23236 typedef struct VdbeCursor VdbeCursor;  typedef
23237 struct VdbeCursor {  struct
23238   u8 eCurType;            /* One of the CURTYPE_* values above */
23239   i8 iDb;                 /* Index of cursor database in db->aDb[] */
23240   u8 nullRow;             /* True if pointing to a row with no data */
23241   u8 deferredMoveto;      /* A call to sqlite3BtreeMoveto() is needed */
23242   u8 isTable;             /* True for rowid tables.  False for indexes */
23244   u8 seekOp;              /* Most recent seek operation on this cursor */
23245   u8 wrFlag;              /* The wrFlag argument to sqlite3BtreeCursor() */
23270   /* When a new VdbeCursor is allocated, only the fields above are zeroed.  argument
23273   VdbeCursor *pAltCursor; /* Associated index cursor from which to read */  argument
23274   union {
23278   } uc;
23279   KeyInfo *pKeyInfo;      /* Info about index keys needed by index cursors */
23280   u32 iHdrOffset;         /* Offset to next unparsed byte of the header */
23281   Pgno pgnoRoot;          /* Root page of the open btree cursor */
23282   i16 nField;             /* Number of fields in the header */
23306 ** A value for VdbeCursor.cacheStatus that means the cache is always invalid.  argument