Enhance the ANALYZE command so that it gathers statistics in the sqlite_stat1

table even for tables that are empty or have no indices.

FossilOrigin-Name: a7645d293801da64a7579737d0a8b48117af2e2c

src/sqliteInt.h

@@ -1252,6 +1252,7 @@ struct Table {
   Column *aCol;        /* Information about each column */
   Index *pIndex;       /* List of SQL indexes on this table. */
   int tnum;            /* Root BTree node for this table (see note above) */
+  unsigned nRowEst;    /* Estimated rows in table - from sqlite_stat1 table */
   Select *pSelect;     /* NULL for tables.  Points to definition if a view. */
   u16 nRef;            /* Number of pointers to this Table */
   u8 tabFlags;         /* Mask of TF_* values */