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Overview
Comment: | Minor optimization for fts5 API xInst(). |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | trunk |
Files: | files | file ages | folders |
SHA1: |
efb7c9c5d0015c8c966f8d6742c05cda |
User & Date: | dan 2015-08-12 15:36:58.855 |
Context
2015-08-13
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11:46 | Avoid invoking system call unlink() directly from RBU code. Use the xDelete method of the default VFS instead. (check-in: ee966af8ff user: dan tags: trunk) | |
2015-08-12
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19:42 | Avoid reading frames that have already been checkpointed from the wal file. (check-in: 5669ac4a40 user: dan tags: wal-read-change) | |
15:36 | Minor optimization for fts5 API xInst(). (check-in: efb7c9c5d0 user: dan tags: trunk) | |
12:11 | Add the xPhraseFirst() and xPhraseNext() fts5 APIs, for faster iteration through a single phrases position list. Also optimize xInst() and xInstCount() a bit. (check-in: f768243527 user: dan tags: trunk) | |
Changes
Changes to ext/fts5/fts5_main.c.
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1531 1532 1533 1534 1535 1536 1537 | /* ** Ensure that the Fts5Cursor.nInstCount and aInst[] variables are populated ** correctly for the current view. Return SQLITE_OK if successful, or an ** SQLite error code otherwise. */ static int fts5CacheInstArray(Fts5Cursor *pCsr){ int rc = SQLITE_OK; | < | 1531 1532 1533 1534 1535 1536 1537 1538 1539 1540 1541 1542 1543 1544 | /* ** Ensure that the Fts5Cursor.nInstCount and aInst[] variables are populated ** correctly for the current view. Return SQLITE_OK if successful, or an ** SQLite error code otherwise. */ static int fts5CacheInstArray(Fts5Cursor *pCsr){ int rc = SQLITE_OK; Fts5PoslistReader *aIter; /* One iterator for each phrase */ int nIter; /* Number of iterators/phrases */ nIter = sqlite3Fts5ExprPhraseCount(pCsr->pExpr); if( pCsr->aInstIter==0 ){ int nByte = sizeof(Fts5PoslistReader) * nIter; pCsr->aInstIter = (Fts5PoslistReader*)sqlite3Fts5MallocZero(&rc, nByte); |
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1589 1590 1591 1592 1593 1594 1595 | aInst[2] = FTS5_POS2OFFSET(aIter[iBest].iPos); sqlite3Fts5PoslistReaderNext(&aIter[iBest]); } pCsr->nInstCount = nInst; CsrFlagClear(pCsr, FTS5CSR_REQUIRE_INST); } | < | > | | > | > | 1588 1589 1590 1591 1592 1593 1594 1595 1596 1597 1598 1599 1600 1601 1602 1603 1604 1605 1606 1607 1608 1609 1610 1611 1612 1613 1614 1615 1616 1617 1618 1619 1620 1621 1622 1623 1624 1625 1626 | aInst[2] = FTS5_POS2OFFSET(aIter[iBest].iPos); sqlite3Fts5PoslistReaderNext(&aIter[iBest]); } pCsr->nInstCount = nInst; CsrFlagClear(pCsr, FTS5CSR_REQUIRE_INST); } return rc; } static int fts5ApiInstCount(Fts5Context *pCtx, int *pnInst){ Fts5Cursor *pCsr = (Fts5Cursor*)pCtx; int rc = SQLITE_OK; if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0 || SQLITE_OK==(rc = fts5CacheInstArray(pCsr)) ){ *pnInst = pCsr->nInstCount; } return rc; } static int fts5ApiInst( Fts5Context *pCtx, int iIdx, int *piPhrase, int *piCol, int *piOff ){ Fts5Cursor *pCsr = (Fts5Cursor*)pCtx; int rc = SQLITE_OK; if( CsrFlagTest(pCsr, FTS5CSR_REQUIRE_INST)==0 || SQLITE_OK==(rc = fts5CacheInstArray(pCsr)) ){ if( iIdx<0 || iIdx>=pCsr->nInstCount ){ rc = SQLITE_RANGE; }else{ *piPhrase = pCsr->aInst[iIdx*3]; *piCol = pCsr->aInst[iIdx*3 + 1]; *piOff = pCsr->aInst[iIdx*3 + 2]; } |
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