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Overview
| Comment: | Avoid using lookaside memory for persistent virtual table structures. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
d815f255dfbcd6d64326f7bc0ad3fe3c |
| User & Date: | drh 2017-10-02 13:20:43 |
Context
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2017-10-02
| ||
| 21:29 | Add the OK_IF_ALWAYS_TRUE() and OK_IF_ALWAYS_FALSE() macros for marking conditionals that improve performance but do not change the outcome. check-in: 6035c9b2 user: drh tags: trunk | |
| 13:20 | Avoid using lookaside memory for persistent virtual table structures. check-in: d815f255 user: drh tags: trunk | |
| 02:52 | The query planner now always prefers to implement a FROM-clause subquery using a co-routine rather than flattening the subquery into the outer query. check-in: c9104b59 user: drh tags: trunk | |
Changes
Changes to src/vtab.c.
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const char *zName, /* Name assigned to this module */
const sqlite3_module *pModule, /* The definition of the module */
void *pAux, /* Context pointer for xCreate/xConnect */
void (*xDestroy)(void *) /* Module destructor function */
){
Module *pMod;
int nName = sqlite3Strlen30(zName);
pMod = (Module *)sqlite3DbMallocRawNN(db, sizeof(Module) + nName + 1);
if( pMod ){
Module *pDel;
char *zCopy = (char *)(&pMod[1]);
memcpy(zCopy, zName, nName+1);
pMod->zName = zCopy;
pMod->pModule = pModule;
pMod->pAux = pAux;
pMod->xDestroy = xDestroy;
................................................................................
*pzErr = sqlite3MPrintf(db,
"vtable constructor called recursively: %s", pTab->zName
);
return SQLITE_LOCKED;
}
}
zModuleName = sqlite3MPrintf(db, "%s", pTab->zName);
if( !zModuleName ){
return SQLITE_NOMEM_BKPT;
}
pVTable = sqlite3DbMallocZero(db, sizeof(VTable));
if( !pVTable ){
sqlite3DbFree(db, zModuleName);
return SQLITE_NOMEM_BKPT;
}
pVTable->db = db;
pVTable->pMod = pMod;
iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
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const char *zName, /* Name assigned to this module */
const sqlite3_module *pModule, /* The definition of the module */
void *pAux, /* Context pointer for xCreate/xConnect */
void (*xDestroy)(void *) /* Module destructor function */
){
Module *pMod;
int nName = sqlite3Strlen30(zName);
pMod = (Module *)sqlite3Malloc(sizeof(Module) + nName + 1);
if( pMod==0 ){
sqlite3OomFault(db);
}else{
Module *pDel;
char *zCopy = (char *)(&pMod[1]);
memcpy(zCopy, zName, nName+1);
pMod->zName = zCopy;
pMod->pModule = pModule;
pMod->pAux = pAux;
pMod->xDestroy = xDestroy;
................................................................................
*pzErr = sqlite3MPrintf(db,
"vtable constructor called recursively: %s", pTab->zName
);
return SQLITE_LOCKED;
}
}
zModuleName = sqlite3DbStrDup(db, pTab->zName);
if( !zModuleName ){
return SQLITE_NOMEM_BKPT;
}
pVTable = sqlite3MallocZero(sizeof(VTable));
if( !pVTable ){
sqlite3OomFault(db);
sqlite3DbFree(db, zModuleName);
return SQLITE_NOMEM_BKPT;
}
pVTable->db = db;
pVTable->pMod = pMod;
iDb = sqlite3SchemaToIndex(db, pTab->pSchema);
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