Enhance the query planner to exploit transitivity of join constraints in

a multi-way join.

FossilOrigin-Name: 13171eb5dc19733276fbfd5515d75b70a9f5f5d7

src/sqliteInt.h

@@ -575,6 +575,11 @@ struct BusyHandler {
 */
 #define ArraySize(X)    ((int)(sizeof(X)/sizeof(X[0])))
 
+/*
+** Determine if the argument is a power of two
+*/
+#define IsPowerOfTwo(X) (((X)&((X)-1))==0)
+
 /*
 ** The following value as a destructor means to use sqlite3DbFree().
 ** The sqlite3DbFree() routine requires two parameters instead of the