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Changes to reduce the heap space consumed by triggers, views and tables in the in-memory representation of the schema. Also to reduce the space used by prepared statements slightly. (CVS 6305)

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FossilOrigin-Name: d9f6ffbc5ea090ba0daac571fc9a6c68b9c864e4
This commit is contained in:
danielk1977
2009-02-19 14:39:25 +00:00
parent 076d4661a6
commit 6ab3a2ec8a
27 changed files with 664 additions and 366 deletions
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62
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 1.499 2009/02/09 13:19:28 drh Exp $
** $Id: select.c,v 1.500 2009/02/19 14:39:25 danielk1977 Exp $
*/
#include "sqliteInt.h"
@@ -987,8 +987,9 @@ static const char *columnType(
** statement.
*/
NameContext sNC;
Select *pS = pExpr->pSelect;
Select *pS = pExpr->x.pSelect;
Expr *p = pS->pEList->a[0].pExpr;
assert( ExprHasProperty(pExpr, EP_xIsSelect) );
sNC.pSrcList = pS->pSrc;
sNC.pNext = pNC;
sNC.pParse = pNC->pParse;
@@ -2141,7 +2142,7 @@ static int multiSelectOrderBy(
/* Reattach the ORDER BY clause to the query.
*/
p->pOrderBy = pOrderBy;
pPrior->pOrderBy = sqlite3ExprListDup(pParse->db, pOrderBy);
pPrior->pOrderBy = sqlite3ExprListDup(pParse->db, pOrderBy, 0);
/* Allocate a range of temporary registers and the KeyInfo needed
** for the logic that removes duplicate result rows when the
@@ -2392,23 +2393,26 @@ static void substExpr(
}else{
Expr *pNew;
assert( pEList!=0 && pExpr->iColumn<pEList->nExpr );
assert( pExpr->pLeft==0 && pExpr->pRight==0 && pExpr->pList==0 );
assert( pExpr->pLeft==0 && pExpr->pRight==0 );
pNew = pEList->a[pExpr->iColumn].pExpr;
assert( pNew!=0 );
pExpr->op = pNew->op;
assert( pExpr->pLeft==0 );
pExpr->pLeft = sqlite3ExprDup(db, pNew->pLeft);
pExpr->pLeft = sqlite3ExprDup(db, pNew->pLeft, 0);
assert( pExpr->pRight==0 );
pExpr->pRight = sqlite3ExprDup(db, pNew->pRight);
assert( pExpr->pList==0 );
pExpr->pList = sqlite3ExprListDup(db, pNew->pList);
pExpr->pRight = sqlite3ExprDup(db, pNew->pRight, 0);
pExpr->iTable = pNew->iTable;
pExpr->pTab = pNew->pTab;
pExpr->iColumn = pNew->iColumn;
pExpr->iAgg = pNew->iAgg;
sqlite3TokenCopy(db, &pExpr->token, &pNew->token);
sqlite3TokenCopy(db, &pExpr->span, &pNew->span);
pExpr->pSelect = sqlite3SelectDup(db, pNew->pSelect);
assert( pExpr->x.pList==0 && pExpr->x.pSelect==0 );
if( ExprHasProperty(pNew, EP_xIsSelect) ){
pExpr->x.pSelect = sqlite3SelectDup(db, pNew->x.pSelect, 0);
}else{
pExpr->x.pList = sqlite3ExprListDup(db, pNew->x.pList, 0);
}
pExpr->flags = pNew->flags;
pExpr->pAggInfo = pNew->pAggInfo;
pNew->pAggInfo = 0;
@@ -2416,8 +2420,11 @@ static void substExpr(
}else{
substExpr(db, pExpr->pLeft, iTable, pEList);
substExpr(db, pExpr->pRight, iTable, pEList);
substSelect(db, pExpr->pSelect, iTable, pEList);
substExprList(db, pExpr->pList, iTable, pEList);
if( ExprHasProperty(pExpr, EP_xIsSelect) ){
substSelect(db, pExpr->x.pSelect, iTable, pEList);
}else{
substExprList(db, pExpr->x.pList, iTable, pEList);
}
}
}
static void substExprList(
@@ -2729,7 +2736,7 @@ static int flattenSubquery(
p->pSrc = 0;
p->pPrior = 0;
p->pLimit = 0;
pNew = sqlite3SelectDup(db, p);
pNew = sqlite3SelectDup(db, p, 0);
p->pLimit = pLimit;
p->pOrderBy = pOrderBy;
p->pSrc = pSrc;
@@ -2873,7 +2880,7 @@ static int flattenSubquery(
substExprList(db, pParent->pOrderBy, iParent, pSub->pEList);
}
if( pSub->pWhere ){
pWhere = sqlite3ExprDup(db, pSub->pWhere);
pWhere = sqlite3ExprDup(db, pSub->pWhere, 0);
}else{
pWhere = 0;
}
@@ -2883,9 +2890,9 @@ static int flattenSubquery(
pParent->pWhere = pWhere;
substExpr(db, pParent->pHaving, iParent, pSub->pEList);
pParent->pHaving = sqlite3ExprAnd(db, pParent->pHaving,
sqlite3ExprDup(db, pSub->pHaving));
sqlite3ExprDup(db, pSub->pHaving, 0));
assert( pParent->pGroupBy==0 );
pParent->pGroupBy = sqlite3ExprListDup(db, pSub->pGroupBy);
pParent->pGroupBy = sqlite3ExprListDup(db, pSub->pGroupBy, 0);
}else{
substExpr(db, pParent->pWhere, iParent, pSub->pEList);
pParent->pWhere = sqlite3ExprAnd(db, pParent->pWhere, pWhere);
@@ -2934,7 +2941,8 @@ static u8 minMaxQuery(Select *p){
if( pEList->nExpr!=1 ) return WHERE_ORDERBY_NORMAL;
pExpr = pEList->a[0].pExpr;
pEList = pExpr->pList;
if( ExprHasProperty(pExpr, EP_xIsSelect) ) return 0;
pEList = pExpr->x.pList;
if( pExpr->op!=TK_AGG_FUNCTION || pEList==0 || pEList->nExpr!=1 ) return 0;
if( pEList->a[0].pExpr->op!=TK_AGG_COLUMN ) return WHERE_ORDERBY_NORMAL;
if( pExpr->token.n!=3 ) return WHERE_ORDERBY_NORMAL;
@@ -3065,7 +3073,7 @@ static int selectExpander(Walker *pWalker, Select *p){
** in the inner view.
*/
if( pFrom->pSelect==0 ){
pFrom->pSelect = sqlite3SelectDup(db, pTab->pSelect);
pFrom->pSelect = sqlite3SelectDup(db, pTab->pSelect, 0);
sqlite3WalkSelect(pWalker, pFrom->pSelect);
}
}
@@ -3364,12 +3372,13 @@ static void resetAccumulator(Parse *pParse, AggInfo *pAggInfo){
sqlite3VdbeAddOp2(v, OP_Null, 0, pFunc->iMem);
if( pFunc->iDistinct>=0 ){
Expr *pE = pFunc->pExpr;
if( pE->pList==0 || pE->pList->nExpr!=1 ){
assert( !ExprHasProperty(pE, EP_xIsSelect) );
if( pE->x.pList==0 || pE->x.pList->nExpr!=1 ){
sqlite3ErrorMsg(pParse, "DISTINCT aggregates must have exactly one "
"argument");
pFunc->iDistinct = -1;
}else{
KeyInfo *pKeyInfo = keyInfoFromExprList(pParse, pE->pList);
KeyInfo *pKeyInfo = keyInfoFromExprList(pParse, pE->x.pList);
sqlite3VdbeAddOp4(v, OP_OpenEphemeral, pFunc->iDistinct, 0, 0,
(char*)pKeyInfo, P4_KEYINFO_HANDOFF);
}
@@ -3386,7 +3395,8 @@ static void finalizeAggFunctions(Parse *pParse, AggInfo *pAggInfo){
int i;
struct AggInfo_func *pF;
for(i=0, pF=pAggInfo->aFunc; i<pAggInfo->nFunc; i++, pF++){
ExprList *pList = pF->pExpr->pList;
ExprList *pList = pF->pExpr->x.pList;
assert( !ExprHasProperty(pF->pExpr, EP_xIsSelect) );
sqlite3VdbeAddOp4(v, OP_AggFinal, pF->iMem, pList ? pList->nExpr : 0, 0,
(void*)pF->pFunc, P4_FUNCDEF);
}
@@ -3407,7 +3417,8 @@ static void updateAccumulator(Parse *pParse, AggInfo *pAggInfo){
int nArg;
int addrNext = 0;
int regAgg;
ExprList *pList = pF->pExpr->pList;
ExprList *pList = pF->pExpr->x.pList;
assert( !ExprHasProperty(pF->pExpr, EP_xIsSelect) );
if( pList ){
nArg = pList->nExpr;
regAgg = sqlite3GetTempRange(pParse, nArg);
@@ -3657,7 +3668,7 @@ int sqlite3Select(
** GROUP BY might use an index, DISTINCT never does.
*/
if( (p->selFlags & (SF_Distinct|SF_Aggregate))==SF_Distinct && !p->pGroupBy ){
p->pGroupBy = sqlite3ExprListDup(db, p->pEList);
p->pGroupBy = sqlite3ExprListDup(db, p->pEList, 0);
pGroupBy = p->pGroupBy;
p->selFlags &= ~SF_Distinct;
isDistinct = 0;
@@ -3780,7 +3791,8 @@ int sqlite3Select(
}
sAggInfo.nAccumulator = sAggInfo.nColumn;
for(i=0; i<sAggInfo.nFunc; i++){
sqlite3ExprAnalyzeAggList(&sNC, sAggInfo.aFunc[i].pExpr->pList);
assert( !ExprHasProperty(sAggInfo.aFunc[i].pExpr, EP_xIsSelect) );
sqlite3ExprAnalyzeAggList(&sNC, sAggInfo.aFunc[i].pExpr->x.pList);
}
if( db->mallocFailed ) goto select_end;
@@ -4018,7 +4030,9 @@ int sqlite3Select(
*/
flag = minMaxQuery(p);
if( flag ){
pDel = pMinMax = sqlite3ExprListDup(db, p->pEList->a[0].pExpr->pList);
assert( !ExprHasProperty(p->pEList->a[0].pExpr, EP_xIsSelect) );
pMinMax = sqlite3ExprListDup(db, p->pEList->a[0].pExpr->x.pList,0);
pDel = pMinMax;
if( pMinMax && !db->mallocFailed ){
pMinMax->a[0].sortOrder = flag!=WHERE_ORDERBY_MIN ?1:0;
pMinMax->a[0].pExpr->op = TK_COLUMN;