75 typedef struct VdbeCursor VdbeCursor;  typedef
76 struct VdbeCursor {  struct
77   u8 eCurType;            /* One of the CURTYPE_* values above */
78   i8 iDb;                 /* Index of cursor database in db->aDb[] */
79   u8 nullRow;             /* True if pointing to a row with no data */
80   u8 deferredMoveto;      /* A call to sqlite3BtreeMoveto() is needed */
81   u8 isTable;             /* True for rowid tables.  False for indexes */
83   u8 seekOp;              /* Most recent seek operation on this cursor */
84   u8 wrFlag;              /* The wrFlag argument to sqlite3BtreeCursor() */
108   /* When a new VdbeCursor is allocated, only the fields above are zeroed.  argument
111   VdbeCursor *pAltCursor; /* Associated index cursor from which to read */  argument
112   union {
116   } uc;
117   KeyInfo *pKeyInfo;      /* Info about index keys needed by index cursors */
118   u32 iHdrOffset;         /* Offset to next unparsed byte of the header */
119   Pgno pgnoRoot;          /* Root page of the open btree cursor */
120   i16 nField;             /* Number of fields in the header */
144 ** A value for VdbeCursor.cacheStatus that means the cache is always invalid.  argument