Completely remove the iScanRatio field. The PRAGMA index_list(TABLE) command

shows the estimated row size in the forth column.  It also generates a row
for the table with an index name of NULL.  The query planner still does not
take row size estimates into account - that is the next step.

FossilOrigin-Name: 8b4aa0c7a2122bbe60432edadf27e490e31ec987

src/select.c

@@ -4608,9 +4608,9 @@ int sqlite3Select(
         */
         for(pIdx=pTab->pIndex; pIdx; pIdx=pIdx->pNext){
           if( pIdx->bUnordered==0
-           && pIdx->iScanRatio<128
+           && pIdx->szIdxRow<pTab->szTabRow
            && pIdx->pPartIdxWhere==0
-           && (!pBest || pIdx->iScanRatio<pBest->iScanRatio)
+           && (!pBest || pIdx->szIdxRow<pBest->szIdxRow)
           ){
             pBest = pIdx;
           }