163316 typedef struct WhereLoop WhereLoop;  typedef
163417 struct WhereLoop {  struct
163418   Bitmask prereq;       /* Bitmask of other loops that must run first */
163419   Bitmask maskSelf;     /* Bitmask identifying table iTab */
163421   char cId;             /* Symbolic ID of this loop for debugging use */
163423   u8 iTab;              /* Position in FROM clause of table for this loop */
163424   u8 iSortIdx;          /* Sorting index number.  0==None */
163425   LogEst rSetup;        /* One-time setup cost (ex: create transient index) */
163426   LogEst rRun;          /* Cost of running each loop */
163427   LogEst nOut;          /* Estimated number of output rows */
163428   union {
163452 # define WHERE_LOOP_XFER_SZ offsetof(WhereLoop,nLSlot)  argument
163459   WhereLoop *pNextLoop; /* Next WhereLoop object in the WhereClause */  argument
163460   WhereTerm *aLTermSpace[3];  /* Initial aLTerm[] space */