Fix problems related to RangeTblEntry members enrname and enrtuples.

Commit 18ce3a4ab2 failed to update
the comments in parsenodes.h for the new members, and made only
incomplete updates to src/backend/nodes

Thomas Munro, per a report from Noah Misch.

Discussion: http://postgr.es/m/20170611062525.GA1628882@rfd.leadboat.com

src/backend/nodes/copyfuncs.c

@@ -2303,10 +2303,11 @@ _copyRangeTblEntry(const RangeTblEntry *from)
 	COPY_STRING_FIELD(ctename);
 	COPY_SCALAR_FIELD(ctelevelsup);
 	COPY_SCALAR_FIELD(self_reference);
-	COPY_STRING_FIELD(enrname);
 	COPY_NODE_FIELD(coltypes);
 	COPY_NODE_FIELD(coltypmods);
 	COPY_NODE_FIELD(colcollations);
+	COPY_STRING_FIELD(enrname);
+	COPY_SCALAR_FIELD(enrtuples);
 	COPY_NODE_FIELD(alias);
 	COPY_NODE_FIELD(eref);
 	COPY_SCALAR_FIELD(lateral);

src/backend/nodes/equalfuncs.c

@@ -2631,6 +2631,8 @@ _equalRangeTblEntry(const RangeTblEntry *a, const RangeTblEntry *b)
 	COMPARE_NODE_FIELD(coltypes);
 	COMPARE_NODE_FIELD(coltypmods);
 	COMPARE_NODE_FIELD(colcollations);
+	COMPARE_STRING_FIELD(enrname);
+	COMPARE_SCALAR_FIELD(enrtuples);
 	COMPARE_NODE_FIELD(alias);
 	COMPARE_NODE_FIELD(eref);
 	COMPARE_SCALAR_FIELD(lateral);

src/backend/nodes/outfuncs.c

@@ -3047,6 +3047,7 @@ _outRangeTblEntry(StringInfo str, const RangeTblEntry *node)
 			break;
 		case RTE_NAMEDTUPLESTORE:
 			WRITE_STRING_FIELD(enrname);
+			WRITE_FLOAT_FIELD(enrtuples, "%.0f");
 			WRITE_OID_FIELD(relid);
 			WRITE_NODE_FIELD(coltypes);
 			WRITE_NODE_FIELD(coltypmods);

src/backend/nodes/readfuncs.c

@@ -1358,6 +1358,7 @@ _readRangeTblEntry(void)
 			break;
 		case RTE_NAMEDTUPLESTORE:
 			READ_STRING_FIELD(enrname);
+			READ_FLOAT_FIELD(enrtuples);
 			READ_OID_FIELD(relid);
 			READ_NODE_FIELD(coltypes);
 			READ_NODE_FIELD(coltypmods);