *qual, PlannerInfo *root);
@@ -201,23 +196,4 @@ extern PathTarget *set_pathtarget_cost_width(PlannerInfo *root, PathTarget *targ
 extern double compute_bitmap_pages(PlannerInfo *root, RelOptInfo *baserel,
 					 Path *bitmapqual, int loop_count, Cost *cost, double *tuple);
 
-/*
- * prototypes for clausesel.c
- *	  routines to compute clause selectivities
- */
-extern Selectivity clauselist_selectivity(PlannerInfo *root,
-					   List *clauses,
-					   int varRelid,
-					   JoinType jointype,
-					   SpecialJoinInfo *sjinfo);
-extern Selectivity clause_selectivity(PlannerInfo *root,
-				   Node *clause,
-				   int varRelid,
-				   JoinType jointype,
-				   SpecialJoinInfo *sjinfo);
-extern void cost_gather_merge(GatherMergePath *path, PlannerInfo *root,
-				  RelOptInfo *rel, ParamPathInfo *param_info,
-				  Cost input_startup_cost, Cost input_total_cost,
-				  double *rows);
-
 #endif							/* COST_H */
diff --git a/src/include/optimizer/optimizer.h b/src/include/optimizer/optimizer.h
index e69de29..1cd5c80 100644
--- a/src/include/optimizer/optimizer.h
+++ b/src/include/optimizer/optimizer.h
@@ -0,0 +1,175 @@
+/*-------------------------------------------------------------------------
+ *
+ * optimizer.h
+ *	  External API for the Postgres planner.
+ *
+ * This header is meant to define everything that the core planner
+ * exposes for use by non-planner modules.
+ *
+ * Note that there are files outside src/backend/optimizer/ that are
+ * considered planner modules, because they're too much in bed with
+ * planner operations to be treated otherwise.  FDW planning code is an
+ * example.  For the most part, however, code outside the core planner
+ * should not need to include any optimizer/ header except this one.
+ *
+ * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
+ * Portions Copyright (c) 1994, Regents of the University of California
+ *
+ * src/include/optimizer/optimizer.h
+ *
+ *-------------------------------------------------------------------------
+ */
+#ifndef OPTIMIZER_H
+#define OPTIMIZER_H
+
+#include "nodes/parsenodes.h"
+
+/*
+ * We don't want to include nodes/relation.h here, because non-planner
+ * code should generally treat PlannerInfo as an opaque typedef.
+ * But we'd like such code to use that typedef name, so define the
+ * typedef either here or in relation.h, whichever is read first.
+ */
+#ifndef HAVE_PLANNERINFO_TYPEDEF
+typedef struct PlannerInfo PlannerInfo;
+#define HAVE_PLANNERINFO_TYPEDEF 1
+#endif
+
+/* Likewise for SpecialJoinInfo. */
+#ifndef HAVE_SPECIALJOININFO_TYPEDEF
+typedef struct SpecialJoinInfo SpecialJoinInfo;
+#define HAVE_SPECIALJOININFO_TYPEDEF 1
+#endif
+
+/* It also seems best not to include plannodes.h, params.h, or htup.h here */
+struct PlannedStmt;
+struct ParamListInfoData;
+struct HeapTupleData;
+
+
+/* in path/clausesel.c: */
+
+extern Selectivity clause_selectivity(PlannerInfo *root,
+				   Node *clause,
+				   int varRelid,
+				   JoinType jointype,
+				   SpecialJoinInfo *sjinfo);
+extern Selectivity clauselist_selectivity(PlannerInfo *root,
+					   List *clauses,
+					   int varRelid,
+					   JoinType jointype,
+					   SpecialJoinInfo *sjinfo);
+
+/* in path/costsize.c: */
+
+/* widely used cost parameters */
+extern PGDLLIMPORT double seq_page_cost;
+extern PGDLLIMPORT double random_page_cost;
+extern PGDLLIMPORT double cpu_tuple_cost;
+extern PGDLLIMPORT double cpu_index_tuple_cost;
+extern PGDLLIMPORT double cpu_operator_cost;
+extern PGDLLIMPORT double parallel_tuple_cost;
+extern PGDLLIMPORT double parallel_setup_cost;
+extern PGDLLIMPORT int effective_cache_size;
+
+extern double clamp_row_est(double nrows);
+
+/* in plan/planner.c: */
+
+/* possible values for force_parallel_mode */
+typedef enum
+{
+	FORCE_PARALLEL_OFF,
+	FORCE_PARALLEL_ON,
+	FORCE_PARALLEL_REGRESS
+}			ForceParallelMode;
+
+/* GUC parameters */
+extern int	force_parallel_mode;
+extern bool parallel_leader_participation;
+
+extern struct PlannedStmt *planner(Query *parse, int cursorOptions,
+		struct ParamListInfoData *boundParams);
+
+extern Expr *expression_planner(Expr *expr);
+extern Expr *expression_planner_with_deps(Expr *expr,
+							 List **relationOids,
+							 List **invalItems);
+
+extern bool plan_cluster_use_sort(Oid tableOid, Oid indexOid);
+extern int	plan_create_index_workers(Oid tableOid, Oid indexOid);
+
+/* in plan/setrefs.c: */
+
+extern void extract_query_dependencies(Node *query,
+						   List **relationOids,
+						   List **invalItems,
+						   bool *hasRowSecurity);
+
+/* in prep/prepqual.c: */
+
+extern Node *negate_clause(Node *node);
+extern Expr *canonicalize_qual(Expr *qual, bool is_check);
+
+/* in util/clauses.c: */
+
+extern bool contain_mutable_functions(Node *clause);
+extern bool contain_volatile_functions(Node *clause);
+extern bool contain_volatile_functions_not_nextval(Node *clause);
+
+extern Node *eval_const_expressions(PlannerInfo *root, Node *node);
+
+extern Node *estimate_expression_value(PlannerInfo *root, Node *node);
+
+extern Expr *evaluate_expr(Expr *expr, Oid result_type, int32 result_typmod,
+			  Oid result_collation);
+
+extern List *expand_function_arguments(List *args, Oid result_type,
+						  struct HeapTupleData *func_tuple);
+
+/* in util/predtest.c: */
+
+extern bool predicate_implied_by(List *predicate_list, List *clause_list,
+					 bool weak);
+extern bool predicate_refuted_by(List *predicate_list, List *clause_list,
+					 bool weak);
+
+/* in util/tlist.c: */
+
+extern int	count_nonjunk_tlist_entries(List *tlist);
+extern TargetEntry *get_sortgroupref_tle(Index sortref,
+					 List *targetList);
+extern TargetEntry *get_sortgroupclause_tle(SortGroupClause *sgClause,
+						List *targetList);
+extern Node *get_sortgroupclause_expr(SortGroupClause *sgClause,
+						 List *targetList);
+extern List *get_sortgrouplist_exprs(List *sgClauses,
+						List *targetList);
+extern SortGroupClause *get_sortgroupref_clause(Index sortref,
+						List *clauses);
+extern SortGroupClause *get_sortgroupref_clause_noerr(Index sortref,
+							  List *clauses);
+
+/* in util/var.c: */
+
+/* Bits that can be OR'd into the flags argument of pull_var_clause() */
+#define PVC_INCLUDE_AGGREGATES	0x0001	/* include Aggrefs in output list */
+#define PVC_RECURSE_AGGREGATES	0x0002	/* recurse into Aggref arguments */
+#define PVC_INCLUDE_WINDOWFUNCS 0x0004	/* include WindowFuncs in output list */
+#define PVC_RECURSE_WINDOWFUNCS 0x0008	/* recurse into WindowFunc arguments */
+#define PVC_INCLUDE_PLACEHOLDERS	0x0010	/* include PlaceHolderVars in
+											 * output list */
+#define PVC_RECURSE_PLACEHOLDERS	0x0020	/* recurse into PlaceHolderVar
+											 * arguments */
+
+extern Bitmapset *pull_varnos(Node *node);
+extern Bitmapset *pull_varnos_of_level(Node *node, int levelsup);
+extern void pull_varattnos(Node *node, Index varno, Bitmapset **varattnos);
+extern List *pull_vars_of_level(Node *node, int levelsup);
+extern bool contain_var_clause(Node *node);
+extern bool contain_vars_of_level(Node *node, int levelsup);
+extern int	locate_var_of_level(Node *node, int levelsup);
+extern List *pull_var_clause(Node *node, int flags);
+extern Node *flatten_join_alias_vars(Query *query, Node *node);
+
+#endif							/* OPTIMIZER_H */
diff --git a/src/include/optimizer/planmain.h b/src/include/optimizer/planmain.h
index bec0c38..b2e1c07 100644
--- a/src/include/optimizer/planmain.h
+++ b/src/include/optimizer/planmain.h
@@ -17,19 +17,9 @@
 #include "nodes/plannodes.h"
 #include "nodes/relation.h"
 
-/* possible values for force_parallel_mode */
-typedef enum
-{
-	FORCE_PARALLEL_OFF,
-	FORCE_PARALLEL_ON,
-	FORCE_PARALLEL_REGRESS
-}			ForceParallelMode;
-
 /* GUC parameters */
 #define DEFAULT_CURSOR_TUPLE_FRACTION 0.1
 extern double cursor_tuple_fraction;
-extern int	force_parallel_mode;
-extern bool parallel_leader_participation;
 
 /* query_planner callback to compute query_pathkeys */
 typedef void (*query_pathkeys_callback) (PlannerInfo *root, void *extra);
@@ -119,10 +109,6 @@ extern bool innerrel_is_unique(PlannerInfo *root,
 extern Plan *set_plan_references(PlannerInfo *root, Plan *plan);
 extern void record_plan_function_dependency(PlannerInfo *root, Oid funcid);
 extern void record_plan_type_dependency(PlannerInfo *root, Oid typid);
-extern void extract_query_dependencies(Node *query,
-						   List **relationOids,
-						   List **invalItems,
-						   bool *hasRowSecurity);
 extern bool extract_query_dependencies_walker(Node *node, PlannerInfo *root);
 
 #endif							/* PLANMAIN_H */
diff --git a/src/include/optimizer/planner.h b/src/include/optimizer/planner.h
index 8616681..769a2f8 100644
--- a/src/include/optimizer/planner.h
+++ b/src/include/optimizer/planner.h
@@ -3,6 +3,10 @@
  * planner.h
  *	  prototypes for planner.c.
  *
+ * Note that the primary entry points for planner.c are declared in
+ * optimizer/optimizer.h, because they're intended to be called from
+ * non-planner code.  Declarations here are meant for use by other
+ * planner modules.
  *
  * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
  * Portions Copyright (c) 1994, Regents of the University of California
@@ -33,8 +37,6 @@ typedef void (*create_upper_paths_hook_type) (PlannerInfo *root,
 extern PGDLLIMPORT create_upper_paths_hook_type create_upper_paths_hook;
 
 
-extern PlannedStmt *planner(Query *parse, int cursorOptions,
-		ParamListInfo boundParams);
 extern PlannedStmt *standard_planner(Query *parse, int cursorOptions,
 				 ParamListInfo boundParams);
 
@@ -54,14 +56,6 @@ extern void mark_partial_aggref(Aggref *agg, AggSplit aggsplit);
 extern Path *get_cheapest_fractional_path(RelOptInfo *rel,
 							 double tuple_fraction);
 
-extern Expr *expression_planner(Expr *expr);
-extern Expr *expression_planner_with_deps(Expr *expr,
-							 List **relationOids,
-							 List **invalItems);
-
 extern Expr *preprocess_phv_expression(PlannerInfo *root, Expr *expr);
 
-extern bool plan_cluster_use_sort(Oid tableOid, Oid indexOid);
-extern int	plan_create_index_workers(Oid tableOid, Oid indexOid);
-
 #endif							/* PLANNER_H */
diff --git a/src/include/optimizer/predtest.h b/src/include/optimizer/predtest.h
index d5abe79..e69de29 100644
--- a/src/include/optimizer/predtest.h
+++ b/src/include/optimizer/predtest.h
@@ -1,25 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * predtest.h
- *	  prototypes for predtest.c
- *
- *
- * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * src/include/optimizer/predtest.h
- *
- *-------------------------------------------------------------------------
- */
-#ifndef PREDTEST_H
-#define PREDTEST_H
-
-#include "nodes/primnodes.h"
-
-
-extern bool predicate_implied_by(List *predicate_list, List *clause_list,
-					 bool weak);
-extern bool predicate_refuted_by(List *predicate_list, List *clause_list,
-					 bool weak);
-
-#endif							/* PREDTEST_H */
diff --git a/src/include/optimizer/prep.h b/src/include/optimizer/prep.h
index 3ad8dcb..9a7a584 100644
--- a/src/include/optimizer/prep.h
+++ b/src/include/optimizer/prep.h
@@ -30,12 +30,6 @@ extern Relids get_relids_in_jointree(Node *jtnode, bool include_joins);
 extern Relids get_relids_for_join(Query *query, int joinrelid);
 
 /*
- * prototypes for prepqual.c
- */
-extern Node *negate_clause(Node *node);
-extern Expr *canonicalize_qual(Expr *qual, bool is_check);
-
-/*
  * prototypes for preptlist.c
  */
 extern List *preprocess_targetlist(PlannerInfo *root);
diff --git a/src/include/optimizer/tlist.h b/src/include/optimizer/tlist.h
index 8b967f9..13ac7b8 100644
--- a/src/include/optimizer/tlist.h
+++ b/src/include/optimizer/tlist.h
@@ -24,8 +24,6 @@ extern List *add_to_flat_tlist(List *tlist, List *exprs);
 
 extern List *get_tlist_exprs(List *tlist, bool includeJunk);
 
-extern int	count_nonjunk_tlist_entries(List *tlist);
-
 extern bool tlist_same_exprs(List *tlist1, List *tlist2);
 
 extern bool tlist_same_datatypes(List *tlist, List *colTypes, bool junkOK);
@@ -33,20 +31,6 @@ extern bool tlist_same_collations(List *tlist, List *colCollations, bool junkOK)
 
 extern void apply_tlist_labeling(List *dest_tlist, List *src_tlist);
 
-extern TargetEntry *get_sortgroupref_tle(Index sortref,
-					 List *targetList);
-extern TargetEntry *get_sortgroupclause_tle(SortGroupClause *sgClause,
-						List *targetList);
-extern Node *get_sortgroupclause_expr(SortGroupClause *sgClause,
-						 List *targetList);
-extern List *get_sortgrouplist_exprs(List *sgClauses,
-						List *targetList);
-
-extern SortGroupClause *get_sortgroupref_clause(Index sortref,
-						List *clauses);
-extern SortGroupClause *get_sortgroupref_clause_noerr(Index sortref,
-							  List *clauses);
-
 extern Oid *extract_grouping_ops(List *groupClause);
 extern AttrNumber *extract_grouping_cols(List *groupClause, List *tlist);
 extern bool grouping_is_sortable(List *groupClause);
diff --git a/src/include/optimizer/var.h b/src/include/optimizer/var.h
index f975074..e69de29 100644
--- a/src/include/optimizer/var.h
+++ b/src/include/optimizer/var.h
@@ -1,40 +0,0 @@
-/*-------------------------------------------------------------------------
- *
- * var.h
- *	  prototypes for optimizer/util/var.c.
- *
- *
- * Portions Copyright (c) 1996-2019, PostgreSQL Global Development Group
- * Portions Copyright (c) 1994, Regents of the University of California
- *
- * src/include/optimizer/var.h
- *
- *-------------------------------------------------------------------------
- */
-#ifndef VAR_H
-#define VAR_H
-
-#include "nodes/relation.h"
-
-/* Bits that can be OR'd into the flags argument of pull_var_clause() */
-#define PVC_INCLUDE_AGGREGATES	0x0001	/* include Aggrefs in output list */
-#define PVC_RECURSE_AGGREGATES	0x0002	/* recurse into Aggref arguments */
-#define PVC_INCLUDE_WINDOWFUNCS 0x0004	/* include WindowFuncs in output list */
-#define PVC_RECURSE_WINDOWFUNCS 0x0008	/* recurse into WindowFunc arguments */
-#define PVC_INCLUDE_PLACEHOLDERS	0x0010	/* include PlaceHolderVars in
-											 * output list */
-#define PVC_RECURSE_PLACEHOLDERS	0x0020	/* recurse into PlaceHolderVar
-											 * arguments */
-
-
-extern Relids pull_varnos(Node *node);
-extern Relids pull_varnos_of_level(Node *node, int levelsup);
-extern void pull_varattnos(Node *node, Index varno, Bitmapset **varattnos);
-extern List *pull_vars_of_level(Node *node, int levelsup);
-extern bool contain_var_clause(Node *node);
-extern bool contain_vars_of_level(Node *node, int levelsup);
-extern int	locate_var_of_level(Node *node, int levelsup);
-extern List *pull_var_clause(Node *node, int flags);
-extern Node *flatten_join_alias_vars(Query *query, Node *node);
-
-#endif							/* VAR_H */
diff --git a/src/pl/plpgsql/src/pl_exec.c b/src/pl/plpgsql/src/pl_exec.c
index 45f10f9..85aa613 100644
--- a/src/pl/plpgsql/src/pl_exec.c
+++ b/src/pl/plpgsql/src/pl_exec.c
@@ -30,8 +30,7 @@
 #include "funcapi.h"
 #include "miscadmin.h"
 #include "nodes/nodeFuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/planner.h"
+#include "optimizer/optimizer.h"
 #include "parser/parse_coerce.h"
 #include "parser/scansup.h"
 #include "storage/proc.h"
diff --git a/src/test/modules/test_predtest/test_predtest.c b/src/test/modules/test_predtest/test_predtest.c
index c03748c..10cd4f9 100644
--- a/src/test/modules/test_predtest/test_predtest.c
+++ b/src/test/modules/test_predtest/test_predtest.c
@@ -18,8 +18,7 @@
 #include "executor/spi.h"
 #include "funcapi.h"
 #include "nodes/makefuncs.h"
-#include "optimizer/clauses.h"
-#include "optimizer/predtest.h"
+#include "optimizer/optimizer.h"
 #include "utils/builtins.h"
 
 PG_MODULE_MAGIC;