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Attempt to optimize virtual table queries with 'OR' expressions in the WHERE clause. (CVS 6527)

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FossilOrigin-Name: f61e4cd93682fd98bea2a71d346f9eaa68454390
This commit is contained in:
danielk1977
2009-04-21 09:02:45 +00:00
parent 8a93919082
commit 1d46146b58
20 changed files with 23972 additions and 24990 deletions
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8
src/test8.c
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@@ -13,7 +13,7 @@
** is not included in the SQLite library. It is used for automated
** testing of the SQLite library.
**
** $Id: test8.c,v 1.76 2009/04/08 15:45:32 drh Exp $
** $Id: test8.c,v 1.77 2009/04/21 09:02:47 danielk1977 Exp $
*/
#include "sqliteInt.h"
#include "tcl.h"
@@ -893,16 +893,16 @@ static int echoBestIndex(sqlite3_vtab *tab, sqlite3_index_info *pIdxInfo){
pIdxInfo->idxNum = hashString(zQuery);
pIdxInfo->idxStr = zQuery;
pIdxInfo->needToFreeIdxStr = 1;
if (useCost) {
if( useCost ){
pIdxInfo->estimatedCost = cost;
} else if( useIdx ){
}else if( useIdx ){
/* Approximation of log2(nRow). */
for( ii=0; ii<(sizeof(int)*8); ii++ ){
if( nRow & (1<<ii) ){
pIdxInfo->estimatedCost = (double)ii;
}
}
} else {
}else{
pIdxInfo->estimatedCost = (double)nRow;
}
return rc;