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Overview
Comment: | Fix harmless compiler warnings in the cell-overwrite logic. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | cell-overwrite-prototype |
Files: | files | file ages | folders |
SHA3-256: |
3e11dc3183bc3e8ec49af244a8e8b3e0 |
User & Date: | drh 2018-05-07 11:29:59.385 |
Context
2018-05-07
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11:48 | On an UPDATE, try to overwrite an existing btree cell with the modified content, if the old and new cell are the same size. Use memcmp() first to avoid dirtying pages that are unchanged. (check-in: 5887d8beb5 user: drh tags: trunk) | |
11:29 | Fix harmless compiler warnings in the cell-overwrite logic. (Closed-Leaf check-in: 3e11dc3183 user: drh tags: cell-overwrite-prototype) | |
2018-05-04
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19:18 | Merge enhancements from trunk. (check-in: 9650f71b82 user: drh tags: cell-overwrite-prototype) | |
Changes
Changes to src/btree.c.
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8210 8211 8212 8213 8214 8215 8216 8217 8218 8219 8220 8221 8222 8223 8224 8225 | rc = btreeOverwriteContent(pPage, pCur->info.pPayload, pX, 0, pCur->info.nLocal); if( rc ) return rc; if( pCur->info.nLocal==nTotal ) return SQLITE_OK; /* Now overwrite the overflow pages */ iOffset = pCur->info.nLocal; ovflPgno = get4byte(pCur->info.pPayload + iOffset); pBt = pPage->pBt; ovflPageSize = pBt->usableSize - 4; do{ rc = btreeGetPage(pBt, ovflPgno, &pPage, 0); if( rc ) return rc; if( sqlite3PagerPageRefcount(pPage->pDbPage)!=1 ){ rc = SQLITE_CORRUPT_BKPT; }else{ | > > | | 8210 8211 8212 8213 8214 8215 8216 8217 8218 8219 8220 8221 8222 8223 8224 8225 8226 8227 8228 8229 8230 8231 8232 8233 8234 8235 | rc = btreeOverwriteContent(pPage, pCur->info.pPayload, pX, 0, pCur->info.nLocal); if( rc ) return rc; if( pCur->info.nLocal==nTotal ) return SQLITE_OK; /* Now overwrite the overflow pages */ iOffset = pCur->info.nLocal; assert( nTotal>=0 ); assert( iOffset>=0 ); ovflPgno = get4byte(pCur->info.pPayload + iOffset); pBt = pPage->pBt; ovflPageSize = pBt->usableSize - 4; do{ rc = btreeGetPage(pBt, ovflPgno, &pPage, 0); if( rc ) return rc; if( sqlite3PagerPageRefcount(pPage->pDbPage)!=1 ){ rc = SQLITE_CORRUPT_BKPT; }else{ if( iOffset+ovflPageSize<(u32)nTotal ){ ovflPgno = get4byte(pPage->aData); }else{ ovflPageSize = nTotal - iOffset; } rc = btreeOverwriteContent(pPage, pPage->aData+4, pX, iOffset, ovflPageSize); } |
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8334 8335 8336 8337 8338 8339 8340 | /* If the cursor is currently on the last row and we are appending a ** new row onto the end, set the "loc" to avoid an unnecessary ** btreeMoveto() call */ if( (pCur->curFlags&BTCF_ValidNKey)!=0 && pX->nKey==pCur->info.nKey ){ /* The current is currently pointing to the entry that is to be ** overwritten */ | > | > > | 8336 8337 8338 8339 8340 8341 8342 8343 8344 8345 8346 8347 8348 8349 8350 8351 8352 8353 | /* If the cursor is currently on the last row and we are appending a ** new row onto the end, set the "loc" to avoid an unnecessary ** btreeMoveto() call */ if( (pCur->curFlags&BTCF_ValidNKey)!=0 && pX->nKey==pCur->info.nKey ){ /* The current is currently pointing to the entry that is to be ** overwritten */ assert( pX->nData>=0 && pX->nZero>=0 ); if( pCur->info.nSize!=0 && pCur->info.nPayload==(u32)pX->nData+pX->nZero ){ return btreeOverwriteCell(pCur, pX); } loc = 0; }else if( loc==0 ){ rc = sqlite3BtreeMovetoUnpacked(pCur, 0, pX->nKey, flags!=0, &loc); if( rc ) return rc; } |
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