Sometimes it makes sense to do a full table scan rather than try to use

an index when most of the rows will be selected.  This branch is trying to
tune the query planner to make that happen more often.

FossilOrigin-Name: 0f42099ad65855c94af8472f3a6fddac7fc2a82e8fdfcc06a298eb6683a28688

src/sqliteInt.h

@@ -2187,6 +2187,7 @@ struct Table {
 #define TF_OOOHidden       0x0400    /* Out-of-Order hidden columns */
 #define TF_HasNotNull      0x0800    /* Contains NOT NULL constraints */
 #define TF_Shadow          0x1000    /* True for a shadow table */
+#define TF_HasStat4        0x2000    /* STAT4 info available for this table */
 
 /*
 ** Test to see whether or not a table is a virtual table.  This is