Make the order of the header file includes consistent in backend modules.

Similar to commits 7e735035f2 and dddf4cdc33, this commit makes the order
of header file inclusion consistent for backend modules.

In the passing, removed a couple of duplicate inclusions.

Author: Vignesh C
Reviewed-by: Kuntal Ghosh and Amit Kapila
Discussion: https://postgr.es/m/CALDaNm2Sznv8RR6Ex-iJO6xAdsxgWhCoETkaYX=+9DW3q0QCfA@mail.gmail.com

src/backend/parser/parse_clause.c

@@ -15,8 +15,6 @@
 
 #include "postgres.h"
 
-#include "miscadmin.h"
-
 #include "access/htup_details.h"
 #include "access/nbtree.h"
 #include "access/table.h"
@@ -29,12 +27,11 @@
 #include "catalog/pg_constraint.h"
 #include "catalog/pg_type.h"
 #include "commands/defrem.h"
+#include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
 #include "optimizer/optimizer.h"
 #include "parser/analyze.h"
-#include "parser/parsetree.h"
-#include "parser/parser.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
@@ -44,14 +41,15 @@
 #include "parser/parse_relation.h"
 #include "parser/parse_target.h"
 #include "parser/parse_type.h"
+#include "parser/parser.h"
+#include "parser/parsetree.h"
 #include "rewrite/rewriteManip.h"
 #include "utils/builtins.h"
-#include "utils/guc.h"
 #include "utils/catcache.h"
+#include "utils/guc.h"
 #include "utils/lsyscache.h"
-#include "utils/syscache.h"
 #include "utils/rel.h"
-
+#include "utils/syscache.h"
 
 /* Convenience macro for the most common makeNamespaceItem() case */
 #define makeDefaultNSItem(rte)	makeNamespaceItem(rte, true, true, false, true)

src/backend/parser/parse_expr.c

@@ -22,6 +22,7 @@
 #include "nodes/nodeFuncs.h"
 #include "optimizer/optimizer.h"
 #include "parser/analyze.h"
+#include "parser/parse_agg.h"
 #include "parser/parse_clause.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_collate.h"
@@ -31,14 +32,12 @@
 #include "parser/parse_relation.h"
 #include "parser/parse_target.h"
 #include "parser/parse_type.h"
-#include "parser/parse_agg.h"
 #include "utils/builtins.h"
 #include "utils/date.h"
 #include "utils/lsyscache.h"
 #include "utils/timestamp.h"
 #include "utils/xml.h"
 
-
 /* GUC parameters */
 bool		operator_precedence_warning = false;
 bool		Transform_null_equals = false;

src/backend/parser/parse_node.c

@@ -20,17 +20,16 @@
 #include "mb/pg_wchar.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "parser/parsetree.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_expr.h"
 #include "parser/parse_relation.h"
+#include "parser/parsetree.h"
 #include "utils/builtins.h"
 #include "utils/int8.h"
 #include "utils/lsyscache.h"
 #include "utils/syscache.h"
 #include "utils/varbit.h"
 
-
 static void pcb_error_callback(void *arg);
 
 

src/backend/parser/parse_relation.c

@@ -26,10 +26,10 @@
 #include "funcapi.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "parser/parsetree.h"
 #include "parser/parse_enr.h"
 #include "parser/parse_relation.h"
 #include "parser/parse_type.h"
+#include "parser/parsetree.h"
 #include "storage/lmgr.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
@@ -37,7 +37,6 @@
 #include "utils/syscache.h"
 #include "utils/varlena.h"
 
-
 #define MAX_FUZZY_DISTANCE				3
 
 static RangeTblEntry *scanNameSpaceForRefname(ParseState *pstate,

src/backend/parser/parse_target.c

@@ -20,19 +20,18 @@
 #include "miscadmin.h"
 #include "nodes/makefuncs.h"
 #include "nodes/nodeFuncs.h"
-#include "parser/parsetree.h"
 #include "parser/parse_coerce.h"
 #include "parser/parse_expr.h"
 #include "parser/parse_func.h"
 #include "parser/parse_relation.h"
 #include "parser/parse_target.h"
 #include "parser/parse_type.h"
+#include "parser/parsetree.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
 #include "utils/rel.h"
 #include "utils/typcache.h"
 
-
 static void markTargetListOrigin(ParseState *pstate, TargetEntry *tle,
 								 Var *var, int levelsup);
 static Node *transformAssignmentIndirection(ParseState *pstate,

src/backend/parser/parse_type.c

@@ -19,14 +19,13 @@
 #include "catalog/pg_type.h"
 #include "lib/stringinfo.h"
 #include "nodes/makefuncs.h"
-#include "parser/parser.h"
 #include "parser/parse_type.h"
+#include "parser/parser.h"
 #include "utils/array.h"
 #include "utils/builtins.h"
 #include "utils/lsyscache.h"
 #include "utils/syscache.h"
 
-
 static int32 typenameTypeMod(ParseState *pstate, const TypeName *typeName,
 							 Type typ);
 

src/backend/parser/scansup.c

@@ -17,9 +17,8 @@
 
 #include <ctype.h>
 
-#include "parser/scansup.h"
 #include "mb/pg_wchar.h"
-
+#include "parser/scansup.h"
 
 /* ----------------
  *		scanstr