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Code cleanup and simplification. Three new Mem opcodes added.

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The sqlite3VdbeJumpHere function added. (CVS 2730)

FossilOrigin-Name: 2471957feee57538e5e1e50a704a337f0927d10e
This commit is contained in:
drh
2005-09-20 17:42:23 +00:00
parent 4f68623875
commit d654be803f
15 changed files with 123 additions and 107 deletions
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12
src/where.c
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@@ -16,7 +16,7 @@
** so is applicable. Because this module is responsible for selecting
** indices, you might also think of this module as the "query optimizer".
**
** $Id: where.c,v 1.178 2005/09/20 08:47:20 drh Exp $
** $Id: where.c,v 1.179 2005/09/20 17:42:23 drh Exp $
*/
#include "sqliteInt.h"
@@ -1597,8 +1597,7 @@ WhereInfo *sqlite3WhereBegin(
if( pLevel->iFrom>0 && (pTabItem[-1].jointype & JT_LEFT)!=0 ){
if( !pParse->nMem ) pParse->nMem++;
pLevel->iLeftJoin = pParse->nMem++;
sqlite3VdbeAddOp(v, OP_Null, 0, 0);
sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);
sqlite3VdbeAddOp(v, OP_MemInt, 0, pLevel->iLeftJoin);
VdbeComment((v, "# init LEFT JOIN no-match flag"));
}
@@ -1878,8 +1877,7 @@ WhereInfo *sqlite3WhereBegin(
*/
if( pLevel->iLeftJoin ){
pLevel->top = sqlite3VdbeCurrentAddr(v);
sqlite3VdbeAddOp(v, OP_Integer, 1, 0);
sqlite3VdbeAddOp(v, OP_MemStore, pLevel->iLeftJoin, 1);
sqlite3VdbeAddOp(v, OP_MemInt, 1, pLevel->iLeftJoin);
VdbeComment((v, "# record LEFT JOIN hit"));
for(pTerm=wc.a, j=0; j<wc.nTerm; j++, pTerm++){
if( pTerm->flags & (TERM_VIRTUAL|TERM_CODED) ) continue;
@@ -1981,13 +1979,13 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
}
if( pLevel->iLeftJoin ){
int addr;
addr = sqlite3VdbeAddOp(v, OP_MemLoad, pLevel->iLeftJoin, 0);
sqlite3VdbeAddOp(v, OP_NotNull, 1, addr+4 + (pLevel->iIdxCur>=0));
addr = sqlite3VdbeAddOp(v, OP_IfMemPos, pLevel->iLeftJoin, 0);
sqlite3VdbeAddOp(v, OP_NullRow, pTabList->a[i].iCursor, 0);
if( pLevel->iIdxCur>=0 ){
sqlite3VdbeAddOp(v, OP_NullRow, pLevel->iIdxCur, 0);
}
sqlite3VdbeAddOp(v, OP_Goto, 0, pLevel->top);
sqlite3VdbeJumpHere(v, addr);
}
}