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Overview
| Comment: | Another tweak to improve performance of fts5 prefix queries. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA1: | 69be427c864dc3de804ca3c5f1c6addc |
| User & Date: | dan 2015-10-19 17:43:24 |
Context
|
2015-10-19
| ||
| 20:49 | Another optimization for fts5 prefix (and other) queries. check-in: 60a8bde0 user: dan tags: trunk | |
| 17:43 | Another tweak to improve performance of fts5 prefix queries. check-in: 69be427c user: dan tags: trunk | |
| 15:59 | Fix a problem in the fts5txt2db.tcl script causing it to fail when creating tables with more than 8 columns. check-in: 68ee426a user: dan tags: trunk | |
Changes
Changes to ext/fts5/fts5_index.c.
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assert( fts5MultiIterEof(p, pMulti)==0 );
assert( pSeg->nPos>0 );
if( 0==fts5BufferGrow(&p->rc, pBuf, pSeg->nPos+9+9) ){
int iSv1;
int iSv2;
int iData;
/* Append iDelta */
iSv1 = pBuf->n;
fts5BufferSafeAppendVarint(pBuf, iDelta);
/* WRITEPOSLISTSIZE */
iSv2 = pBuf->n;
fts5BufferSafeAppendVarint(pBuf, pSeg->nPos*2);
iData = pBuf->n;
if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf
&& (pColset==0 || pColset->nCol==1)
){
const u8 *pPos = &pSeg->pLeaf->p[pSeg->iLeafOffset];
int nPos;
if( pColset ){
nPos = fts5IndexExtractCol(&pPos, pSeg->nPos, pColset->aiCol[0]);
}else{
nPos = pSeg->nPos;
}
fts5BufferSafeAppendBlob(pBuf, pPos, nPos);
}else{
fts5SegiterPoslist(p, pSeg, pColset, pBuf);
}
if( pColset ){
int nActual = pBuf->n - iData;
if( nActual!=pSeg->nPos ){
if( nActual==0 ){
pBuf->n = iSv1;
return 1;
}else{
int nReq = sqlite3Fts5GetVarintLen((u32)(nActual*2));
while( iSv2<(iData-nReq) ){ pBuf->p[iSv2++] = 0x80; }
sqlite3Fts5PutVarint(&pBuf->p[iSv2], nActual*2);
}
}
}
}
}
return 0;
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assert( fts5MultiIterEof(p, pMulti)==0 );
assert( pSeg->nPos>0 );
if( 0==fts5BufferGrow(&p->rc, pBuf, pSeg->nPos+9+9) ){
int iSv1;
int iSv2;
int iData;
if( pSeg->iLeafOffset+pSeg->nPos<=pSeg->pLeaf->szLeaf
&& (pColset==0 || pColset->nCol==1)
){
const u8 *pPos = &pSeg->pLeaf->p[pSeg->iLeafOffset];
int nPos;
if( pColset ){
nPos = fts5IndexExtractCol(&pPos, pSeg->nPos, pColset->aiCol[0]);
if( nPos==0 ) return 1;
}else{
nPos = pSeg->nPos;
}
assert( nPos>0 );
fts5BufferSafeAppendVarint(pBuf, iDelta);
fts5BufferSafeAppendVarint(pBuf, nPos*2);
fts5BufferSafeAppendBlob(pBuf, pPos, nPos);
}else{
/* Append iDelta */
iSv1 = pBuf->n;
fts5BufferSafeAppendVarint(pBuf, iDelta);
/* WRITEPOSLISTSIZE */
iSv2 = pBuf->n;
fts5BufferSafeAppendVarint(pBuf, pSeg->nPos*2);
iData = pBuf->n;
fts5SegiterPoslist(p, pSeg, pColset, pBuf);
if( pColset ){
int nActual = pBuf->n - iData;
if( nActual!=pSeg->nPos ){
if( nActual==0 ){
pBuf->n = iSv1;
return 1;
}else{
int nReq = sqlite3Fts5GetVarintLen((u32)(nActual*2));
while( iSv2<(iData-nReq) ){ pBuf->p[iSv2++] = 0x80; }
sqlite3Fts5PutVarint(&pBuf->p[iSv2], nActual*2);
}
}
}
}
}
}
return 0;
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