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Overview
| Comment: | Fill in more of the matchinfo functions so that the BM25 function works. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | matchinfo |
| Files: | files | file ages | folders |
| SHA1: |
0e439483d78ef92af02d98bc98cfb28b |
| User & Date: | dan 2013-01-03 18:13:33 |
Context
|
2013-01-03
| ||
| 20:35 | Add comment describing format of row and global size records. check-in: 7cfa40b5c1 user: dan tags: matchinfo | |
| 18:13 | Fill in more of the matchinfo functions so that the BM25 function works. check-in: 0e439483d7 user: dan tags: matchinfo | |
|
2013-01-02
| ||
| 20:01 | Add an implementation of BM25 to fts5func.c. Other changes to matchinfo related things. check-in: 03f26d8c60 user: dan tags: matchinfo | |
Changes
Changes to src/fts5.c.
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KVCursor *pCsr; /* Cursor used to retrive values */
Mem *aMem; /* Array of column values */
/* Array of nPhrase*nCol integers. See sqlite4_mi_row_count() for details. */
int *anRow;
i64 *aGlobal;
};
/*
** This type is used when reading (decoding) an instance-list.
*/
typedef struct InstanceList InstanceList;
struct InstanceList {
................................................................................
}else{
rc = fts5LoadGlobal(pCsr->db, pCsr->pInfo, pCsr->aGlobal);
}
}
return rc;
}
/*
** Update an fts index.
*/
int sqlite4Fts5Update(
sqlite4 *db, /* Database handle */
Fts5Info *pInfo, /* Description of fts index to update */
................................................................................
return 0;
}
}
return (p->iCol==pFirst->iCol && p->iOff==iReq);
}
static int fts5StringFindInstances(Fts5Cursor *pCsr, int iCol, Fts5Str *pStr){
sqlite4 *db = pCsr->db;
int i;
int rc = SQLITE4_OK;
int bEof = 0;
int nByte = sizeof(InstanceList) * pStr->nToken;
InstanceList *aIn;
InstanceList out;
................................................................................
if( p1->iCol==p2->iCol && p1->iOff<p2->iOff && (p1->iOff+nNear)>=p2->iOff ){
return 1;
}
return 0;
}
static int fts5StringNearTrim(
Fts5Cursor *pCsr, /* Cursor object that owns both strings */
Fts5Str *pTrim, /* Trim this instance list */
Fts5Str *pNext, /* According to this one */
int nNear
){
if( pNext->nList==0 ){
pTrim->nList = 0;
}else{
................................................................................
** is set to true before returning.
**
** If the cursors do not point to a match, then *ppAdvance is set to
** the token of the individual cursor that should be advanced before
** retrying this function.
*/
static int fts5PhraseIsMatch(
Fts5Cursor *pCsr, /* Cursor that owns this string */
Fts5Phrase *pPhrase, /* Phrase to test */
int *pbMatch, /* OUT: True for a match, false otherwise */
Fts5Token **ppAdvance /* OUT: Token to advance before retrying */
){
const u8 *aPk1 = 0;
int nPk1 = 0;
int rc = SQLITE4_OK;
................................................................................
/* At this point, it is established that all of the token cursors in the
** phrase point to an entry with the same primary key. Now figure out if
** the various string constraints are met. Along the way, synthesize a
** position list for each Fts5Str object. */
for(i=0; rc==SQLITE4_OK && i<pPhrase->nStr; i++){
Fts5Str *pStr = &pPhrase->aStr[i];
rc = fts5StringFindInstances(pCsr, pPhrase->iCol, pStr);
}
/* Trim the instance lists according to any NEAR constraints. */
for(i=1; rc==SQLITE4_OK && i<pPhrase->nStr; i++){
int n = pPhrase->aiNear[i-1];
rc = fts5StringNearTrim(pCsr, &pPhrase->aStr[i], &pPhrase->aStr[i-1], n);
}
for(i=pPhrase->nStr-1; rc==SQLITE4_OK && i>0; i--){
int n = pPhrase->aiNear[i-1];
rc = fts5StringNearTrim(pCsr, &pPhrase->aStr[i-1], &pPhrase->aStr[i], n);
}
*pbMatch = (pPhrase->aStr[0].nList>0);
return rc;
}
static int fts5PhraseAdvanceToMatch(Fts5Cursor *pCsr, Fts5Phrase *pPhrase){
int rc;
do {
int bMatch;
Fts5Token *pAdvance = 0;
rc = fts5PhraseIsMatch(pCsr, pPhrase, &bMatch, &pAdvance);
if( rc!=SQLITE4_OK || bMatch ) break;
rc = fts5TokenAdvance(pCsr->db, pAdvance);
}while( rc==SQLITE4_OK );
return rc;
}
static int fts5ExprAdvance(Fts5Cursor *pCsr, Fts5ExprNode *p, int bFirst){
int rc = SQLITE4_OK;
switch( p->eType ){
case TOKEN_PRIMITIVE: {
Fts5Phrase *pPhrase = p->pPhrase;
if( bFirst==0 ){
rc = fts5TokenAdvance(pCsr->db, &pPhrase->aStr[0].aToken[0]);
}
if( rc==SQLITE4_OK ) rc = fts5PhraseAdvanceToMatch(pCsr, pPhrase);
if( rc==SQLITE4_OK ){
rc = fts5TokenPk(&pPhrase->aStr[0].aToken[0], &p->aPk, &p->nPk);
}else{
p->aPk = 0;
p->nPk = 0;
if( rc==SQLITE4_NOTFOUND ) rc = SQLITE4_OK;
}
break;
}
case TOKEN_AND:
p->aPk = 0;
p->nPk = 0;
rc = fts5ExprAdvance(pCsr, p->pLeft, bFirst);
if( rc==SQLITE4_OK ) rc = fts5ExprAdvance(pCsr, p->pRight, bFirst);
while( rc==SQLITE4_OK && p->pLeft->aPk && p->pRight->aPk ){
int res = fts5KeyCompare(
p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk
);
if( res<0 ){
rc = fts5ExprAdvance(pCsr, p->pLeft, 0);
}else if( res>0 ){
rc = fts5ExprAdvance(pCsr, p->pRight, 0);
}else{
p->aPk = p->pLeft->aPk;
p->nPk = p->pLeft->nPk;
break;
}
}
break;
................................................................................
int res = 0;
if( bFirst==0 ){
res = fts5KeyCompare(
p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk
);
}
if( res<=0 ) rc = fts5ExprAdvance(pCsr, p->pLeft, bFirst);
if( rc==SQLITE4_OK && res>=0 ){
rc = fts5ExprAdvance(pCsr, p->pRight, bFirst);
}
res = fts5KeyCompare(
p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk
);
if( res>0 ){
p->aPk = p->pRight->aPk;
................................................................................
default: assert( p->eType==TOKEN_NOT );
p->aPk = 0;
p->nPk = 0;
rc = fts5ExprAdvance(pCsr, p->pLeft, bFirst);
if( bFirst && rc==SQLITE4_OK ){
rc = fts5ExprAdvance(pCsr, p->pRight, bFirst);
}
while( rc==SQLITE4_OK && p->pLeft->aPk && p->pRight->aPk ){
int res = fts5KeyCompare(
p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk
);
if( res<0 ){
break;
}else if( res>0 ){
rc = fts5ExprAdvance(pCsr, p->pRight, 0);
}else{
rc = fts5ExprAdvance(pCsr, p->pLeft, 0);
}
}
p->aPk = p->pLeft->aPk;
p->nPk = p->pLeft->nPk;
break;
}
assert( rc!=SQLITE4_NOTFOUND );
return rc;
}
int sqlite4Fts5Next(Fts5Cursor *pCsr){
return fts5ExprAdvance(pCsr, pCsr->pExpr->pRoot, 0);
}
int sqlite4Fts5Open(
sqlite4 *db, /* Database handle */
Fts5Info *pInfo, /* Index description */
const char *zMatch, /* Match expression */
int bDesc, /* True to iterate in desc. order of PK */
................................................................................
pCsr = sqlite4DbMallocZero(db, sizeof(Fts5Cursor) + nMatch + 1);
if( !pCsr ){
rc = SQLITE4_NOMEM;
}else{
pCsr->zExpr = (char *)&pCsr[1];
memcpy(pCsr->zExpr, nMatch, zMatch);
pCsr->pInfo = pInfo;
pCsr->db = db;
rc = fts5ParseExpression(db, pInfo->pTokenizer, pInfo->p,
pInfo->iRoot, pInfo->azCol, pInfo->nCol, zMatch, &pCsr->pExpr, pzErr
);
}
................................................................................
** to point to the first entry in the range it will scan. */
rc = fts5OpenCursors(db, pInfo, pCsr);
}
if( rc!=SQLITE4_OK ){
sqlite4Fts5Close(db, pCsr);
pCsr = 0;
}else{
rc = fts5ExprAdvance(pCsr, pCsr->pExpr->pRoot, 1);
}
*ppCsr = pCsr;
return rc;
}
/*
** Return true if the cursor passed as the second argument currently points
................................................................................
rc = SQLITE4_MISUSE;
}
return rc;
}
int sqlite4_mi_column_size(sqlite4_context *pCtx, int iCol, int *pnToken){
int rc = SQLITE4_OK;
if( pCtx->pFts ){
}else{
rc = SQLITE4_MISUSE;
}
return rc;
}
int sqlite4_mi_column_value(
sqlite4_context *pCtx,
int iCol,
................................................................................
if( pCtx->pFts ){
*pnPhrase = pCtx->pFts->pExpr->nPhrase;
}else{
rc = SQLITE4_MISUSE;
}
return rc;
}
int sqlite4_mi_match_count(
sqlite4_context *pCtx,
int iCol,
int iPhrase,
int *pnMatch
){
int rc = SQLITE4_OK;
if( pCtx->pFts ){
}else{
rc = SQLITE4_MISUSE;
}
return rc;
}
int sqlite4_mi_match_offset(
sqlite4_context *pCtx,
int iCol,
int iPhrase,
int iMatch,
int *piOff
){
}
int sqlite4_mi_total_match_count(
sqlite4_context *pCtx,
int iCol,
int iPhrase,
int *pnMatch,
int *pnDoc,
int *pnRelevant
){
}
int sqlite4_mi_total_size(sqlite4_context *pCtx, int iCol, int *pnToken){
int rc = SQLITE4_OK;
if( pCtx->pFts ){
Fts5Cursor *pCsr = pCtx->pFts;
int nCol = pCsr->pInfo->nCol;
................................................................................
}
}
}else{
rc = SQLITE4_MISUSE;
}
return rc;
}
static int fts5CsrLoadRowcounts(Fts5Cursor *pCsr){
if( pCsr->anRow==0 ){
Fts5Expr *pExpr = pCsr->pExpr;
Fts5Info *pInfo = pCsr->pInfo;
int *anRow;
pCsr->anRow = anRow = (int *)sqlite4DbMallocZero(pCsr->db,
pExpr->nPhrase * pInfo->nCol * sizeof(int)
);
if( !anRow ) return SQLITE4_NOMEM;
}
}
int sqlite4_mi_row_count(
sqlite4_context *pCtx, /* Context object passed to mi function */
int iCol, /* Specific column (or -1) */
int iPhrase, /* Specific phrase (or -1) */
int *pnRow /* Total number of rows */
|
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KVCursor *pCsr; /* Cursor used to retrive values */ Mem *aMem; /* Array of column values */ /* Array of nPhrase*nCol integers. See sqlite4_mi_row_count() for details. */ int *anRow; i64 *aGlobal; /* Size of each column of current row (in tokens). */ int bSzValid; int *aSz; }; /* ** This type is used when reading (decoding) an instance-list. */ typedef struct InstanceList InstanceList; struct InstanceList { ................................................................................ }else{ rc = fts5LoadGlobal(pCsr->db, pCsr->pInfo, pCsr->aGlobal); } } return rc; } static int fts5CsrLoadSz(Fts5Cursor *pCsr){ sqlite4 *db = pCsr->db; Fts5Info *pInfo = pCsr->pInfo; int nVal = pInfo->nCol; int rc; u8 *aKey; int nKey = 0; int nPk = pCsr->pExpr->pRoot->nPk; KVCursor *pKVCsr = 0; /* Cursor used to read global record */ aKey = (u8 *)sqlite4DbMallocZero(db, 10 + nPk); if( !aKey ) return SQLITE4_NOMEM; nKey = putVarint32(aKey, pInfo->iRoot); aKey[nKey++] = 0x00; memcpy(&aKey[nKey], pCsr->pExpr->pRoot->aPk, nPk); nKey += nPk; rc = sqlite4KVStoreOpenCursor(db->aDb[pInfo->iDb].pKV, &pKVCsr); if( rc==SQLITE4_OK ){ rc = sqlite4KVCursorSeek(pKVCsr, aKey, nKey, 0); if( rc==SQLITE4_NOTFOUND ){ rc = SQLITE4_CORRUPT_BKPT; }else if( rc==SQLITE4_OK ){ const u8 *aData = 0; int nData = 0; rc = sqlite4KVCursorData(pKVCsr, 0, -1, &aData, &nData); if( rc==SQLITE4_OK ){ int i; int iOff = 0; for(i=0; i<nVal; i++){ iOff += getVarint32(&aData[iOff], pCsr->aSz[i]); } } pCsr->bSzValid = 1; } sqlite4KVCursorClose(pKVCsr); } return rc; } /* ** Update an fts index. */ int sqlite4Fts5Update( sqlite4 *db, /* Database handle */ Fts5Info *pInfo, /* Description of fts index to update */ ................................................................................ return 0; } } return (p->iCol==pFirst->iCol && p->iOff==iReq); } static int fts5StringFindInstances(sqlite4 *db, int iCol, Fts5Str *pStr){ int i; int rc = SQLITE4_OK; int bEof = 0; int nByte = sizeof(InstanceList) * pStr->nToken; InstanceList *aIn; InstanceList out; ................................................................................ if( p1->iCol==p2->iCol && p1->iOff<p2->iOff && (p1->iOff+nNear)>=p2->iOff ){ return 1; } return 0; } static int fts5StringNearTrim( Fts5Str *pTrim, /* Trim this instance list */ Fts5Str *pNext, /* According to this one */ int nNear ){ if( pNext->nList==0 ){ pTrim->nList = 0; }else{ ................................................................................ ** is set to true before returning. ** ** If the cursors do not point to a match, then *ppAdvance is set to ** the token of the individual cursor that should be advanced before ** retrying this function. */ static int fts5PhraseIsMatch( sqlite4 *db, /* Database handle */ Fts5Phrase *pPhrase, /* Phrase to test */ int *pbMatch, /* OUT: True for a match, false otherwise */ Fts5Token **ppAdvance /* OUT: Token to advance before retrying */ ){ const u8 *aPk1 = 0; int nPk1 = 0; int rc = SQLITE4_OK; ................................................................................ /* At this point, it is established that all of the token cursors in the ** phrase point to an entry with the same primary key. Now figure out if ** the various string constraints are met. Along the way, synthesize a ** position list for each Fts5Str object. */ for(i=0; rc==SQLITE4_OK && i<pPhrase->nStr; i++){ Fts5Str *pStr = &pPhrase->aStr[i]; rc = fts5StringFindInstances(db, pPhrase->iCol, pStr); } /* Trim the instance lists according to any NEAR constraints. */ for(i=1; rc==SQLITE4_OK && i<pPhrase->nStr; i++){ int n = pPhrase->aiNear[i-1]; rc = fts5StringNearTrim(&pPhrase->aStr[i], &pPhrase->aStr[i-1], n); } for(i=pPhrase->nStr-1; rc==SQLITE4_OK && i>0; i--){ int n = pPhrase->aiNear[i-1]; rc = fts5StringNearTrim(&pPhrase->aStr[i-1], &pPhrase->aStr[i], n); } *pbMatch = (pPhrase->aStr[0].nList>0); return rc; } static int fts5PhraseAdvanceToMatch(sqlite4 *db, Fts5Phrase *pPhrase){ int rc; do { int bMatch; Fts5Token *pAdvance = 0; rc = fts5PhraseIsMatch(db, pPhrase, &bMatch, &pAdvance); if( rc!=SQLITE4_OK || bMatch ) break; rc = fts5TokenAdvance(db, pAdvance); }while( rc==SQLITE4_OK ); return rc; } static int fts5ExprAdvance(sqlite4 *db, Fts5ExprNode *p, int bFirst){ int rc = SQLITE4_OK; switch( p->eType ){ case TOKEN_PRIMITIVE: { Fts5Phrase *pPhrase = p->pPhrase; if( bFirst==0 ){ rc = fts5TokenAdvance(db, &pPhrase->aStr[0].aToken[0]); } if( rc==SQLITE4_OK ) rc = fts5PhraseAdvanceToMatch(db, pPhrase); if( rc==SQLITE4_OK ){ rc = fts5TokenPk(&pPhrase->aStr[0].aToken[0], &p->aPk, &p->nPk); }else{ p->aPk = 0; p->nPk = 0; if( rc==SQLITE4_NOTFOUND ) rc = SQLITE4_OK; } break; } case TOKEN_AND: p->aPk = 0; p->nPk = 0; rc = fts5ExprAdvance(db, p->pLeft, bFirst); if( rc==SQLITE4_OK ) rc = fts5ExprAdvance(db, p->pRight, bFirst); while( rc==SQLITE4_OK && p->pLeft->aPk && p->pRight->aPk ){ int res = fts5KeyCompare( p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk ); if( res<0 ){ rc = fts5ExprAdvance(db, p->pLeft, 0); }else if( res>0 ){ rc = fts5ExprAdvance(db, p->pRight, 0); }else{ p->aPk = p->pLeft->aPk; p->nPk = p->pLeft->nPk; break; } } break; ................................................................................ int res = 0; if( bFirst==0 ){ res = fts5KeyCompare( p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk ); } if( res<=0 ) rc = fts5ExprAdvance(db, p->pLeft, bFirst); if( rc==SQLITE4_OK && res>=0 ){ rc = fts5ExprAdvance(db, p->pRight, bFirst); } res = fts5KeyCompare( p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk ); if( res>0 ){ p->aPk = p->pRight->aPk; ................................................................................ default: assert( p->eType==TOKEN_NOT ); p->aPk = 0; p->nPk = 0; rc = fts5ExprAdvance(db, p->pLeft, bFirst); if( bFirst && rc==SQLITE4_OK ){ rc = fts5ExprAdvance(db, p->pRight, bFirst); } while( rc==SQLITE4_OK && p->pLeft->aPk && p->pRight->aPk ){ int res = fts5KeyCompare( p->pLeft->aPk, p->pLeft->nPk, p->pRight->aPk, p->pRight->nPk ); if( res<0 ){ break; }else if( res>0 ){ rc = fts5ExprAdvance(db, p->pRight, 0); }else{ rc = fts5ExprAdvance(db, p->pLeft, 0); } } p->aPk = p->pLeft->aPk; p->nPk = p->pLeft->nPk; break; } assert( rc!=SQLITE4_NOTFOUND ); return rc; } int sqlite4Fts5Next(Fts5Cursor *pCsr){ pCsr->bSzValid = 0; return fts5ExprAdvance(pCsr->db, pCsr->pExpr->pRoot, 0); } int sqlite4Fts5Open( sqlite4 *db, /* Database handle */ Fts5Info *pInfo, /* Index description */ const char *zMatch, /* Match expression */ int bDesc, /* True to iterate in desc. order of PK */ ................................................................................ pCsr = sqlite4DbMallocZero(db, sizeof(Fts5Cursor) + nMatch + 1); if( !pCsr ){ rc = SQLITE4_NOMEM; }else{ pCsr->zExpr = (char *)&pCsr[1]; memcpy(pCsr->zExpr, zMatch, nMatch); pCsr->pInfo = pInfo; pCsr->db = db; rc = fts5ParseExpression(db, pInfo->pTokenizer, pInfo->p, pInfo->iRoot, pInfo->azCol, pInfo->nCol, zMatch, &pCsr->pExpr, pzErr ); } ................................................................................ ** to point to the first entry in the range it will scan. */ rc = fts5OpenCursors(db, pInfo, pCsr); } if( rc!=SQLITE4_OK ){ sqlite4Fts5Close(db, pCsr); pCsr = 0; }else{ rc = fts5ExprAdvance(db, pCsr->pExpr->pRoot, 1); } *ppCsr = pCsr; return rc; } /* ** Return true if the cursor passed as the second argument currently points ................................................................................ rc = SQLITE4_MISUSE; } return rc; } int sqlite4_mi_column_size(sqlite4_context *pCtx, int iCol, int *pnToken){ int rc = SQLITE4_OK; Fts5Cursor *pCsr = pCtx->pFts; if( pCsr==0 ){ rc = SQLITE4_MISUSE; }else if( iCol>=pCsr->pInfo->nCol ){ rc = SQLITE4_ERROR; }else{ if( pCsr->aSz==0 ){ pCsr->aSz = (int *)sqlite4DbMallocZero( pCsr->db, sizeof(int)*pCsr->pInfo->nCol ); if( pCsr->aSz==0 ) rc = SQLITE4_NOMEM; } if( rc==SQLITE4_OK && pCsr->bSzValid==0 ){ rc = fts5CsrLoadSz(pCsr); } if( rc==SQLITE4_OK ){ assert( pCsr->bSzValid ); if( iCol>=0 ){ *pnToken = pCsr->aSz[iCol]; }else{ int i; int nToken = 0; for(i=0; i<pCsr->pInfo->nCol; i++){ nToken += pCsr->aSz[i]; } *pnToken = nToken; } } } return rc; } int sqlite4_mi_column_value( sqlite4_context *pCtx, int iCol, ................................................................................ if( pCtx->pFts ){ *pnPhrase = pCtx->pFts->pExpr->nPhrase; }else{ rc = SQLITE4_MISUSE; } return rc; } static Fts5Str *fts5FindStr(Fts5ExprNode *p, int *piStr){ Fts5Str *pRet = 0; if( p->eType==TOKEN_PRIMITIVE ){ int iStr = *piStr; if( iStr<p->pPhrase->nStr ){ pRet = &p->pPhrase->aStr[iStr]; }else{ *piStr = iStr - p->pPhrase->nStr; } }else{ pRet = fts5FindStr(p->pLeft, piStr); if( pRet==0 ) pRet = fts5FindStr(p->pRight, piStr); } return pRet; } int sqlite4_mi_match_count( sqlite4_context *pCtx, int iCol, int iPhrase, int *pnMatch ){ int rc = SQLITE4_OK; Fts5Cursor *pCsr = pCtx->pFts; if( pCsr ){ int nMatch = 0; Fts5Str *pStr; int iCopy = iCol; InstanceList sList; pStr = fts5FindStr(pCsr->pExpr->pRoot, &iCopy); assert( pStr ); fts5InstanceListInit(pStr->aList, pStr->nList, &sList); while( 0==fts5InstanceListNext(&sList) ){ if( iCol<0 || sList.iCol==iCol ) nMatch++; } *pnMatch = nMatch; }else{ rc = SQLITE4_MISUSE; } return rc; } int sqlite4_mi_match_offset( sqlite4_context *pCtx, int iCol, int iPhrase, int iMatch, int *piOff ){ return SQLITE4_OK; } int sqlite4_mi_total_match_count( sqlite4_context *pCtx, int iCol, int iPhrase, int *pnMatch, int *pnDoc, int *pnRelevant ){ return SQLITE4_OK; } int sqlite4_mi_total_size(sqlite4_context *pCtx, int iCol, int *pnToken){ int rc = SQLITE4_OK; if( pCtx->pFts ){ Fts5Cursor *pCsr = pCtx->pFts; int nCol = pCsr->pInfo->nCol; ................................................................................ } } }else{ rc = SQLITE4_MISUSE; } return rc; } static void fts5StrLoadRowcounts(Fts5Str *pStr, int *anRow){ InstanceList sList; fts5InstanceListInit(pStr->aList, pStr->nList, &sList); while( 0==fts5InstanceListNext(&sList) ){ anRow[sList.iCol]++; } } static int fts5ExprLoadRowcounts( sqlite4 *db, Fts5Info *pInfo, Fts5ExprNode *pNode, int **panRow ){ int rc = SQLITE4_OK; if( pNode ){ if( pNode->eType==TOKEN_PRIMITIVE ){ int *anRow = *panRow; Fts5Phrase *pPhrase = pNode->pPhrase; rc = fts5ExprAdvance(db, pNode, 1); while( rc==SQLITE4_OK ){ int i; for(i=0; i<pPhrase->nStr; i++){ fts5StrLoadRowcounts(&pPhrase->aStr[i], &anRow[i*pInfo->nCol]); } rc = fts5ExprAdvance(db, pNode, 0); } *panRow = &anRow[pInfo->nCol * pPhrase->nStr]; } if( rc==SQLITE4_OK ){ rc = fts5ExprLoadRowcounts(db, pInfo, pNode->pLeft, panRow); } if( rc==SQLITE4_OK ){ rc = fts5ExprLoadRowcounts(db, pInfo, pNode->pLeft, panRow); } } return rc; } static int fts5CsrLoadRowcounts(Fts5Cursor *pCsr){ int rc = SQLITE4_OK; if( pCsr->anRow==0 ){ sqlite4 *db = pCsr->db; Fts5Expr *pCopy; Fts5Expr *pExpr = pCsr->pExpr; Fts5Info *pInfo = pCsr->pInfo; int *anRow; pCsr->anRow = anRow = (int *)sqlite4DbMallocZero(db, pExpr->nPhrase * pInfo->nCol * sizeof(int) ); if( !anRow ) return SQLITE4_NOMEM; rc = fts5ParseExpression(db, pInfo->pTokenizer, pInfo->p, pInfo->iRoot, pInfo->azCol, pInfo->nCol, pCsr->zExpr, &pCopy, 0 ); if( rc==SQLITE4_OK ){ rc = fts5OpenExprCursors(db, pInfo, pExpr->pRoot); } if( rc==SQLITE4_OK ){ rc = fts5ExprLoadRowcounts(db, pInfo, pCopy->pRoot, &anRow); } fts5ExpressionFree(db, pCopy); } return rc; } int sqlite4_mi_row_count( sqlite4_context *pCtx, /* Context object passed to mi function */ int iCol, /* Specific column (or -1) */ int iPhrase, /* Specific phrase (or -1) */ int *pnRow /* Total number of rows */ |
Changes to src/fts5func.c.
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**
** http://xapian.org/docs/bm25.html
**
** http://en.wikipedia.org/wiki/Okapi_BM25
*/
#include "sqliteInt.h"
static char fts5Tolower(char c){
if( c>='A' && c<='Z' ) c = c + ('a' - 'A');
return c;
}
static int fts5SimpleCreate(
|
> |
19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 |
**
** http://xapian.org/docs/bm25.html
**
** http://en.wikipedia.org/wiki/Okapi_BM25
*/
#include "sqliteInt.h"
#include <math.h> /* temporary: For log() */
static char fts5Tolower(char c){
if( c>='A' && c<='Z' ) c = c + ('a' - 'A');
return c;
}
static int fts5SimpleCreate(
|
Changes to src/sqlite.h.in.
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** in column iCol, or in any column if iCol is negative. ** ** If parameter iPhrase is equal to or greater than the number of phrases ** in the current query, or if iCol is equal to or greater than the number ** of columns in the indexed table, SQLITE4_MISUSE is returned. The value ** of the output parameter is undefined in this case. */ int sqlite4_mi_column_count(sqlite4_context *, int *pnCol); int sqlite4_mi_column_size(sqlite4_context *, int iCol, int *pnToken); int sqlite4_mi_column_value(sqlite4_context *, int iCol, sqlite4_value **ppVal); int sqlite4_mi_phrase_count(sqlite4_context *, int *pnPhrase); int sqlite4_mi_match_count(sqlite4_context *, int iCol, int iPhrase, int *pn); int sqlite4_mi_match_detail(sqlite4_context *, int iCol, int iPhrase, int iMatch, int *piOff, int *piWeight ); int sqlite4_mi_total_size(sqlite4_context *, int iCol, int *pnToken); int sqlite4_mi_row_count(sqlite4_context *, int iCol, int iPhrase, int *pnRow); /* ** Undo the hack that converts floating point types to integer for ** builds on processors without floating point support. */ #ifdef SQLITE4_OMIT_FLOATING_POINT # undef double #endif #ifdef __cplusplus } /* End of the 'extern "C"' block */ #endif #endif |
> > > > | < | | | < < |
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** in column iCol, or in any column if iCol is negative. ** ** If parameter iPhrase is equal to or greater than the number of phrases ** in the current query, or if iCol is equal to or greater than the number ** of columns in the indexed table, SQLITE4_MISUSE is returned. The value ** of the output parameter is undefined in this case. */ int sqlite4_mi_column_count(sqlite4_context *, int *pnCol); int sqlite4_mi_phrase_count(sqlite4_context *, int *pnPhrase); int sqlite4_mi_column_size(sqlite4_context *, int iCol, int *pnToken); int sqlite4_mi_match_count(sqlite4_context *, int iCol, int iPhrase, int *pn); int sqlite4_mi_total_size(sqlite4_context *, int iCol, int *pnToken); int sqlite4_mi_row_count(sqlite4_context *, int iCol, int iPhrase, int *pnRow); int sqlite4_mi_column_value(sqlite4_context *, int iCol, sqlite4_value **ppVal); int sqlite4_mi_match_detail(sqlite4_context *, int iCol, int iPhrase, int iMatch, int *piOff, int *piWeight ); /* ** Undo the hack that converts floating point types to integer for ** builds on processors without floating point support. */ #ifdef SQLITE4_OMIT_FLOATING_POINT # undef double #endif #ifdef __cplusplus } /* End of the 'extern "C"' block */ #endif #endif |