Merge recent trunk micro-optimizations and the DESC index GROUP BY ORDER BY

bug fix into the sessions branch.

FossilOrigin-Name: 83d4114f2aa404e670ced33511183baacd813a01

src/vdbeInt.h

@@ -73,7 +73,6 @@ struct VdbeCursor {
 #endif
   i8 iDb;               /* Index of cursor database in db->aDb[] (or -1) */
   u8 nullRow;           /* True if pointing to a row with no data */
-  u8 rowidIsValid;      /* True if lastRowid is valid */
   u8 deferredMoveto;    /* A call to sqlite3BtreeMoveto() is needed */
   Bool isEphemeral:1;   /* True for an ephemeral table */
   Bool useRandomRowid:1;/* Generate new record numbers semi-randomly */
@@ -83,7 +82,6 @@ struct VdbeCursor {
   sqlite3_vtab_cursor *pVtabCursor;  /* The cursor for a virtual table */
   i64 seqCount;         /* Sequence counter */
   i64 movetoTarget;     /* Argument to the deferred sqlite3BtreeMoveto() */
-  i64 lastRowid;        /* Rowid being deleted by OP_Delete */
   VdbeSorter *pSorter;  /* Sorter object for OP_SorterOpen cursors */
 
   /* Cached information about the header for the data record that the
@@ -100,6 +98,7 @@ struct VdbeCursor {
   u32 szRow;            /* Byte available in aRow */
   u32 iHdrOffset;       /* Offset to next unparsed byte of the header */
   const u8 *aRow;       /* Data for the current row, if all on one page */
+  u32 *aOffset;         /* Pointer to aType[nField] */
   u32 aType[1];         /* Type values for all entries in the record */
   /* 2*nField extra array elements allocated for aType[], beyond the one
   ** static element declared in the structure.  nField total array slots for
@@ -176,7 +175,7 @@ struct Mem {
   /* ShallowCopy only needs to copy the information above */
   char *zMalloc;      /* Space to hold MEM_Str or MEM_Blob if szMalloc>0 */
   int szMalloc;       /* Size of the zMalloc allocation */
-  int iPadding1;      /* Padding for 8-byte alignment */
+  u32 uTemp;          /* Transient storage for serial_type in OP_MakeRecord */
   sqlite3 *db;        /* The associated database connection */
   void (*xDel)(void*);/* Destructor for Mem.z - only valid if MEM_Dyn */
 #ifdef SQLITE_DEBUG
@@ -403,6 +402,7 @@ struct PreUpdate {
 void sqlite3VdbeFreeCursor(Vdbe *, VdbeCursor*);
 void sqliteVdbePopStack(Vdbe*,int);
 int sqlite3VdbeCursorMoveto(VdbeCursor*);
+int sqlite3VdbeCursorRestore(VdbeCursor*);
 #if defined(SQLITE_DEBUG) || defined(VDBE_PROFILE)
 void sqlite3VdbePrintOp(FILE*, int, Op*);
 #endif