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Overview
| Comment: | Speed this branch up a bit by filtering before the virtual table layer when sampling user data. |
|---|---|
| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | schemalint-failure |
| Files: | files | file ages | folders |
| SHA3-256: |
8e57c31340dd9ffc457da63c5996fb1b |
| User & Date: | dan 2017-04-20 16:43:32 |
Context
|
2017-04-20
| ||
| 17:03 | Avoid creating a temp table in the user database in the sqlite3_expert code. check-in: 4e366996 user: dan tags: schemalint | |
| 16:43 | Speed this branch up a bit by filtering before the virtual table layer when sampling user data. Closed-Leaf check-in: 8e57c313 user: dan tags: schemalint-failure | |
| 16:08 | Avoid creating a temp table in the user database in the sqlite3_expert code. Trouble is, this makes sampling for stat1 data much slower. check-in: c62e3582 user: dan tags: schemalint-failure | |
Changes
Changes to ext/expert/sqlite3expert.c.
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sqlite3expert *pExpert;
};
typedef struct ExpertCsr ExpertCsr;
struct ExpertCsr {
sqlite3_vtab_cursor base;
sqlite3_stmt *pData;
int iTarget; /* Target as a percentage */
double target; /* Target nRet/nRow value */
double nRow; /* Rows seen */
double nRet; /* Rows returned */
};
static char *expertDequote(const char *zIn){
int n = strlen(zIn);
char *zRet = sqlite3_malloc(n);
assert( zIn[0]=='\'' );
................................................................................
/*
** Virtual table module xNext method.
*/
static int expertNext(sqlite3_vtab_cursor *cur){
ExpertCsr *pCsr = (ExpertCsr*)cur;
int rc = SQLITE_OK;
int bRet;
assert( pCsr->pData );
do {
rc = sqlite3_step(pCsr->pData);
if( rc!=SQLITE_ROW ){
rc = sqlite3_finalize(pCsr->pData);
pCsr->pData = 0;
bRet = 1;
}else{
rc = SQLITE_OK;
bRet = (pCsr->nRow==0.0 || pCsr->nRow/pCsr->nRet < pCsr->target);
if( bRet==0 ){
unsigned short rnd;
sqlite3_randomness(2, (void*)&rnd);
bRet = ((int)rnd % 100) <= pCsr->iTarget;
}
}
pCsr->nRow += 1.0;
}while( bRet==0 );
pCsr->nRet += 1.0;
return rc;
}
/*
** Virtual table module xRowid method.
*/
static int expertRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
................................................................................
ExpertCsr *pCsr = (ExpertCsr*)cur;
ExpertVtab *pVtab = (ExpertVtab*)(cur->pVtab);
sqlite3expert *pExpert = pVtab->pExpert;
int rc;
rc = sqlite3_finalize(pCsr->pData);
pCsr->pData = 0;
pCsr->nRow = 0.0;
pCsr->nRet = 0.0;
pCsr->iTarget = pExpert->iSample;
pCsr->target = (double)pExpert->iSample / 100.0;
if( rc==SQLITE_OK ){
rc = idxPrintfPrepareStmt(pExpert->db, &pCsr->pData, &pVtab->base.zErrMsg,
"SELECT * FROM main.%Q", pVtab->pTab->zName
);
}
if( rc==SQLITE_OK ){
rc = expertNext(cur);
}
return rc;
................................................................................
samplectx.nRet = 0.0;
rc = idxBuildSampleTable(p, zTab);
if( rc!=SQLITE_OK ) break;
}
rc = idxPopulateOneStat1(p, pIndexXInfo, pWrite, zTab, zIdx, pzErr);
iPrev = iRowid;
}
if( p->iSample<100 ){
rc = sqlite3_exec(p->db, "DROP TABLE IF EXISTS temp." UNIQUE_TABLE_NAME,
0,0,0
);
}
idxFinalize(&rc, pAllIndex);
idxFinalize(&rc, pIndexXInfo);
idxFinalize(&rc, pWrite);
|
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sqlite3expert *pExpert;
};
typedef struct ExpertCsr ExpertCsr;
struct ExpertCsr {
sqlite3_vtab_cursor base;
sqlite3_stmt *pData;
};
static char *expertDequote(const char *zIn){
int n = strlen(zIn);
char *zRet = sqlite3_malloc(n);
assert( zIn[0]=='\'' );
................................................................................
/*
** Virtual table module xNext method.
*/
static int expertNext(sqlite3_vtab_cursor *cur){
ExpertCsr *pCsr = (ExpertCsr*)cur;
int rc = SQLITE_OK;
assert( pCsr->pData );
rc = sqlite3_step(pCsr->pData);
if( rc!=SQLITE_ROW ){
rc = sqlite3_finalize(pCsr->pData);
pCsr->pData = 0;
}else{
rc = SQLITE_OK;
}
return rc;
}
/*
** Virtual table module xRowid method.
*/
static int expertRowid(sqlite3_vtab_cursor *cur, sqlite_int64 *pRowid){
................................................................................
ExpertCsr *pCsr = (ExpertCsr*)cur;
ExpertVtab *pVtab = (ExpertVtab*)(cur->pVtab);
sqlite3expert *pExpert = pVtab->pExpert;
int rc;
rc = sqlite3_finalize(pCsr->pData);
pCsr->pData = 0;
if( rc==SQLITE_OK ){
rc = idxPrintfPrepareStmt(pExpert->db, &pCsr->pData, &pVtab->base.zErrMsg,
"SELECT * FROM main.%Q WHERE sample()", pVtab->pTab->zName
);
}
if( rc==SQLITE_OK ){
rc = expertNext(cur);
}
return rc;
................................................................................
samplectx.nRet = 0.0;
rc = idxBuildSampleTable(p, zTab);
if( rc!=SQLITE_OK ) break;
}
rc = idxPopulateOneStat1(p, pIndexXInfo, pWrite, zTab, zIdx, pzErr);
iPrev = iRowid;
}
if( rc==SQLITE_OK && p->iSample<100 ){
rc = sqlite3_exec(p->dbv,
"DROP TABLE IF EXISTS temp." UNIQUE_TABLE_NAME, 0,0,0
);
}
idxFinalize(&rc, pAllIndex);
idxFinalize(&rc, pIndexXInfo);
idxFinalize(&rc, pWrite);
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