Improve field order in RangeTblEntry

When perminfoindex was added, it was just added at the end of the
block.  It would make sense to keep it closer to more related fields.
In passing, also add an inline comment, like the other fields have.
(Other field reorderings and documentation improvements in
RangeTblEntry are being discussed, but it's better not to mix them
together.)

Discussion: https://www.postgresql.org/message-id/flat/6c1fbccc-85c8-40d3-b08b-4f47f2093711%40eisentraut.org

src/backend/nodes/outfuncs.c

@@ -505,8 +505,8 @@ _outRangeTblEntry(StringInfo str, const RangeTblEntry *node)
 			WRITE_OID_FIELD(relid);
 			WRITE_CHAR_FIELD(relkind);
 			WRITE_INT_FIELD(rellockmode);
-			WRITE_NODE_FIELD(tablesample);
 			WRITE_UINT_FIELD(perminfoindex);
+			WRITE_NODE_FIELD(tablesample);
 			break;
 		case RTE_SUBQUERY:
 			WRITE_NODE_FIELD(subquery);

src/backend/nodes/readfuncs.c

@@ -359,8 +359,8 @@ _readRangeTblEntry(void)
 			READ_OID_FIELD(relid);
 			READ_CHAR_FIELD(relkind);
 			READ_INT_FIELD(rellockmode);
-			READ_NODE_FIELD(tablesample);
 			READ_UINT_FIELD(perminfoindex);
+			READ_NODE_FIELD(tablesample);
 			break;
 		case RTE_SUBQUERY:
 			READ_NODE_FIELD(subquery);

src/include/catalog/catversion.h

@@ -57,6 +57,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	202403051
+#define CATALOG_VERSION_NO	202403052
 
 #endif

src/include/nodes/parsenodes.h

@@ -1072,8 +1072,8 @@ typedef struct RangeTblEntry
 	Oid			relid;			/* OID of the relation */
 	char		relkind;		/* relation kind (see pg_class.relkind) */
 	int			rellockmode;	/* lock level that query requires on the rel */
+	Index		perminfoindex;	/* index of RTEPermissionInfo entry, or 0 */
 	struct TableSampleClause *tablesample;	/* sampling info, or NULL */
-	Index		perminfoindex;
 
 	/*
 	 * Fields valid for a subquery RTE (else NULL):