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Fix fts5_index.c to use doclist-indexes when possible. Only some cases work so far.

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FossilOrigin-Name: 90b82d3ef613b2915e0e280dc1d2e5a2b617d59c
This commit is contained in:
dan
2014-08-04 20:07:40 +00:00
parent 9af0705e84
commit 9a67058a63
5 changed files with 452 additions and 136 deletions
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530
ext/fts5/fts5_index.c
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@ -266,6 +266,7 @@ typedef struct Fts5BtreeIter Fts5BtreeIter;
typedef struct Fts5BtreeIterLevel Fts5BtreeIterLevel;
typedef struct Fts5ChunkIter Fts5ChunkIter;
typedef struct Fts5Data Fts5Data;
typedef struct Fts5DlidxIter Fts5DlidxIter;
typedef struct Fts5MultiSegIter Fts5MultiSegIter;
typedef struct Fts5NodeIter Fts5NodeIter;
typedef struct Fts5PageWriter Fts5PageWriter;
@ -279,7 +280,6 @@ typedef struct Fts5Structure Fts5Structure;
typedef struct Fts5StructureLevel Fts5StructureLevel;
typedef struct Fts5StructureSegment Fts5StructureSegment;
/*
** One object per %_data table.
*/
@ -321,6 +321,9 @@ struct Fts5DoclistIter {
int nPoslist;
};
/*
** Each iterator used by external modules is an instance of this type.
*/
struct Fts5IndexIter {
Fts5Index *pIndex;
Fts5Structure *pStruct;
@ -489,6 +492,8 @@ struct Fts5SegIter {
int nRowidOffset; /* Allocated size of aRowidOffset[] array */
int *aRowidOffset; /* Array of offset to rowid fields */
Fts5DlidxIter *pDlidx; /* If there is a doclist-index */
/* Variables populated based on current entry. */
Fts5Buffer term; /* Current term */
i64 iRowid; /* Current rowid */
@ -540,6 +545,26 @@ struct Fts5NodeIter {
int bDlidx;
};
/*
** An instance of the following type is used to iterate through the contents
** of a doclist-index record.
**
** pData:
** A reference to the dlidx record.
*/
struct Fts5DlidxIter {
Fts5Data *pData; /* Data for doclist index, if any */
int iOff; /* Current offset into pDlidx */
int bRowidValid; /* iRowid is valid */
int bEof; /* At EOF already */
/* Output variables */
int iLeafPgno; /* Page number of current leaf page */
int bZero; /* True if current leaf has no rowids */
i64 iRowid; /* If bZero==0, first rowid on leaf */
};
/*
** An Fts5BtreeIter object is used to iterate through all entries in the
** b-tree hierarchy belonging to a single fts5 segment. In this case the
@ -577,6 +602,55 @@ struct Fts5BtreeIter {
int bDlidx; /* True if there exists a dlidx */
};
/*
** Decode a segment-data rowid from the %_data table. This function is
** the opposite of macro FTS5_SEGMENT_ROWID().
*/
static void fts5DecodeRowid(
i64 iRowid, /* Rowid from %_data table */
int *piIdx, /* OUT: Index */
int *piSegid, /* OUT: Segment id */
int *piHeight, /* OUT: Height */
int *piPgno /* OUT: Page number */
){
*piPgno = (int)(iRowid & (((i64)1 << FTS5_DATA_PAGE_B) - 1));
iRowid >>= FTS5_DATA_PAGE_B;
*piHeight = (int)(iRowid & (((i64)1 << FTS5_DATA_HEIGHT_B) - 1));
iRowid >>= FTS5_DATA_HEIGHT_B;
*piSegid = (int)(iRowid & (((i64)1 << FTS5_DATA_ID_B) - 1));
iRowid >>= FTS5_DATA_ID_B;
*piIdx = (int)(iRowid & (((i64)1 << FTS5_DATA_IDX_B) - 1));
}
static void fts5DebugRowid(int *pRc, Fts5Buffer *pBuf, i64 iKey){
int iIdx,iSegid,iHeight,iPgno; /* Rowid compenents */
fts5DecodeRowid(iKey, &iIdx, &iSegid, &iHeight, &iPgno);
if( iSegid==0 ){
if( iKey==FTS5_AVERAGES_ROWID ){
sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "(averages) ");
}else{
sqlite3Fts5BufferAppendPrintf(pRc, pBuf,
"(structure idx=%d)", (int)(iKey-10)
);
}
}
else if( iHeight==FTS5_SEGMENT_MAX_HEIGHT ){
sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "(dlidx idx=%d segid=%d pgno=%d)",
iIdx, iSegid, iPgno
);
}else{
sqlite3Fts5BufferAppendPrintf(pRc, pBuf, "(idx=%d segid=%d h=%d pgno=%d)",
iIdx, iSegid, iHeight, iPgno
);
}
}
static void fts5PutU16(u8 *aOut, u16 iVal){
aOut[0] = (iVal>>8);
aOut[1] = (iVal&0xFF);
@ -666,7 +740,15 @@ static Fts5Data *fts5DataReadOrBuffer(
){
Fts5Data *pRet = 0;
if( p->rc==SQLITE_OK ){
int rc;
int rc = SQLITE_OK;
#if 0
Fts5Buffer buf = {0,0,0};
fts5DebugRowid(&rc, &buf, iRowid);
fprintf(stdout, "read: %s\n", buf.p);
fflush(stdout);
sqlite3_free(buf.p);
#endif
/* If the blob handle is not yet open, open and seek it. Otherwise, use
** the blob_reopen() API to reseek the existing blob handle. */
@ -1041,6 +1123,115 @@ static void fts5NodeIterFree(Fts5NodeIter *pIter){
fts5BufferFree(&pIter->term);
}
/*
** Return non-zero if EOF is reached.
*/
static int fts5DlidxIterNext(Fts5DlidxIter *pIter, int bRev){
if( bRev ){
i64 iVal;
int iOff = pIter->iOff;
int iLimit;
u8 *a = pIter->pData->p;
/* Currently iOff points to the first byte of a varint. This block
** decrements iOff until it points to the first byte of the previous
** varint. Taking care not to read any memory locations that occur
** before the buffer in memory. */
iLimit = (iOff>9 ? iOff-9 : 0);
for(iOff--; iOff>iLimit; iOff--){
if( (a[iOff-1] & 0x80)==0 ) break;
}
pIter->iOff = iOff;
if( iOff<=0 ){
pIter->bEof = 1;
return 1;
}
getVarint(&a[iOff], (u64*)&iVal);
if( iVal==0 ){
pIter->bZero = 1;
}else if( iOff==0 ){
pIter->iRowid = iVal;
}else{
pIter->iRowid += iVal;
}
pIter->iLeafPgno--;
}else{
i64 iVal;
if( pIter->iOff>=pIter->pData->n ){
pIter->bEof = 1;
return 1;
}
pIter->iOff += getVarint(&pIter->pData->p[pIter->iOff], (u64*)&iVal);
if( iVal==0 ){
pIter->bZero = 1;
}else{
pIter->bZero = 0;
if( pIter->bRowidValid ){
pIter->iRowid -= iVal;
}else{
pIter->bRowidValid = 1;
pIter->iRowid = iVal;
}
}
pIter->iLeafPgno++;
}
return 0;
}
static void fts5DlidxIterLast(Fts5DlidxIter *pIter){
while( 0==fts5DlidxIterNext(pIter, 0) );
assert( pIter->iOff==pIter->pData->n && pIter->bEof==1 );
pIter->bEof = 0;
}
static int fts5DlidxIterEof(Fts5Index *p, Fts5DlidxIter *pIter){
return (p->rc!=SQLITE_OK || pIter->bEof);
}
static void fts5DlidxIterInit(
Fts5Index *p, /* Fts5 Backend to iterate within */
int bRev, /* True for ORDER BY ASC */
int iIdx, int iSegid, /* Segment iSegid within index iIdx */
int iLeafPgno, /* Leaf page number to load dlidx for */
Fts5DlidxIter **ppIter /* OUT: Populated iterator */
){
Fts5DlidxIter *pIter = *ppIter;
Fts5Data *pDlidx;
pDlidx = fts5DataRead(p, FTS5_DOCLIST_IDX_ROWID(iIdx, iSegid, iLeafPgno));
if( pDlidx==0 ) return;
if( pIter==0 ){
*ppIter = pIter = (Fts5DlidxIter*)fts5IdxMalloc(p, sizeof(Fts5DlidxIter));
if( pIter==0 ){
fts5DataRelease(pDlidx);
return;
}
}else{
memset(pIter, 0, sizeof(Fts5DlidxIter));
}
pIter->pData = pDlidx;
pIter->iLeafPgno = iLeafPgno;
if( bRev==0 ){
fts5DlidxIterNext(pIter, 0);
}else{
fts5DlidxIterLast(pIter);
}
}
/*
** Free a doclist-index iterator object allocated by fts5DlidxIterInit().
*/
static void fts5DlidxIterFree(Fts5DlidxIter *pIter){
if( pIter ){
fts5DataRelease(pIter->pData);
sqlite3_free(pIter);
}
}
/*
** Load the next leaf page into the segment iterator.
*/
@ -1175,6 +1366,50 @@ static void fts5SegIterReverseInitPage(Fts5Index *p, Fts5SegIter *pIter){
pIter->iRowidOffset = iRowidOffset;
}
/*
**
*/
static void fts5SegIterReverseNewPage(Fts5Index *p, Fts5SegIter *pIter){
assert( pIter->flags & FTS5_SEGITER_REVERSE );
assert( pIter->flags & FTS5_SEGITER_ONETERM );
fts5DataRelease(pIter->pLeaf);
pIter->pLeaf = 0;
while( p->rc==SQLITE_OK && pIter->iLeafPgno>pIter->iTermLeafPgno ){
Fts5Data *pNew;
pIter->iLeafPgno--;
pNew = fts5DataRead(p, FTS5_SEGMENT_ROWID(
pIter->iIdx, pIter->pSeg->iSegid, 0, pIter->iLeafPgno
));
if( pNew ){
if( pIter->iLeafPgno==pIter->iTermLeafPgno ){
if( pIter->iTermLeafOffset<pNew->n ){
pIter->pLeaf = pNew;
pIter->iLeafOffset = pIter->iTermLeafOffset;
}
}else{
int iRowidOff, dummy;
fts5LeafHeader(pNew, &iRowidOff, &dummy);
if( iRowidOff ){
pIter->pLeaf = pNew;
pIter->iLeafOffset = iRowidOff;
}
}
if( pIter->pLeaf ){
u8 *a = &pIter->pLeaf->p[pIter->iLeafOffset];
pIter->iLeafOffset += getVarint(a, (u64*)&pIter->iRowid);
break;
}else{
fts5DataRelease(pNew);
}
}
}
if( pIter->pLeaf ){
fts5SegIterReverseInitPage(p, pIter);
}
}
/*
** Advance iterator pIter to the next entry.
@ -1202,6 +1437,8 @@ static void fts5SegIterNext(
getVarint(&a[iOff], (u64*)&iDelta);
pIter->iRowid += iDelta;
}else{
fts5SegIterReverseNewPage(p, pIter);
#if 0
fts5DataRelease(pIter->pLeaf);
pIter->pLeaf = 0;
while( p->rc==SQLITE_OK && pIter->iLeafPgno>pIter->iTermLeafPgno ){
@ -1238,6 +1475,7 @@ static void fts5SegIterNext(
if( pIter->pLeaf ){
fts5SegIterReverseInitPage(p, pIter);
}
#endif
}
}else{
Fts5Data *pLeaf = pIter->pLeaf;
@ -1380,6 +1618,42 @@ static void fts5SegIterReverse(Fts5Index *p, int iIdx, Fts5SegIter *pIter){
pIter->flags |= FTS5_SEGITER_REVERSE;
}
/*
** Iterator pIter currently points to the first rowid of a doclist within
** index iIdx. There is a doclist-index associated with the final term on
** the current page. If the current term is the last term on the page,
** load the doclist-index from disk and initialize an iterator at
** (pIter->pDlidx).
*/
static void fts5SegIterLoadDlidx(Fts5Index *p, int iIdx, Fts5SegIter *pIter){
int iSegid = pIter->pSeg->iSegid;
int bRev = (pIter->flags & FTS5_SEGITER_REVERSE);
Fts5Data *pLeaf = pIter->pLeaf; /* Current leaf data */
int iOff = pIter->iLeafOffset; /* Byte offset within current leaf */
assert( pIter->flags & FTS5_SEGITER_ONETERM );
assert( pIter->pDlidx==0 );
/* Check if the current doclist ends on this page. If it does, return
** early without loading the doclist-index (as it belongs to a different
** term. */
while( iOff<pLeaf->n ){
i64 iDelta;
int nPoslist;
/* iOff is currently the offset of the size field of a position list. */
iOff += getVarint32(&pLeaf->p[iOff], nPoslist);
iOff += nPoslist;
if( iOff<pLeaf->n ){
iOff += getVarint(&pLeaf->p[iOff], (u64*)&iDelta);
if( iDelta==0 ) return;
}
}
fts5DlidxIterInit(p, bRev, iIdx, iSegid, pIter->iLeafPgno, &pIter->pDlidx);
}
/*
** Initialize the object pIter to point to term pTerm/nTerm within segment
** pSeg, index iIdx. If there is no such term in the index, the iterator
@ -1399,6 +1673,7 @@ static void fts5SegIterSeekInit(
int iPg = 1;
int h;
int bGe = ((flags & FTS5INDEX_QUERY_PREFIX) && iIdx==0);
int bDlidx = 0; /* True if there is a doclist-index */
assert( bGe==0 || (flags & FTS5INDEX_QUERY_ASC)==0 );
assert( pTerm && nTerm );
@ -1418,11 +1693,13 @@ static void fts5SegIterSeekInit(
assert( node.term.n==0 );
iPg = node.iChild;
bDlidx = node.bDlidx;
for(fts5NodeIterNext(&p->rc, &node);
node.aData && fts5BufferCompareBlob(&node.term, pTerm, nTerm)<=0;
fts5NodeIterNext(&p->rc, &node)
){
iPg = node.iChild;
bDlidx = node.bDlidx;
}
fts5NodeIterFree(&node);
fts5DataRelease(pNode);
@ -1430,6 +1707,7 @@ static void fts5SegIterSeekInit(
if( iPg<pSeg->pgnoFirst ){
iPg = pSeg->pgnoFirst;
bDlidx = 0;
}
pIter->iLeafPgno = iPg - 1;
@ -1454,8 +1732,13 @@ static void fts5SegIterSeekInit(
if( bGe==0 ){
pIter->flags |= FTS5_SEGITER_ONETERM;
if( pIter->pLeaf && (flags & FTS5INDEX_QUERY_ASC) ){
fts5SegIterReverse(p, iIdx, pIter);
if( pIter->pLeaf ){
if( bDlidx ){
fts5SegIterLoadDlidx(p, iIdx, pIter);
}
if( flags & FTS5INDEX_QUERY_ASC ){
fts5SegIterReverse(p, iIdx, pIter);
}
}
}
}
@ -1466,6 +1749,7 @@ static void fts5SegIterSeekInit(
static void fts5SegIterClear(Fts5SegIter *pIter){
fts5BufferFree(&pIter->term);
fts5DataRelease(pIter->pLeaf);
fts5DlidxIterFree(pIter->pDlidx);
sqlite3_free(pIter->aRowidOffset);
memset(pIter, 0, sizeof(Fts5SegIter));
}
@ -1551,6 +1835,84 @@ static void fts5MultiIterAdvanced(
}
}
/*
** Move the seg-iter so that it points to the first rowid on page iLeafPgno.
** It is an error if leaf iLeafPgno contains no rowid.
*/
static void fts5SegIterGotoPage(
Fts5Index *p, /* FTS5 backend object */
Fts5SegIter *pIter, /* Iterator to advance */
int iLeafPgno
){
assert( iLeafPgno>pIter->iLeafPgno );
if( p->rc==SQLITE_OK ){
pIter->iLeafPgno = iLeafPgno-1;
fts5SegIterNextPage(p, pIter);
assert( p->rc!=SQLITE_OK || pIter->iLeafPgno==iLeafPgno );
}
if( p->rc==SQLITE_OK ){
int iOff;
u8 *a = pIter->pLeaf->p;
int n = pIter->pLeaf->n;
iOff = fts5GetU16(&a[0]);
if( iOff<4 || iOff>=n ){
p->rc = FTS5_CORRUPT;
}else{
iOff += getVarint(&a[iOff], (u64*)&pIter->iRowid);
pIter->iLeafOffset = iOff;
}
}
}
/*
** Advance the iterator passed as the second argument until it is at or
** past rowid iFrom. Regardless of the value of iFrom, the iterator is
** always advanced at least once.
*/
static void fts5SegIterNextFrom(
Fts5Index *p, /* FTS5 backend object */
Fts5SegIter *pIter, /* Iterator to advance */
i64 iMatch /* Advance iterator at least this far */
){
int bRev = (pIter->flags & FTS5_SEGITER_REVERSE);
Fts5DlidxIter *pDlidx = pIter->pDlidx;
int iLeafPgno = pIter->iLeafPgno;
assert( pIter->flags & FTS5_SEGITER_ONETERM );
assert( pIter->pDlidx );
assert( pIter->pLeaf );
if( bRev==0 ){
while( fts5DlidxIterEof(p, pDlidx)==0 && iMatch<pDlidx->iRowid ){
if( pDlidx->bZero==0 ) iLeafPgno = pDlidx->iLeafPgno;
fts5DlidxIterNext(pDlidx, 0);
}
assert( iLeafPgno>=pIter->iLeafPgno || p->rc );
if( iLeafPgno>pIter->iLeafPgno ){
fts5SegIterGotoPage(p, pIter, iLeafPgno);
}
}else if( 0 ){
while( fts5DlidxIterEof(p, pDlidx)==0 && iMatch>pDlidx->iRowid ){
fts5DlidxIterNext(pDlidx, 0);
if( pDlidx->bZero==0 ) iLeafPgno = pDlidx->iLeafPgno;
}
assert( iLeafPgno<=pIter->iLeafPgno || p->rc );
if( iLeafPgno<pIter->iLeafPgno ){
fts5SegIterGotoPage(p, pIter, iLeafPgno);
}
}
while( 1 ){
fts5SegIterNext(p, pIter);
if( pIter->pLeaf==0 ) break;
if( bRev==0 && pIter->iRowid<=iMatch ) break;
if( bRev!=0 && pIter->iRowid>=iMatch ) break;
}
}
/*
** Move the iterator to the next entry.
**
@ -1558,10 +1920,20 @@ static void fts5MultiIterAdvanced(
** considered an error if the iterator reaches EOF, or if it is already at
** EOF when this function is called.
*/
static void fts5MultiIterNext(Fts5Index *p, Fts5MultiSegIter *pIter){
static void fts5MultiIterNext(
Fts5Index *p,
Fts5MultiSegIter *pIter,
int bFrom, /* True if argument iFrom is valid */
i64 iFrom /* Advance at least as far as this */
){
if( p->rc==SQLITE_OK ){
int iFirst = pIter->aFirst[1];
fts5SegIterNext(p, &pIter->aSeg[iFirst]);
Fts5SegIter *pSeg = &pIter->aSeg[iFirst];
if( bFrom && pSeg->pDlidx ){
fts5SegIterNextFrom(p, pSeg, iFrom);
}else{
fts5SegIterNext(p, pSeg);
}
fts5MultiIterAdvanced(p, pIter, iFirst, 1);
}
}
@ -1682,7 +2054,7 @@ static void fts5MultiIterNextFrom(
){
while( 1 ){
i64 iRowid;
fts5MultiIterNext(p, pIter);
fts5MultiIterNext(p, pIter, 1, iMatch);
if( fts5MultiIterEof(p, pIter) ) break;
iRowid = fts5MultiIterRowid(pIter);
if( pIter->bRev==0 && iRowid<=iMatch ) break;
@ -2589,7 +2961,7 @@ fflush(stdout);
for(fts5MultiIterNew(p, pStruct, iIdx, 0, 0, 0, iLvl, nInput, &pIter);
fts5MultiIterEof(p, pIter)==0;
fts5MultiIterNext(p, pIter)
fts5MultiIterNext(p, pIter, 0, 0)
){
Fts5SegIter *pSeg = &pIter->aSeg[ pIter->aFirst[1] ];
Fts5ChunkIter sPos; /* Used to iterate through position list */
@ -3005,36 +3377,7 @@ static void fts5BtreeIterFree(Fts5BtreeIter *pIter){
fts5BufferFree(&pIter->term);
}
typedef struct DoclistIdxIter DoclistIdxIter;
struct DoclistIdxIter {
Fts5Data *pDlidx; /* Data for doclist index, if any */
int iOff; /* Current offset into pDlidx */
int bRowidValid; /* iRowid is valid */
int bZero; /* True if current leaf has no rowid */
i64 iRowid; /* If bZero==0, first rowid on leaf */
};
/*
** Return non-zero if EOF is reached.
*/
static int fts5IndexDoclistIterNext(DoclistIdxIter *pIter){
i64 iVal;
if( pIter->iOff>=pIter->pDlidx->n ) return 1;
pIter->iOff += getVarint(&pIter->pDlidx->p[pIter->iOff], (u64*)&iVal);
if( iVal==0 ){
pIter->bZero = 1;
}else{
pIter->bZero = 0;
if( pIter->bRowidValid ){
pIter->iRowid -= iVal;
}else{
pIter->bRowidValid = 1;
pIter->iRowid = iVal;
}
}
return 0;
}
static void fts5IndexIntegrityCheckSegment(
Fts5Index *p, /* FTS5 backend object */
@ -3052,7 +3395,6 @@ static void fts5IndexIntegrityCheckSegment(
Fts5Data *pLeaf; /* Data for this leaf */
int iOff; /* Offset of first term on leaf */
int i; /* Used to iterate through empty leaves */
DoclistIdxIter dliter; /* For iterating through any doclist index */
/* If the leaf in question has already been trimmed from the segment,
** ignore this b-tree entry. Otherwise, load it into memory. */
@ -3079,65 +3421,50 @@ static void fts5IndexIntegrityCheckSegment(
fts5DataRelease(pLeaf);
if( p->rc ) break;
memset(&dliter, 0, sizeof(DoclistIdxIter));
if( iter.bDlidx ){
i64 iDlidxRowid = FTS5_DOCLIST_IDX_ROWID(iIdx, pSeg->iSegid, iter.iLeaf);
dliter.pDlidx = fts5DataRead(p, iDlidxRowid);
}
/* Now check that the iter.nEmpty leaves following the current leaf
** (a) exist and (b) contain no terms. */
for(i=1; i<=iter.nEmpty; i++){
for(i=1; p->rc==SQLITE_OK && i<=iter.nEmpty; i++){
pLeaf = fts5DataRead(p, iRow+i);
if( pLeaf && 0!=fts5GetU16(&pLeaf->p[2]) ){
p->rc = FTS5_CORRUPT;
}
if( pLeaf && dliter.pDlidx ){
if( fts5IndexDoclistIterNext(&dliter) ){
p->rc = FTS5_CORRUPT;
}else{
fts5DataRelease(pLeaf);
}
/* If there is a doclist-index, check that it looks right. */
if( iter.bDlidx ){
Fts5DlidxIter *pDlidx = 0; /* For iterating through doclist index */
int nEntry = 0;
int iSegid = pSeg->iSegid;
int bRev = 0;
for(fts5DlidxIterInit(p, bRev, iIdx, iSegid, iter.iLeaf, &pDlidx);
fts5DlidxIterEof(p, pDlidx)==0;
fts5DlidxIterNext(pDlidx, bRev)
){
i64 iKey = FTS5_SEGMENT_ROWID(iIdx, iSegid, 0, pDlidx->iLeafPgno);
pLeaf = fts5DataRead(p, iKey);
if( pLeaf ){
int iRowidOff = fts5GetU16(&pLeaf->p[0]);
if( dliter.bZero ){
if( pDlidx->bZero ){
if( iRowidOff!=0 ) p->rc = FTS5_CORRUPT;
}else{
i64 iRowid;
getVarint(&pLeaf->p[iRowidOff], (u64*)&iRowid);
if( iRowid!=dliter.iRowid ) p->rc = FTS5_CORRUPT;
}
}
}
fts5DataRelease(pLeaf);
}
/* There may (or may not be) a final entry in the doclist. The entry
** is only present if the page following the nEmpty termless pages
** (a) exists and (b) contains at least one rowid that is part of
** the doclist. */
if( dliter.pDlidx ){
if( (iter.iLeaf + iter.nEmpty)==pSeg->pgnoLast ){
/* The next page does not exist. So the iterator should be at EOF. */
if( fts5IndexDoclistIterNext(&dliter)==0 ) p->rc = FTS5_CORRUPT;
}else{
Fts5Data *pLeaf = fts5DataRead(p, iRow+i);
if( pLeaf ){
int iRowidOff = fts5GetU16(&pLeaf->p[0]);
if( iRowidOff==0 ){
if( fts5IndexDoclistIterNext(&dliter)==0 ) p->rc = FTS5_CORRUPT;
}else{
if( fts5IndexDoclistIterNext(&dliter) ){
p->rc = FTS5_CORRUPT;
}else{
i64 iRowid;
getVarint(&pLeaf->p[iRowidOff], (u64*)&iRowid);
if( iRowid!=dliter.iRowid ) p->rc = FTS5_CORRUPT;
}
if( iRowid!=pDlidx->iRowid ) p->rc = FTS5_CORRUPT;
}
fts5DataRelease(pLeaf);
}
nEntry++;
}
}
fts5DataRelease(dliter.pDlidx);
/* Check that the doclist-index was the right length */
if( p->rc==SQLITE_OK && nEntry!=iter.nEmpty && nEntry!=iter.nEmpty+1 ){
p->rc = FTS5_CORRUPT;
}
fts5DlidxIterFree(pDlidx);
}
}
if( p->rc==SQLITE_OK && iter.iLeaf!=pSeg->pgnoLast ){
@ -3169,7 +3496,7 @@ int sqlite3Fts5IndexIntegrityCheck(Fts5Index *p, u64 cksum){
Fts5Structure *pStruct = fts5StructureRead(p, iIdx);
for(fts5MultiIterNew(p, pStruct, iIdx, 0, 0, 0, -1, 0, &pIter);
fts5MultiIterEof(p, pIter)==0;
fts5MultiIterNext(p, pIter)
fts5MultiIterNext(p, pIter, 0, 0)
){
Fts5PosIter sPos; /* Used to iterate through position list */
int n; /* Size of term in bytes */
@ -3250,29 +3577,6 @@ static void fts5DecodeStructure(
fts5StructureRelease(p);
}
/*
** Decode a segment-data rowid from the %_data table. This function is
** the opposite of macro FTS5_SEGMENT_ROWID().
*/
static void fts5DecodeRowid(
i64 iRowid, /* Rowid from %_data table */
int *piIdx, /* OUT: Index */
int *piSegid, /* OUT: Segment id */
int *piHeight, /* OUT: Height */
int *piPgno /* OUT: Page number */
){
*piPgno = (int)(iRowid & (((i64)1 << FTS5_DATA_PAGE_B) - 1));
iRowid >>= FTS5_DATA_PAGE_B;
*piHeight = (int)(iRowid & (((i64)1 << FTS5_DATA_HEIGHT_B) - 1));
iRowid >>= FTS5_DATA_HEIGHT_B;
*piSegid = (int)(iRowid & (((i64)1 << FTS5_DATA_ID_B) - 1));
iRowid >>= FTS5_DATA_ID_B;
*piIdx = (int)(iRowid & (((i64)1 << FTS5_DATA_IDX_B) - 1));
}
/*
** Buffer (a/n) is assumed to contain a list of serialized varints. Read
** each varint and append its string representation to buffer pBuf. Return
@ -3331,7 +3635,7 @@ static void fts5DecodeFunction(
sqlite3_value **apVal /* Function arguments */
){
i64 iRowid; /* Rowid for record being decoded */
int iIdx,iSegid,iHeight,iPgno; /* Rowid compenents */
int iIdx,iSegid,iHeight,iPgno; /* Rowid components */
const u8 *a; int n; /* Record to decode */
Fts5Buffer s; /* Build up text to return here */
int rc = SQLITE_OK; /* Return code */
@ -3343,12 +3647,10 @@ static void fts5DecodeFunction(
a = sqlite3_value_blob(apVal[1]);
fts5DecodeRowid(iRowid, &iIdx, &iSegid, &iHeight, &iPgno);
fts5DebugRowid(&rc, &s, iRowid);
if( iHeight==FTS5_SEGMENT_MAX_HEIGHT ){
int i = 0;
i64 iPrev;
sqlite3Fts5BufferAppendPrintf(&rc, &s, "(dlidx idx=%d segid=%d pgno=%d)",
iIdx, iSegid, iPgno
);
if( n>0 ){
i = getVarint(&a[i], (u64*)&iPrev);
sqlite3Fts5BufferAppendPrintf(&rc, &s, " %lld", iPrev);
@ -3367,20 +3669,14 @@ static void fts5DecodeFunction(
}else
if( iSegid==0 ){
if( iRowid==FTS5_AVERAGES_ROWID ){
sqlite3Fts5BufferAppendPrintf(&rc, &s, "{averages} ");
/* todo */
}else{
sqlite3Fts5BufferAppendPrintf(&rc, &s,
"{structure idx=%d}", (int)(iRowid-10)
);
fts5DecodeStructure(&rc, &s, a, n);
}
}else{
Fts5Buffer term;
memset(&term, 0, sizeof(Fts5Buffer));
sqlite3Fts5BufferAppendPrintf(&rc, &s, "(idx=%d segid=%d h=%d pgno=%d) ",
iIdx, iSegid, iHeight, iPgno
);
if( iHeight==0 ){
int iTermOff = 0;
@ -3666,7 +3962,7 @@ static void fts5SetupPrefixIter(
memset(&doclist, 0, sizeof(doclist));
for(fts5MultiIterNew(p, pStruct, 0, 1, pToken, nToken, -1, 0, &p1);
fts5MultiIterEof(p, p1)==0;
fts5MultiIterNext(p, p1)
fts5MultiIterNext(p, p1, 0, 0)
){
i64 iRowid = fts5MultiIterRowid(p1);
int nTerm;
@ -3785,7 +4081,7 @@ void sqlite3Fts5IterNext(Fts5IndexIter *pIter){
fts5DoclistIterNext(pIter->pDoclist);
}else{
fts5BufferZero(&pIter->poslist);
fts5MultiIterNext(pIter->pIndex, pIter->pMulti);
fts5MultiIterNext(pIter->pIndex, pIter->pMulti, 0, 0);
}
}