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Overview
| Comment: | When unpacking a sorter record, do so from right to left instead of left to right, since by starting with the right-most column, the work done by OP_Column opcodes is reduced. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: | 8055e4f42446ceb5bcf752bbf41a7328 |
| User & Date: | drh 2018-01-24 20:42:42 |
Context
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2018-01-25
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| 01:20 | Slightly smaller and faster implementation of OP_If and OP_IfNot. check-in: 6ab42934 user: drh tags: trunk | |
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2018-01-24
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| 20:42 | When unpacking a sorter record, do so from right to left instead of left to right, since by starting with the right-most column, the work done by OP_Column opcodes is reduced. check-in: 8055e4f4 user: drh tags: trunk | |
| 18:28 | Reorganize spellfix.c to make it easier to edit automatically (e.g. using a script). No changes to functionality. check-in: 090a64fa user: dan tags: trunk | |
Changes
Changes to src/select.c.
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bSeq = 0;
}else{
addr = 1 + sqlite3VdbeAddOp2(v, OP_Sort, iTab, addrBreak); VdbeCoverage(v);
codeOffset(v, p->iOffset, addrContinue);
iSortTab = iTab;
bSeq = 1;
}
for(i=0, iCol=nKey+bSeq; i<nSortData; i++){
int iRead;
if( aOutEx[i].u.x.iOrderByCol ){
iRead = aOutEx[i].u.x.iOrderByCol-1;
}else{
iRead = iCol++;
}
sqlite3VdbeAddOp3(v, OP_Column, iSortTab, iRead, regRow+i);
VdbeComment((v, "%s", aOutEx[i].zName ? aOutEx[i].zName : aOutEx[i].zSpan));
}
switch( eDest ){
case SRT_Table:
case SRT_EphemTab: {
|
| > > > | |
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bSeq = 0;
}else{
addr = 1 + sqlite3VdbeAddOp2(v, OP_Sort, iTab, addrBreak); VdbeCoverage(v);
codeOffset(v, p->iOffset, addrContinue);
iSortTab = iTab;
bSeq = 1;
}
for(i=0, iCol=nKey+bSeq-1; i<nSortData; i++){
if( aOutEx[i].u.x.iOrderByCol==0 ) iCol++;
}
for(i=nSortData-1; i>=0; i--){
int iRead;
if( aOutEx[i].u.x.iOrderByCol ){
iRead = aOutEx[i].u.x.iOrderByCol-1;
}else{
iRead = iCol--;
}
sqlite3VdbeAddOp3(v, OP_Column, iSortTab, iRead, regRow+i);
VdbeComment((v, "%s", aOutEx[i].zName ? aOutEx[i].zName : aOutEx[i].zSpan));
}
switch( eDest ){
case SRT_Table:
case SRT_EphemTab: {
|