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Change the SRT_Subroutine mode into SRT_Coroutine. Use co-routines in

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the INSERT processing logic. (CVS 5255)

FossilOrigin-Name: 6b9d92fc3f265ef75c9182e537812490bb818950
This commit is contained in:
drh
2008-06-20 15:24:01 +00:00
parent 2d1d86fbbe
commit e00ee6eb37
6 changed files with 179 additions and 101 deletions
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27
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 1.430 2008/06/06 15:04:37 drh Exp $
** $Id: select.c,v 1.431 2008/06/20 15:24:02 drh Exp $
*/
#include "sqliteInt.h"
@@ -39,7 +39,7 @@ static void clearSelect(Select *p){
void sqlite3SelectDestInit(SelectDest *pDest, int eDest, int iParm){
pDest->eDest = eDest;
pDest->iParm = iParm;
pDest->regReturn = 0;
pDest->regCoroutine = 0;
pDest->affinity = 0;
pDest->iMem = 0;
pDest->nMem = 0;
@@ -704,15 +704,15 @@ static void selectInnerLoop(
** case of a subroutine, the subroutine itself is responsible for
** popping the data from the stack.
*/
case SRT_Subroutine:
case SRT_Coroutine:
case SRT_Callback: {
if( pOrderBy ){
int r1 = sqlite3GetTempReg(pParse);
sqlite3VdbeAddOp3(v, OP_MakeRecord, regResult, nColumn, r1);
pushOntoSorter(pParse, pOrderBy, p, r1);
sqlite3ReleaseTempReg(pParse, r1);
}else if( eDest==SRT_Subroutine ){
sqlite3VdbeAddOp2(v, OP_Gosub, pDest->regReturn, iParm);
}else if( eDest==SRT_Coroutine ){
sqlite3VdbeAddOp1(v, OP_Yield, pDest->regCoroutine);
}else{
sqlite3VdbeAddOp2(v, OP_ResultRow, regResult, nColumn);
sqlite3ExprCacheAffinityChange(pParse, regResult, nColumn);
@@ -810,7 +810,7 @@ static void generateSortTail(
int regRowid;
iTab = pOrderBy->iECursor;
if( eDest==SRT_Callback || eDest==SRT_Subroutine ){
if( eDest==SRT_Callback || eDest==SRT_Coroutine ){
pseudoTab = pParse->nTab++;
sqlite3VdbeAddOp2(v, OP_SetNumColumns, 0, nColumn);
sqlite3VdbeAddOp2(v, OP_OpenPseudo, pseudoTab, eDest==SRT_Callback);
@@ -847,7 +847,7 @@ static void generateSortTail(
}
#endif
case SRT_Callback:
case SRT_Subroutine: {
case SRT_Coroutine: {
int i;
sqlite3VdbeAddOp2(v, OP_Integer, 1, regRowid);
sqlite3VdbeAddOp3(v, OP_Insert, pseudoTab, regRow, regRowid);
@@ -858,8 +858,8 @@ static void generateSortTail(
if( eDest==SRT_Callback ){
sqlite3VdbeAddOp2(v, OP_ResultRow, pDest->iMem, nColumn);
sqlite3ExprCacheAffinityChange(pParse, pDest->iMem, nColumn);
}else{
sqlite3VdbeAddOp2(v, OP_Gosub, pDest->regReturn, iParm);
}else if( eDest==SRT_Coroutine ){
sqlite3VdbeAddOp1(v, OP_Yield, pDest->regCoroutine);
}
break;
}
@@ -883,7 +883,7 @@ static void generateSortTail(
sqlite3VdbeResolveLabel(v, cont);
sqlite3VdbeAddOp2(v, OP_Next, iTab, addr);
sqlite3VdbeResolveLabel(v, brk);
if( eDest==SRT_Callback || eDest==SRT_Subroutine ){
if( eDest==SRT_Callback || eDest==SRT_Coroutine ){
sqlite3VdbeAddOp2(v, OP_Close, pseudoTab, 0);
}
@@ -2992,9 +2992,8 @@ void sqlite3SelectMask(Parse *pParse, Select *p, u32 mask){
** the result there. The cursor is left open after
** returning.
**
** SRT_Subroutine For each row returned, push the results onto the
** vdbe stack and call the subroutine (via OP_Gosub)
** at address pDest->iParm.
** SRT_Coroutine Invoke a co-routine to compute a single row of
** the result
**
** SRT_Exists Store a 1 in memory cell pDest->iParm if the result
** set is not empty.
@@ -3486,7 +3485,7 @@ int sqlite3Select(
}
/* Generate code that runs whenever the GROUP BY changes.
** Change in the GROUP BY are detected by the previous code
** Changes in the GROUP BY are detected by the previous code
** block. If there were no changes, this block is skipped.
**
** This code copies current group by terms in b0,b1,b2,...