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Overview
| Comment: | Add the "instance" type to the fts5vocab virtual table module. For direct access to the contents of the fts5 term index. |
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| Downloads: | Tarball | ZIP archive | SQL archive |
| Timelines: | family | ancestors | descendants | both | trunk |
| Files: | files | file ages | folders |
| SHA3-256: |
34a7bd7121a478e14982d59be95ad891 |
| User & Date: | dan 2017-08-10 20:36:56 |
Context
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2017-08-10
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| 20:43 | Allow WITHOUT ROWID virtual tables to be writable as long as they have exactly one column as their PRIMARY KEY. check-in: c601d128 user: drh tags: trunk | |
| 20:36 | Add the "instance" type to the fts5vocab virtual table module. For direct access to the contents of the fts5 term index. check-in: 34a7bd71 user: dan tags: trunk | |
| 03:27 | Add a first draft of the "vtablog" extensions that implements a generic virtual table useful for experimentation using the command-line shell. check-in: e49279e6 user: drh tags: trunk | |
Changes
Changes to ext/fts5/fts5_vocab.c.
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** row: ** CREATE TABLE vocab(term, doc, cnt, PRIMARY KEY(term)); ** ** One row for each term in the database. The value of $doc is set to ** the number of fts5 rows that contain at least one instance of term ** $term. Field $cnt is set to the total number of instances of term ** $term in the database. */ #include "fts5Int.h" typedef struct Fts5VocabTable Fts5VocabTable; ................................................................................ struct Fts5VocabTable { sqlite3_vtab base; char *zFts5Tbl; /* Name of fts5 table */ char *zFts5Db; /* Db containing fts5 table */ sqlite3 *db; /* Database handle */ Fts5Global *pGlobal; /* FTS5 global object for this database */ int eType; /* FTS5_VOCAB_COL or ROW */ }; struct Fts5VocabCursor { sqlite3_vtab_cursor base; sqlite3_stmt *pStmt; /* Statement holding lock on pIndex */ Fts5Index *pIndex; /* Associated FTS5 index */ ................................................................................ /* These are used by 'col' tables only */ Fts5Config *pConfig; /* Fts5 table configuration */ int iCol; i64 *aCnt; i64 *aDoc; /* Output values used by 'row' and 'col' tables */ i64 rowid; /* This table's current rowid value */ Fts5Buffer term; /* Current value of 'term' column */ }; #define FTS5_VOCAB_COL 0 #define FTS5_VOCAB_ROW 1 #define FTS5_VOCAB_COL_SCHEMA "term, col, doc, cnt" #define FTS5_VOCAB_ROW_SCHEMA "term, doc, cnt" /* ** Bits for the mask used as the idxNum value by xBestIndex/xFilter. */ #define FTS5_VOCAB_TERM_EQ 0x01 #define FTS5_VOCAB_TERM_GE 0x02 #define FTS5_VOCAB_TERM_LE 0x04 ................................................................................ sqlite3Fts5Dequote(zCopy); if( sqlite3_stricmp(zCopy, "col")==0 ){ *peType = FTS5_VOCAB_COL; }else if( sqlite3_stricmp(zCopy, "row")==0 ){ *peType = FTS5_VOCAB_ROW; }else { *pzErr = sqlite3_mprintf("fts5vocab: unknown table type: %Q", zCopy); rc = SQLITE_ERROR; } sqlite3_free(zCopy); } ................................................................................ int argc, /* Number of elements in argv array */ const char * const *argv, /* xCreate/xConnect argument array */ sqlite3_vtab **ppVTab, /* Write the resulting vtab structure here */ char **pzErr /* Write any error message here */ ){ const char *azSchema[] = { "CREATE TABlE vocab(" FTS5_VOCAB_COL_SCHEMA ")", "CREATE TABlE vocab(" FTS5_VOCAB_ROW_SCHEMA ")" }; Fts5VocabTable *pRet = 0; int rc = SQLITE_OK; /* Return code */ int bDb; bDb = (argc==6 && strlen(argv[1])==4 && memcmp("temp", argv[1], 4)==0); ................................................................................ char **pzErr /* OUT: sqlite3_malloc'd error message */ ){ return fts5VocabInitVtab(db, pAux, argc, argv, ppVtab, pzErr); } /* ** Implementation of the xBestIndex method. */ static int fts5VocabBestIndexMethod( sqlite3_vtab *pUnused, sqlite3_index_info *pInfo ){ int i; int iTermEq = -1; ................................................................................ fts5VocabResetCursor(pCsr); sqlite3Fts5BufferFree(&pCsr->term); sqlite3_finalize(pCsr->pStmt); sqlite3_free(pCsr); return SQLITE_OK; } /* ** Advance the cursor to the next row in the table. */ static int fts5VocabNextMethod(sqlite3_vtab_cursor *pCursor){ Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor; Fts5VocabTable *pTab = (Fts5VocabTable*)pCursor->pVtab; int rc = SQLITE_OK; int nCol = pCsr->pConfig->nCol; pCsr->rowid++; if( pTab->eType==FTS5_VOCAB_COL ){ for(pCsr->iCol++; pCsr->iCol<nCol; pCsr->iCol++){ if( pCsr->aDoc[pCsr->iCol] ) break; } } if( pTab->eType==FTS5_VOCAB_ROW || pCsr->iCol>=nCol ){ if( sqlite3Fts5IterEof(pCsr->pIter) ){ pCsr->bEof = 1; }else{ const char *zTerm; int nTerm; zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm); ................................................................................ sqlite3Fts5BufferSet(&rc, &pCsr->term, nTerm, (const u8*)zTerm); memset(pCsr->aCnt, 0, nCol * sizeof(i64)); memset(pCsr->aDoc, 0, nCol * sizeof(i64)); pCsr->iCol = 0; assert( pTab->eType==FTS5_VOCAB_COL || pTab->eType==FTS5_VOCAB_ROW ); while( rc==SQLITE_OK ){ const u8 *pPos; int nPos; /* Position list */ i64 iPos = 0; /* 64-bit position read from poslist */ int iOff = 0; /* Current offset within position list */ pPos = pCsr->pIter->pData; nPos = pCsr->pIter->nData; switch( pCsr->pConfig->eDetail ){ case FTS5_DETAIL_FULL: pPos = pCsr->pIter->pData; nPos = pCsr->pIter->nData; if( pTab->eType==FTS5_VOCAB_ROW ){ while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){ pCsr->aCnt[0]++; } pCsr->aDoc[0]++; }else{ int iCol = -1; while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){ int ii = FTS5_POS2COLUMN(iPos); pCsr->aCnt[ii]++; if( iCol!=ii ){ if( ii>=nCol ){ rc = FTS5_CORRUPT; break; } pCsr->aDoc[ii]++; iCol = ii; } } } break; case FTS5_DETAIL_COLUMNS: if( pTab->eType==FTS5_VOCAB_ROW ){ pCsr->aDoc[0]++; }else{ while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff,&iPos) ){ assert_nc( iPos>=0 && iPos<nCol ); if( iPos>=nCol ){ rc = FTS5_CORRUPT; break; } pCsr->aDoc[iPos]++; } } break; default: assert( pCsr->pConfig->eDetail==FTS5_DETAIL_NONE ); pCsr->aDoc[0]++; break; } if( rc==SQLITE_OK ){ rc = sqlite3Fts5IterNextScan(pCsr->pIter); } if( rc==SQLITE_OK ){ zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm); if( nTerm!=pCsr->term.n || memcmp(zTerm, pCsr->term.p, nTerm) ){ break; } if( sqlite3Fts5IterEof(pCsr->pIter) ) break; ................................................................................ static int fts5VocabFilterMethod( sqlite3_vtab_cursor *pCursor, /* The cursor used for this query */ int idxNum, /* Strategy index */ const char *zUnused, /* Unused */ int nUnused, /* Number of elements in apVal */ sqlite3_value **apVal /* Arguments for the indexing scheme */ ){ Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor; int rc = SQLITE_OK; int iVal = 0; int f = FTS5INDEX_QUERY_SCAN; const char *zTerm = 0; int nTerm = 0; ................................................................................ rc = SQLITE_NOMEM; }else{ memcpy(pCsr->zLeTerm, zCopy, pCsr->nLeTerm+1); } } } if( rc==SQLITE_OK ){ rc = sqlite3Fts5IndexQuery(pCsr->pIndex, zTerm, nTerm, f, 0, &pCsr->pIter); } if( rc==SQLITE_OK ){ rc = fts5VocabNextMethod(pCursor); } return rc; } /* ................................................................................ sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC); } }else if( iCol==2 ){ iVal = pCsr->aDoc[pCsr->iCol]; }else{ iVal = pCsr->aCnt[pCsr->iCol]; } }else{ assert( iCol==1 || iCol==2 ); if( iCol==1 ){ iVal = pCsr->aDoc[0]; }else{ iVal = pCsr->aCnt[0]; } } if( iVal>0 ) sqlite3_result_int64(pCtx, iVal); return SQLITE_OK; } |
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** row: ** CREATE TABLE vocab(term, doc, cnt, PRIMARY KEY(term)); ** ** One row for each term in the database. The value of $doc is set to ** the number of fts5 rows that contain at least one instance of term ** $term. Field $cnt is set to the total number of instances of term ** $term in the database. ** ** instance: ** CREATE TABLE vocab(term, doc, col, offset, PRIMARY KEY(<all-fields>)); ** ** One row for each term instance in the database. */ #include "fts5Int.h" typedef struct Fts5VocabTable Fts5VocabTable; ................................................................................ struct Fts5VocabTable { sqlite3_vtab base; char *zFts5Tbl; /* Name of fts5 table */ char *zFts5Db; /* Db containing fts5 table */ sqlite3 *db; /* Database handle */ Fts5Global *pGlobal; /* FTS5 global object for this database */ int eType; /* FTS5_VOCAB_COL, ROW or INSTANCE */ }; struct Fts5VocabCursor { sqlite3_vtab_cursor base; sqlite3_stmt *pStmt; /* Statement holding lock on pIndex */ Fts5Index *pIndex; /* Associated FTS5 index */ ................................................................................ /* These are used by 'col' tables only */ Fts5Config *pConfig; /* Fts5 table configuration */ int iCol; i64 *aCnt; i64 *aDoc; /* Output values used by all tables. */ i64 rowid; /* This table's current rowid value */ Fts5Buffer term; /* Current value of 'term' column */ /* Output values Used by 'instance' tables only */ i64 iInstPos; int iInstOff; }; #define FTS5_VOCAB_COL 0 #define FTS5_VOCAB_ROW 1 #define FTS5_VOCAB_INSTANCE 2 #define FTS5_VOCAB_COL_SCHEMA "term, col, doc, cnt" #define FTS5_VOCAB_ROW_SCHEMA "term, doc, cnt" #define FTS5_VOCAB_INST_SCHEMA "term, doc, col, offset" /* ** Bits for the mask used as the idxNum value by xBestIndex/xFilter. */ #define FTS5_VOCAB_TERM_EQ 0x01 #define FTS5_VOCAB_TERM_GE 0x02 #define FTS5_VOCAB_TERM_LE 0x04 ................................................................................ sqlite3Fts5Dequote(zCopy); if( sqlite3_stricmp(zCopy, "col")==0 ){ *peType = FTS5_VOCAB_COL; }else if( sqlite3_stricmp(zCopy, "row")==0 ){ *peType = FTS5_VOCAB_ROW; }else if( sqlite3_stricmp(zCopy, "instance")==0 ){ *peType = FTS5_VOCAB_INSTANCE; }else { *pzErr = sqlite3_mprintf("fts5vocab: unknown table type: %Q", zCopy); rc = SQLITE_ERROR; } sqlite3_free(zCopy); } ................................................................................ int argc, /* Number of elements in argv array */ const char * const *argv, /* xCreate/xConnect argument array */ sqlite3_vtab **ppVTab, /* Write the resulting vtab structure here */ char **pzErr /* Write any error message here */ ){ const char *azSchema[] = { "CREATE TABlE vocab(" FTS5_VOCAB_COL_SCHEMA ")", "CREATE TABlE vocab(" FTS5_VOCAB_ROW_SCHEMA ")", "CREATE TABlE vocab(" FTS5_VOCAB_INST_SCHEMA ")" }; Fts5VocabTable *pRet = 0; int rc = SQLITE_OK; /* Return code */ int bDb; bDb = (argc==6 && strlen(argv[1])==4 && memcmp("temp", argv[1], 4)==0); ................................................................................ char **pzErr /* OUT: sqlite3_malloc'd error message */ ){ return fts5VocabInitVtab(db, pAux, argc, argv, ppVtab, pzErr); } /* ** Implementation of the xBestIndex method. ** ** Only constraints of the form: ** ** term <= ? ** term == ? ** term >= ? ** ** are interpreted. Less-than and less-than-or-equal are treated ** identically, as are greater-than and greater-than-or-equal. */ static int fts5VocabBestIndexMethod( sqlite3_vtab *pUnused, sqlite3_index_info *pInfo ){ int i; int iTermEq = -1; ................................................................................ fts5VocabResetCursor(pCsr); sqlite3Fts5BufferFree(&pCsr->term); sqlite3_finalize(pCsr->pStmt); sqlite3_free(pCsr); return SQLITE_OK; } static int fts5VocabInstanceNewTerm(Fts5VocabCursor *pCsr){ int rc = SQLITE_OK; if( sqlite3Fts5IterEof(pCsr->pIter) ){ pCsr->bEof = 1; }else{ const char *zTerm; int nTerm; zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm); if( pCsr->nLeTerm>=0 ){ int nCmp = MIN(nTerm, pCsr->nLeTerm); int bCmp = memcmp(pCsr->zLeTerm, zTerm, nCmp); if( bCmp<0 || (bCmp==0 && pCsr->nLeTerm<nTerm) ){ pCsr->bEof = 1; } } sqlite3Fts5BufferSet(&rc, &pCsr->term, nTerm, (const u8*)zTerm); } return rc; } static int fts5VocabInstanceNext(Fts5VocabCursor *pCsr){ int eDetail = pCsr->pConfig->eDetail; int rc = SQLITE_OK; Fts5IndexIter *pIter = pCsr->pIter; i64 *pp = &pCsr->iInstPos; int *po = &pCsr->iInstOff; while( eDetail==FTS5_DETAIL_NONE || sqlite3Fts5PoslistNext64(pIter->pData, pIter->nData, po, pp) ){ pCsr->iInstPos = 0; pCsr->iInstOff = 0; rc = sqlite3Fts5IterNextScan(pCsr->pIter); if( rc==SQLITE_OK ){ rc = fts5VocabInstanceNewTerm(pCsr); if( eDetail==FTS5_DETAIL_NONE ) break; } if( rc ){ pCsr->bEof = 1; break; } } return rc; } /* ** Advance the cursor to the next row in the table. */ static int fts5VocabNextMethod(sqlite3_vtab_cursor *pCursor){ Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor; Fts5VocabTable *pTab = (Fts5VocabTable*)pCursor->pVtab; int rc = SQLITE_OK; int nCol = pCsr->pConfig->nCol; pCsr->rowid++; if( pTab->eType==FTS5_VOCAB_INSTANCE ){ return fts5VocabInstanceNext(pCsr); } if( pTab->eType==FTS5_VOCAB_COL ){ for(pCsr->iCol++; pCsr->iCol<nCol; pCsr->iCol++){ if( pCsr->aDoc[pCsr->iCol] ) break; } } if( pTab->eType!=FTS5_VOCAB_COL || pCsr->iCol>=nCol ){ if( sqlite3Fts5IterEof(pCsr->pIter) ){ pCsr->bEof = 1; }else{ const char *zTerm; int nTerm; zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm); ................................................................................ sqlite3Fts5BufferSet(&rc, &pCsr->term, nTerm, (const u8*)zTerm); memset(pCsr->aCnt, 0, nCol * sizeof(i64)); memset(pCsr->aDoc, 0, nCol * sizeof(i64)); pCsr->iCol = 0; assert( pTab->eType==FTS5_VOCAB_COL || pTab->eType==FTS5_VOCAB_ROW ); while( rc==SQLITE_OK ){ int eDetail = pCsr->pConfig->eDetail; const u8 *pPos; int nPos; /* Position list */ i64 iPos = 0; /* 64-bit position read from poslist */ int iOff = 0; /* Current offset within position list */ pPos = pCsr->pIter->pData; nPos = pCsr->pIter->nData; switch( pTab->eType ){ case FTS5_VOCAB_ROW: if( eDetail==FTS5_DETAIL_FULL ){ while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){ pCsr->aCnt[0]++; } } pCsr->aDoc[0]++; break; case FTS5_VOCAB_COL: if( eDetail==FTS5_DETAIL_FULL ){ int iCol = -1; while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff, &iPos) ){ int ii = FTS5_POS2COLUMN(iPos); pCsr->aCnt[ii]++; if( iCol!=ii ){ if( ii>=nCol ){ rc = FTS5_CORRUPT; break; } pCsr->aDoc[ii]++; iCol = ii; } } }else if( eDetail==FTS5_DETAIL_COLUMNS ){ while( 0==sqlite3Fts5PoslistNext64(pPos, nPos, &iOff,&iPos) ){ assert_nc( iPos>=0 && iPos<nCol ); if( iPos>=nCol ){ rc = FTS5_CORRUPT; break; } pCsr->aDoc[iPos]++; } }else{ assert( eDetail==FTS5_DETAIL_NONE ); pCsr->aDoc[0]++; } break; default: assert( pTab->eType==FTS5_VOCAB_INSTANCE ); break; } if( rc==SQLITE_OK ){ rc = sqlite3Fts5IterNextScan(pCsr->pIter); } if( pTab->eType==FTS5_VOCAB_INSTANCE ) break; if( rc==SQLITE_OK ){ zTerm = sqlite3Fts5IterTerm(pCsr->pIter, &nTerm); if( nTerm!=pCsr->term.n || memcmp(zTerm, pCsr->term.p, nTerm) ){ break; } if( sqlite3Fts5IterEof(pCsr->pIter) ) break; ................................................................................ static int fts5VocabFilterMethod( sqlite3_vtab_cursor *pCursor, /* The cursor used for this query */ int idxNum, /* Strategy index */ const char *zUnused, /* Unused */ int nUnused, /* Number of elements in apVal */ sqlite3_value **apVal /* Arguments for the indexing scheme */ ){ Fts5VocabTable *pTab = (Fts5VocabTable*)pCursor->pVtab; Fts5VocabCursor *pCsr = (Fts5VocabCursor*)pCursor; int eType = pTab->eType; int rc = SQLITE_OK; int iVal = 0; int f = FTS5INDEX_QUERY_SCAN; const char *zTerm = 0; int nTerm = 0; ................................................................................ rc = SQLITE_NOMEM; }else{ memcpy(pCsr->zLeTerm, zCopy, pCsr->nLeTerm+1); } } } if( rc==SQLITE_OK ){ rc = sqlite3Fts5IndexQuery(pCsr->pIndex, zTerm, nTerm, f, 0, &pCsr->pIter); } if( rc==SQLITE_OK && eType==FTS5_VOCAB_INSTANCE ){ rc = fts5VocabInstanceNewTerm(pCsr); } if( rc==SQLITE_OK && !pCsr->bEof && (eType!=FTS5_VOCAB_INSTANCE || pCsr->pConfig->eDetail!=FTS5_DETAIL_NONE) ){ rc = fts5VocabNextMethod(pCursor); } return rc; } /* ................................................................................ sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC); } }else if( iCol==2 ){ iVal = pCsr->aDoc[pCsr->iCol]; }else{ iVal = pCsr->aCnt[pCsr->iCol]; } }else if( eType==FTS5_VOCAB_ROW ){ assert( iCol==1 || iCol==2 ); if( iCol==1 ){ iVal = pCsr->aDoc[0]; }else{ iVal = pCsr->aCnt[0]; } }else{ int eDetail = pCsr->pConfig->eDetail; assert( eType==FTS5_VOCAB_INSTANCE ); switch( iCol ){ case 1: sqlite3_result_int64(pCtx, pCsr->pIter->iRowid); break; case 2: { int ii = -1; if( eDetail==FTS5_DETAIL_FULL ){ ii = FTS5_POS2COLUMN(pCsr->iInstPos); }else if( eDetail==FTS5_DETAIL_COLUMNS ){ ii = pCsr->iInstPos; } if( ii>=0 && ii<pCsr->pConfig->nCol ){ const char *z = pCsr->pConfig->azCol[ii]; sqlite3_result_text(pCtx, z, -1, SQLITE_STATIC); } break; } default: { assert( iCol==3 ); if( eDetail==FTS5_DETAIL_FULL ){ int ii = FTS5_POS2OFFSET(pCsr->iInstPos); sqlite3_result_int(pCtx, ii); } break; } } } if( iVal>0 ) sqlite3_result_int64(pCtx, iVal); return SQLITE_OK; } |