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Improve the performance of fts3/4 queries that use the OR operator and at least one auxiliary fts function.

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FossilOrigin-Name: 245e8730451fbdc1c729beff7295c452df604009
This commit is contained in:
dan
2015-01-27 18:43:02 +00:00
parent a58d4a9612
commit 18f6ff9eb7
5 changed files with 96 additions and 97 deletions
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52
ext/fts3/fts3_snippet.c
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@ -442,37 +442,39 @@ static int fts3BestSnippet(
sIter.nSnippet = nSnippet;
sIter.nPhrase = nList;
sIter.iCurrent = -1;
(void)fts3ExprIterate(pCsr->pExpr, fts3SnippetFindPositions, (void *)&sIter);
rc = fts3ExprIterate(pCsr->pExpr, fts3SnippetFindPositions, (void *)&sIter);
if( rc==SQLITE_OK ){
/* Set the *pmSeen output variable. */
for(i=0; i<nList; i++){
if( sIter.aPhrase[i].pHead ){
*pmSeen |= (u64)1 << i;
/* Set the *pmSeen output variable. */
for(i=0; i<nList; i++){
if( sIter.aPhrase[i].pHead ){
*pmSeen |= (u64)1 << i;
}
}
}
/* Loop through all candidate snippets. Store the best snippet in
** *pFragment. Store its associated 'score' in iBestScore.
*/
pFragment->iCol = iCol;
while( !fts3SnippetNextCandidate(&sIter) ){
int iPos;
int iScore;
u64 mCover;
u64 mHighlight;
fts3SnippetDetails(&sIter, mCovered, &iPos, &iScore, &mCover, &mHighlight);
assert( iScore>=0 );
if( iScore>iBestScore ){
pFragment->iPos = iPos;
pFragment->hlmask = mHighlight;
pFragment->covered = mCover;
iBestScore = iScore;
/* Loop through all candidate snippets. Store the best snippet in
** *pFragment. Store its associated 'score' in iBestScore.
*/
pFragment->iCol = iCol;
while( !fts3SnippetNextCandidate(&sIter) ){
int iPos;
int iScore;
u64 mCover;
u64 mHighlite;
fts3SnippetDetails(&sIter, mCovered, &iPos, &iScore, &mCover,&mHighlite);
assert( iScore>=0 );
if( iScore>iBestScore ){
pFragment->iPos = iPos;
pFragment->hlmask = mHighlite;
pFragment->covered = mCover;
iBestScore = iScore;
}
}
}
*piScore = iBestScore;
}
sqlite3_free(sIter.aPhrase);
*piScore = iBestScore;
return SQLITE_OK;
return rc;
}