Add the AS MATERIALIZED and AS NOT MATERIALIZED syntax that works like it

does in PostgreSQL.

FossilOrigin-Name: a6bb272ec0c758ab069bfc07443624e0ea7910b1f23224ee078d050fa3ccf068

src/sqliteInt.h

@@ -3895,8 +3895,16 @@ struct Cte {
   Select *pSelect;        /* The definition of this CTE */
   const char *zCteErr;    /* Error message for circular references */
   CteUse *pUse;           /* Usage information for this CTE */
+  u8 eM10d;               /* The MATERIALIZED flag */
 };
 
+/*
+** Allowed values for the materialized flag (eM10d):
+*/
+#define M10d_Yes       0  /* AS MATERIALIZED */
+#define M10d_Any       1  /* Not specified.  Query planner's choice */
+#define M10d_No        2  /* AS NOT MATERIALIZED */
+
 /*
 ** An instance of the With object represents a WITH clause containing
 ** one or more CTEs (common table expressions).
@@ -3924,6 +3932,7 @@ struct CteUse {
   int regRtn;            /* Return address register for addrM9e subroutine */
   int iCur;              /* Ephemeral table holding the materialization */
   LogEst nRowEst;        /* Estimated number of rows in the table */
+  u8 eM10d;              /* The MATERIALIZED flag */
 };
 
 
@@ -4930,7 +4939,7 @@ const char *sqlite3JournalModename(int);
   int sqlite3WalDefaultHook(void*,sqlite3*,const char*,int);
 #endif
 #ifndef SQLITE_OMIT_CTE
-  Cte *sqlite3CteNew(Parse*,Token*,ExprList*,Select*);
+  Cte *sqlite3CteNew(Parse*,Token*,ExprList*,Select*,u8);
   void sqlite3CteDelete(sqlite3*,Cte*);
   With *sqlite3WithAdd(Parse*,With*,Cte*);
   void sqlite3WithDelete(sqlite3*,With*);