Reduce the amount of heap required to store many schemas by storing each

column datatype appended to the column name, rather than as a separate
allocation.

FossilOrigin-Name: 842b21162713bb141b845b01c136457a31af4ab0

src/sqliteInt.h

@@ -1543,9 +1543,8 @@ struct Module {
 ** of this structure.
 */
 struct Column {
-  char *zName;     /* Name of this column */
+  char *zName;     /* Name of this column, \000, then the type */
   Expr *pDflt;     /* Default value of this column */
-  char *zType;     /* Data type for this column */
   char *zColl;     /* Collating sequence.  If NULL, use the default */
   u8 notNull;      /* An OE_ code for handling a NOT NULL constraint */
   char affinity;   /* One of the SQLITE_AFF_... values */
@@ -3258,6 +3257,7 @@ int sqlite3IsIdChar(u8);
 */
 int sqlite3StrICmp(const char*,const char*);
 int sqlite3Strlen30(const char*);
+const char *sqlite3StrNext(const char*);
 #define sqlite3StrNICmp sqlite3_strnicmp
 
 int sqlite3MallocInit(void);