23013 typedef struct VdbeCursor VdbeCursor;  typedef
23014 struct VdbeCursor {  struct
23015   u8 eCurType;            /* One of the CURTYPE_* values above */
23016   i8 iDb;                 /* Index of cursor database in db->aDb[] */
23017   u8 nullRow;             /* True if pointing to a row with no data */
23018   u8 deferredMoveto;      /* A call to sqlite3BtreeMoveto() is needed */
23019   u8 isTable;             /* True for rowid tables.  False for indexes */
23021   u8 seekOp;              /* Most recent seek operation on this cursor */
23022   u8 wrFlag;              /* The wrFlag argument to sqlite3BtreeCursor() */
23047   /* When a new VdbeCursor is allocated, only the fields above are zeroed.  argument
23050   VdbeCursor *pAltCursor; /* Associated index cursor from which to read */  argument
23051   union {
23055   } uc;
23056   KeyInfo *pKeyInfo;      /* Info about index keys needed by index cursors */
23057   u32 iHdrOffset;         /* Offset to next unparsed byte of the header */
23058   Pgno pgnoRoot;          /* Root page of the open btree cursor */
23059   i16 nField;             /* Number of fields in the header */
23083 ** A value for VdbeCursor.cacheStatus that means the cache is always invalid.  argument