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Slightly faster INSERTs from a SELECT by avoiding an intermediate table.

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But it didn't make nearly as much difference as I had hoped. (CVS 732)

FossilOrigin-Name: 723362e74f79c784314d042e3a8c8a9bf07cbd5e
This commit is contained in:
drh
2002-08-28 03:00:58 +00:00
parent 66105a8ea0
commit 142e30df99
8 changed files with 184 additions and 46 deletions
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15
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 1.110 2002/08/25 19:20:40 drh Exp $
** $Id: select.c,v 1.111 2002/08/28 03:00:59 drh Exp $
*/
#include "sqliteInt.h"
@@ -520,6 +520,14 @@ static int selectInnerLoop(
break;
}
/* Invoke a subroutine to handle the results. The subroutine itself
** is responsible for popping the results off of the stack.
*/
case SRT_Subroutine: {
sqliteVdbeAddOp(v, OP_Gosub, 0, iParm);
break;
}
/* Discard the results. This is used for SELECT statements inside
** the body of a TRIGGER. The purpose of such selects is to call
** user-defined functions that have side effects. We do not care
@@ -1075,7 +1083,6 @@ static int multiSelect(Parse *pParse, Select *p, int eDest, int iParm){
int rc; /* Success code from a subroutine */
Select *pPrior; /* Another SELECT immediately to our left */
Vdbe *v; /* Generate code to this VDBE */
int base; /* Baseline value for pParse->nTab */
/* Make sure there is no ORDER BY clause on prior SELECTs. Only the
** last SELECT in the series may have an ORDER BY.
@@ -1103,7 +1110,6 @@ static int multiSelect(Parse *pParse, Select *p, int eDest, int iParm){
/* Generate code for the left and right SELECT statements.
*/
base = pParse->nTab;
switch( p->op ){
case TK_ALL: {
if( p->pOrderBy==0 ){
@@ -1258,7 +1264,6 @@ static int multiSelect(Parse *pParse, Select *p, int eDest, int iParm){
pParse->nErr++;
return 1;
}
pParse->nTab = base;
return 0;
}
@@ -2080,7 +2085,7 @@ int sqliteSelect(
** successful coding of the SELECT.
*/
select_end:
pParse->nTab = base;
/* pParse->nTab = base; */
sqliteAggregateInfoReset(pParse);
return rc;
}