rHasNullFlag     84638 ext/sqlite3/libsqlite/sqlite3.c   int rHasNullFlag,       /* Register that records whether NULLs exist in RHS */
rHasNullFlag     84833 ext/sqlite3/libsqlite/sqlite3.c   if( rHasNullFlag ){
rHasNullFlag     84834 ext/sqlite3/libsqlite/sqlite3.c     sqlite3SetHasNullFlag(v, pExpr->iTable, rHasNullFlag);