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Change BtreeMoveto so that it can be biased to the right or to the center.

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Use a right bias when appending and a center bias when searching.  This
gives about a 15% reduction in calls to sqlite3VdbeRecordCompare. (CVS 3741)

FossilOrigin-Name: ad4a6b1a91bcefd8a4c75e8dc99c1153c72c31a3
This commit is contained in:
drh
2007-03-29 05:51:49 +00:00
parent f1d68b3096
commit e4d9081307
13 changed files with 101 additions and 67 deletions
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4
src/build.c
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@@ -22,7 +22,7 @@
** COMMIT
** ROLLBACK
**
** $Id: build.c,v 1.417 2007/03/27 13:36:37 drh Exp $
** $Id: build.c,v 1.418 2007/03/29 05:51:49 drh Exp $
*/
#include "sqliteInt.h"
#include <ctype.h>
@@ -887,7 +887,7 @@ void sqlite3StartTable(
sqlite3VdbeAddOp(v, OP_NewRowid, 0, 0);
sqlite3VdbeAddOp(v, OP_Dup, 0, 0);
sqlite3VdbeAddOp(v, OP_Null, 0, 0);
sqlite3VdbeAddOp(v, OP_Insert, 0, 0);
sqlite3VdbeAddOp(v, OP_Insert, 0, OPFLAG_APPEND);
sqlite3VdbeAddOp(v, OP_Close, 0, 0);
sqlite3VdbeAddOp(v, OP_Pull, 1, 0);
}