Clean up the mess around EXPLAIN and materialized views.

Revert the matview-related changes in explain.c's API, as per recent
complaint from Robert Haas.  The reason for these appears to have been
principally some ill-considered choices around having intorel_startup do
what ought to be parse-time checking, plus a poor arrangement for passing
it the view parsetree it needs to store into pg_rewrite when creating a
materialized view.  Do the latter by having parse analysis stick a copy
into the IntoClause, instead of doing it at runtime.  (On the whole,
I seriously question the choice to represent CREATE MATERIALIZED VIEW as a
variant of SELECT INTO/CREATE TABLE AS, because that means injecting even
more complexity into what was already a horrid legacy kluge.  However,
I didn't go so far as to rethink that choice ... yet.)

I also moved several error checks into matview parse analysis, and
made the check for external Params in a matview more accurate.

In passing, clean things up a bit more around interpretOidsOption(),
and fix things so that we can use that to force no-oids for views,
sequences, etc, thereby eliminating the need to cons up "oids = false"
options when creating them.

catversion bump due to change in IntoClause.  (I wonder though if we
really need readfuncs/outfuncs support for IntoClause anymore.)

src/backend/nodes/copyfuncs.c

@@ -1032,8 +1032,8 @@ _copyIntoClause(const IntoClause *from)
 	COPY_NODE_FIELD(options);
 	COPY_SCALAR_FIELD(onCommit);
 	COPY_STRING_FIELD(tableSpaceName);
+	COPY_NODE_FIELD(viewQuery);
 	COPY_SCALAR_FIELD(skipData);
-	COPY_SCALAR_FIELD(relkind);
 
 	return newnode;
 }

src/backend/nodes/equalfuncs.c

@@ -123,8 +123,8 @@ _equalIntoClause(const IntoClause *a, const IntoClause *b)
 	COMPARE_NODE_FIELD(options);
 	COMPARE_SCALAR_FIELD(onCommit);
 	COMPARE_STRING_FIELD(tableSpaceName);
+	COMPARE_NODE_FIELD(viewQuery);
 	COMPARE_SCALAR_FIELD(skipData);
-	COMPARE_SCALAR_FIELD(relkind);
 
 	return true;
 }

src/backend/nodes/nodeFuncs.c

@@ -2829,6 +2829,9 @@ raw_expression_tree_walker(Node *node,
 				if (walker(into->rel, context))
 					return true;
 				/* colNames, options are deemed uninteresting */
+				/* viewQuery should be null in raw parsetree, but check it */
+				if (walker(into->viewQuery, context))
+					return true;
 			}
 			break;
 		case T_List:

src/backend/nodes/outfuncs.c

@@ -893,8 +893,8 @@ _outIntoClause(StringInfo str, const IntoClause *node)
 	WRITE_NODE_FIELD(options);
 	WRITE_ENUM_FIELD(onCommit, OnCommitAction);
 	WRITE_STRING_FIELD(tableSpaceName);
+	WRITE_NODE_FIELD(viewQuery);
 	WRITE_BOOL_FIELD(skipData);
-	WRITE_CHAR_FIELD(relkind);
 }
 
 static void

src/backend/nodes/readfuncs.c

@@ -394,8 +394,8 @@ _readIntoClause(void)
 	READ_NODE_FIELD(options);
 	READ_ENUM_FIELD(onCommit, OnCommitAction);
 	READ_STRING_FIELD(tableSpaceName);
+	READ_NODE_FIELD(viewQuery);
 	READ_BOOL_FIELD(skipData);
-	READ_CHAR_FIELD(relkind);
 
 	READ_DONE();
 }