15352 typedef struct FKey FKey;  typedef
18548 struct FKey {  struct
18550   FKey *pNextFrom;  /* Next FKey with the same in pFrom. Next parent of pFrom */  argument
18552   FKey *pNextTo;    /* Next with the same zTo. Next child of zTo. */  argument
18553   FKey *pPrevTo;    /* Previous with the same zTo */  argument
18554   int nCol;         /* Number of columns in this key */
18556   u8 isDeferred;       /* True if constraint checking is deferred till COMMIT */
18557   u8 aAction[2];        /* ON DELETE and ON UPDATE actions, respectively */
18558   Trigger *apTrigger[2];/* Triggers for aAction[] actions */
18559   struct sColMap {      /* Mapping of columns in pFrom to columns in zTo */
18562   } aCol[1];            /* One entry for each of nCol columns */