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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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6
src/select.c
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@@ -12,7 +12,7 @@
** This file contains C code routines that are called by the parser
** to handle SELECT statements in SQLite.
**
** $Id: select.c,v 1.330 2007/03/02 07:27:00 danielk1977 Exp $
** $Id: select.c,v 1.331 2007/03/29 05:51:49 drh Exp $
*/
#include "sqliteInt.h"
@@ -535,7 +535,7 @@ static int selectInnerLoop(
}else{
sqlite3VdbeAddOp(v, OP_NewRowid, iParm, 0);
sqlite3VdbeAddOp(v, OP_Pull, 1, 0);
sqlite3VdbeAddOp(v, OP_Insert, iParm, 0);
sqlite3VdbeAddOp(v, OP_Insert, iParm, OPFLAG_APPEND);
}
break;
}
@@ -714,7 +714,7 @@ static void generateSortTail(
case SRT_EphemTab: {
sqlite3VdbeAddOp(v, OP_NewRowid, iParm, 0);
sqlite3VdbeAddOp(v, OP_Pull, 1, 0);
sqlite3VdbeAddOp(v, OP_Insert, iParm, 0);
sqlite3VdbeAddOp(v, OP_Insert, iParm, OPFLAG_APPEND);
break;
}
#ifndef SQLITE_OMIT_SUBQUERY