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Overview
| Comment: | Automatically resize the hash table used by fts5. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | fts5 |
| Files: | files | file ages | folders |
| SHA1: | f1cb48f412a5f200f1fe04f91072864f379db08f |
| User & Date: | dan 2014-08-12 08:36:00 |
Context
|
2014-08-12
| ||
| 16:07 | Cache the value of the "totals" record in memory during transactions. check-in: 05dfdad4 user: dan tags: fts5 | |
| 08:36 | Automatically resize the hash table used by fts5. check-in: f1cb48f4 user: dan tags: fts5 | |
|
2014-08-11
| ||
| 20:26 | Simplify the way position lists are copied when merging data. check-in: 9f8d678a user: dan tags: fts5 | |
Changes
Changes to ext/fts5/fts5_hash.c.
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 ... 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 166 167 168 169 170 171 172 173 174 175 176 177 178 179 180 181 182 183 184 185 186 187 188 ... 313 314 315 316 317 318 319 320 321 322 323 324 325 326 |
int i;
for(i=0; i<pHash->nSlot; i++){
if( pHash->aSlot[i] ){
sqlite3_free(pHash->aSlot[i]);
pHash->aSlot[i] = 0;
}
}
}
static unsigned int fts5HashKey(Fts5Hash *pHash, const char *p, int n){
int i;
unsigned int h = 13;
for(i=n-1; i>=0; i--){
h = (h << 3) ^ h ^ p[i];
}
return (h % pHash->nSlot);
}
/*
** Store the 32-bit integer passed as the second argument in buffer p.
*/
static int fts5PutNativeInt(u8 *p, int i){
assert( sizeof(i)==4 );
................................................................................
int sqlite3Fts5HashWrite(
Fts5Hash *pHash,
i64 iRowid, /* Rowid for this entry */
int iCol, /* Column token appears in (-ve -> delete) */
int iPos, /* Position of token within column */
const char *pToken, int nToken /* Token to add or remove to or from index */
){
unsigned int iHash = fts5HashKey(pHash, pToken, nToken);
Fts5HashEntry *p;
u8 *pPtr;
int nIncr = 0; /* Amount to increment (*pHash->pnByte) by */
/* Attempt to locate an existing hash object */
for(p=pHash->aSlot[iHash]; p; p=p->pNext){
if( memcmp(p->zKey, pToken, nToken)==0 && p->zKey[nToken]==0 ) break;
}
/* If an existing hash entry cannot be found, create a new one. */
if( p==0 ){
int nByte = sizeof(Fts5HashEntry) + nToken + 1 + 64;
if( nByte<128 ) nByte = 128;
p = (Fts5HashEntry*)sqlite3_malloc(nByte);
if( !p ) return SQLITE_NOMEM;
memset(p, 0, sizeof(Fts5HashEntry));
p->nAlloc = nByte;
memcpy(p->zKey, pToken, nToken);
p->zKey[nToken] = '\0';
p->iRowidOff = p->nData = nToken + 1 + sizeof(Fts5HashEntry);
p->nData += sqlite3PutVarint(&((u8*)p)[p->nData], iRowid);
p->iRowid = iRowid;
p->pNext = pHash->aSlot[iHash];
pHash->aSlot[iHash] = p;
nIncr += p->nData;
}
/* Check there is enough space to append a new entry. Worst case scenario
** is:
**
................................................................................
}
pList = 0;
for(i=0; i<nMergeSlot; i++){
pList = fts5HashEntryMerge(pList, ap[i]);
}
sqlite3_free(ap);
*ppSorted = pList;
return SQLITE_OK;
}
int sqlite3Fts5HashIterate(
Fts5Hash *pHash,
|
> | | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | > > > > > > > > |
112 113 114 115 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 140 141 142 143 144 145 146 147 148 149 150 151 152 153 154 155 156 157 158 159 160 161 162 163 164 165 ... 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213 214 215 216 217 218 219 220 221 222 223 224 225 226 ... 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 |
int i;
for(i=0; i<pHash->nSlot; i++){
if( pHash->aSlot[i] ){
sqlite3_free(pHash->aSlot[i]);
pHash->aSlot[i] = 0;
}
}
pHash->nEntry = 0;
}
static unsigned int fts5HashKey(int nSlot, const char *p, int n){
int i;
unsigned int h = 13;
for(i=n-1; i>=0; i--){
h = (h << 3) ^ h ^ p[i];
}
return (h % nSlot);
}
/*
** Resize the hash table by doubling the number of slots.
*/
static int fts5HashResize(Fts5Hash *pHash){
int nNew = pHash->nSlot*2;
int i;
Fts5HashEntry **apNew;
Fts5HashEntry **apOld = pHash->aSlot;
apNew = (Fts5HashEntry**)sqlite3_malloc(nNew*sizeof(Fts5HashEntry*));
if( !apNew ) return SQLITE_NOMEM;
memset(apNew, 0, nNew*sizeof(Fts5HashEntry*));
for(i=0; i<pHash->nSlot; i++){
while( apOld[i] ){
int iHash;
Fts5HashEntry *p = apOld[i];
apOld[i] = p->pNext;
iHash = fts5HashKey(nNew, p->zKey, strlen(p->zKey));
p->pNext = apNew[iHash];
apNew[iHash] = p;
}
}
sqlite3_free(apOld);
pHash->nSlot = nNew;
pHash->aSlot = apNew;
return SQLITE_OK;
}
/*
** Store the 32-bit integer passed as the second argument in buffer p.
*/
static int fts5PutNativeInt(u8 *p, int i){
assert( sizeof(i)==4 );
................................................................................
int sqlite3Fts5HashWrite(
Fts5Hash *pHash,
i64 iRowid, /* Rowid for this entry */
int iCol, /* Column token appears in (-ve -> delete) */
int iPos, /* Position of token within column */
const char *pToken, int nToken /* Token to add or remove to or from index */
){
unsigned int iHash = fts5HashKey(pHash->nSlot, pToken, nToken);
Fts5HashEntry *p;
u8 *pPtr;
int nIncr = 0; /* Amount to increment (*pHash->pnByte) by */
/* Attempt to locate an existing hash object */
for(p=pHash->aSlot[iHash]; p; p=p->pNext){
if( memcmp(p->zKey, pToken, nToken)==0 && p->zKey[nToken]==0 ) break;
}
/* If an existing hash entry cannot be found, create a new one. */
if( p==0 ){
int nByte = sizeof(Fts5HashEntry) + nToken + 1 + 64;
if( nByte<128 ) nByte = 128;
if( (pHash->nEntry*2)>=pHash->nSlot ){
int rc = fts5HashResize(pHash);
if( rc!=SQLITE_OK ) return rc;
iHash = fts5HashKey(pHash->nSlot, pToken, nToken);
}
p = (Fts5HashEntry*)sqlite3_malloc(nByte);
if( !p ) return SQLITE_NOMEM;
memset(p, 0, sizeof(Fts5HashEntry));
p->nAlloc = nByte;
memcpy(p->zKey, pToken, nToken);
p->zKey[nToken] = '\0';
p->iRowidOff = p->nData = nToken + 1 + sizeof(Fts5HashEntry);
p->nData += sqlite3PutVarint(&((u8*)p)[p->nData], iRowid);
p->iRowid = iRowid;
p->pNext = pHash->aSlot[iHash];
pHash->aSlot[iHash] = p;
pHash->nEntry++;
nIncr += p->nData;
}
/* Check there is enough space to append a new entry. Worst case scenario
** is:
**
................................................................................
}
pList = 0;
for(i=0; i<nMergeSlot; i++){
pList = fts5HashEntryMerge(pList, ap[i]);
}
pHash->nEntry = 0;
sqlite3_free(ap);
*ppSorted = pList;
return SQLITE_OK;
}
int sqlite3Fts5HashIterate(
Fts5Hash *pHash,
|
Changes to ext/fts5/fts5_index.c.
3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 |
}
/*
** Indicate that all subsequent calls to sqlite3Fts5IndexWrite() pertain
** to the document with rowid iRowid.
*/
void sqlite3Fts5IndexBeginWrite(Fts5Index *p, i64 iRowid){
if( iRowid<=p->iWriteRowid ){
fts5IndexFlush(p);
}
p->iWriteRowid = iRowid;
}
/*
** Commit data to disk.
|
| |
3289 3290 3291 3292 3293 3294 3295 3296 3297 3298 3299 3300 3301 3302 3303 |
}
/*
** Indicate that all subsequent calls to sqlite3Fts5IndexWrite() pertain
** to the document with rowid iRowid.
*/
void sqlite3Fts5IndexBeginWrite(Fts5Index *p, i64 iRowid){
if( iRowid<=p->iWriteRowid || (p->nPendingData > p->nMaxPendingData) ){
fts5IndexFlush(p);
}
p->iWriteRowid = iRowid;
}
/*
** Commit data to disk.
|