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/include/catalog/catversion.h

@@ -53,6 +53,6 @@
  */
 
 /*							yyyymmddN */
-#define CATALOG_VERSION_NO	201304071
+#define CATALOG_VERSION_NO	201304121
 
 #endif

src/include/commands/createas.h

@@ -19,10 +19,6 @@
 #include "tcop/dest.h"
 
 
-extern Query *SetupForCreateTableAs(Query *query, IntoClause *into,
-									 const char *queryString,
-									 ParamListInfo params, DestReceiver *dest);
-
 extern void ExecCreateTableAs(CreateTableAsStmt *stmt, const char *queryString,
 				  ParamListInfo params, char *completionTag);
 

src/include/commands/explain.h

@@ -47,7 +47,6 @@ typedef void (*ExplainOneQuery_hook_type) (Query *query,
 													   IntoClause *into,
 													   ExplainState *es,
 													 const char *queryString,
-													   DestReceiver *dest,
 													   ParamListInfo params);
 extern PGDLLIMPORT ExplainOneQuery_hook_type ExplainOneQuery_hook;
 
@@ -68,8 +67,8 @@ extern void ExplainOneUtility(Node *utilityStmt, IntoClause *into,
 				  const char *queryString, ParamListInfo params);
 
 extern void ExplainOnePlan(PlannedStmt *plannedstmt, IntoClause *into,
-			   ExplainState *es, const char *queryString,
-			   DestReceiver *dest, ParamListInfo params);
+			   ExplainState *es,
+			   const char *queryString, ParamListInfo params);
 
 extern void ExplainPrintPlan(ExplainState *es, QueryDesc *queryDesc);
 

src/include/commands/tablecmds.h

@@ -78,6 +78,4 @@ extern void AtEOSubXact_on_commit_actions(bool isCommit,
 extern void RangeVarCallbackOwnsTable(const RangeVar *relation,
 						  Oid relId, Oid oldRelId, void *arg);
 
-extern bool isQueryUsingTempRelation(Query *query);
-
 #endif   /* TABLECMDS_H */

src/include/nodes/primnodes.h

@@ -82,6 +82,10 @@ typedef struct RangeVar
 /*
  * IntoClause - target information for SELECT INTO, CREATE TABLE AS, and
  * CREATE MATERIALIZED VIEW
+ *
+ * For CREATE MATERIALIZED VIEW, viewQuery is the parsed-but-not-rewritten
+ * SELECT Query for the view; otherwise it's NULL.  (Although it's actually
+ * Query*, we declare it as Node* to avoid a forward reference.)
  */
 typedef struct IntoClause
 {
@@ -92,8 +96,8 @@ typedef struct IntoClause
 	List	   *options;		/* options from WITH clause */
 	OnCommitAction onCommit;	/* what do we do at COMMIT? */
 	char	   *tableSpaceName; /* table space to use, or NULL */
+	Node	   *viewQuery;		/* materialized view's SELECT query */
 	bool		skipData;		/* true for WITH NO DATA */
-	char		relkind;		/* RELKIND_RELATION or RELKIND_MATVIEW */
 } IntoClause;
 
 

src/include/parser/parse_clause.h

@@ -20,7 +20,7 @@ extern void transformFromClause(ParseState *pstate, List *frmList);
 extern int setTargetTable(ParseState *pstate, RangeVar *relation,
 			   bool inh, bool alsoSource, AclMode requiredPerms);
 extern bool interpretInhOption(InhOption inhOpt);
-extern bool interpretOidsOption(List *defList, char relkind);
+extern bool interpretOidsOption(List *defList, bool allowOids);
 
 extern Node *transformWhereClause(ParseState *pstate, Node *clause,
 					 ParseExprKind exprKind, const char *constructName);

src/include/parser/parse_param.h

@@ -20,5 +20,6 @@ extern void parse_fixed_parameters(ParseState *pstate,
 extern void parse_variable_parameters(ParseState *pstate,
 						  Oid **paramTypes, int *numParams);
 extern void check_variable_parameters(ParseState *pstate, Query *query);
+extern bool query_contains_extern_params(Query *query);
 
 #endif   /* PARSE_PARAM_H */

src/include/parser/parse_relation.h

@@ -96,5 +96,6 @@ extern int	attnameAttNum(Relation rd, const char *attname, bool sysColOK);
 extern Name attnumAttName(Relation rd, int attid);
 extern Oid	attnumTypeId(Relation rd, int attid);
 extern Oid	attnumCollationId(Relation rd, int attid);
+extern bool isQueryUsingTempRelation(Query *query);
 
 #endif   /* PARSE_RELATION_H */