Many hyperlinks are disabled.
Use anonymous login
to enable hyperlinks.
Overview
Comment: | Fix a bug in calculating the average number of entries for keys not present in the sqlite_stat4 table. |
---|---|
Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | sqlite_stat4 |
Files: | files | file ages | folders |
SHA1: |
ec3ffb174844406a6186c3dcc41b76d0 |
User & Date: | dan 2013-08-12 11:21:10.969 |
Context
2013-08-12
| ||
16:34 | Re-enable reading from the sqlite_stat3 table (as well as sqlite_stat4). (check-in: 6d45078e62 user: dan tags: sqlite_stat4) | |
11:21 | Fix a bug in calculating the average number of entries for keys not present in the sqlite_stat4 table. (check-in: ec3ffb1748 user: dan tags: sqlite_stat4) | |
09:29 | Fix minor problems caused by adding the rowid to the records in stat4. (check-in: 088d1ff948 user: dan tags: sqlite_stat4) | |
Changes
Changes to src/analyze.c.
︙ | ︙ | |||
1278 1279 1280 1281 1282 1283 1284 | sqlite3DbFree(db, zSql); if( rc ) return rc; while( sqlite3_step(pStmt)==SQLITE_ROW ){ char *zIndex; /* Index name */ Index *pIdx; /* Pointer to the index object */ int i; /* Loop counter */ | < | 1278 1279 1280 1281 1282 1283 1284 1285 1286 1287 1288 1289 1290 1291 | sqlite3DbFree(db, zSql); if( rc ) return rc; while( sqlite3_step(pStmt)==SQLITE_ROW ){ char *zIndex; /* Index name */ Index *pIdx; /* Pointer to the index object */ int i; /* Loop counter */ int nCol; /* Number of columns in index */ zIndex = (char *)sqlite3_column_text(pStmt, 0); if( zIndex==0 ) continue; pIdx = sqlite3FindIndex(db, zIndex, zDb); if( pIdx==0 ) continue; if( pIdx==pPrevIdx ){ |
︙ | ︙ | |||
1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 | nCol = pIdx->nColumn+1; decodeIntArray((char*)sqlite3_column_text(pStmt,1), nCol, pSample->anEq, 0); decodeIntArray((char*)sqlite3_column_text(pStmt,2), nCol, pSample->anLt, 0); decodeIntArray((char*)sqlite3_column_text(pStmt,3), nCol, pSample->anDLt,0); if( idx==pIdx->nSample-1 ){ int iCol; for(iCol=0; iCol<pIdx->nColumn; iCol++){ tRowcnt avgEq = 0; tRowcnt nDLt = pSample->anDLt[iCol]; | > > > > > > > > > > > > > > > | < | | 1299 1300 1301 1302 1303 1304 1305 1306 1307 1308 1309 1310 1311 1312 1313 1314 1315 1316 1317 1318 1319 1320 1321 1322 1323 1324 1325 1326 1327 1328 1329 1330 1331 1332 1333 | nCol = pIdx->nColumn+1; decodeIntArray((char*)sqlite3_column_text(pStmt,1), nCol, pSample->anEq, 0); decodeIntArray((char*)sqlite3_column_text(pStmt,2), nCol, pSample->anLt, 0); decodeIntArray((char*)sqlite3_column_text(pStmt,3), nCol, pSample->anDLt,0); if( idx==pIdx->nSample-1 ){ IndexSample *aSample = pIdx->aSample; int iCol; for(iCol=0; iCol<pIdx->nColumn; iCol++){ tRowcnt sumEq = 0; /* Sum of the nEq values */ int nSum = 0; /* Number of terms contributing to sumEq */ tRowcnt avgEq = 0; tRowcnt nDLt = pSample->anDLt[iCol]; /* Set nSum to the number of distinct (iCol+1) field prefixes that ** occur in the stat4 table for this index before pSample. Set ** sumEq to the sum of the nEq values for column iCol for the same ** set (adding the value only once where there exist dupicate ** prefixes). */ for(i=0; i<(pIdx->nSample-1); i++){ if( aSample[i].anDLt[iCol]!=aSample[i+1].anDLt[iCol] ){ sumEq += aSample[i].anEq[iCol]; nSum++; } } if( nDLt>nSum ){ avgEq = (pSample->anLt[iCol] - sumEq)/(nDLt - nSum); } if( avgEq==0 ) avgEq = 1; pIdx->aAvgEq[iCol] = avgEq; } } pSample->n = sqlite3_column_bytes(pStmt, 4); |
︙ | ︙ |