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Scan an index instead of a table for "SELECT count(*) FROM <tbl>" queries. Because an index is usually smaller than a table on disk, this saves some IO. (CVS 6315)

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FossilOrigin-Name: 294ba6f743c9132dce0e73da480bd3c2071e7239
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danielk1977
2009-02-23 17:33:49 +00:00
parent 699b3d4f89
commit e2d7b24d08
9 changed files with 82 additions and 33 deletions
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3
src/update.c
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@@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle UPDATE statements.
**
** $Id: update.c,v 1.193 2009/02/20 10:58:42 danielk1977 Exp $
** $Id: update.c,v 1.194 2009/02/23 17:33:50 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -343,6 +343,7 @@ void sqlite3Update(
/* Begin the database scan
*/
sqlite3VdbeAddOp2(v, OP_Null, 0, regOldRowid);
pTabList->a[0].usesRowid = 1;
pWInfo = sqlite3WhereBegin(pParse, pTabList, pWhere, 0,
WHERE_ONEPASS_DESIRED, 0);
if( pWInfo==0 ) goto update_cleanup;