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Overview
Comment: | Progress towards integrating schemalint into the shell tool. Some cases work now. |
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Downloads: | Tarball | ZIP archive |
Timelines: | family | ancestors | descendants | both | schemalint |
Files: | files | file ages | folders |
SHA1: |
58d4cf26e15f90463148bec63d6ab514 |
User & Date: | dan 2016-02-15 20:12:16.368 |
Context
2016-02-16
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18:37 | Fix further issues in schemalint. (check-in: 73a7f01093 user: dan tags: schemalint) | |
2016-02-15
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20:12 | Progress towards integrating schemalint into the shell tool. Some cases work now. (check-in: 58d4cf26e1 user: dan tags: schemalint) | |
2016-02-11
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21:01 | Experimental integration of schemalint functionality with the shell tool. Does not work yet. (check-in: ed49f297bc user: dan tags: schemalint) | |
Changes
Changes to src/shell_indexes.c.
︙ | ︙ | |||
14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 | typedef sqlite3_int64 i64; typedef struct IdxConstraint IdxConstraint; typedef struct IdxContext IdxContext; typedef struct IdxScan IdxScan; typedef struct IdxWhere IdxWhere; /* ** A single constraint. Equivalent to either "col = ?" or "col < ?". ** ** pLink: ** ... todo ... */ struct IdxConstraint { char *zColl; /* Collation sequence */ int bRange; /* True for range, false for eq */ int iCol; /* Constrained table column */ i64 depmask; /* Dependency mask */ IdxConstraint *pNext; /* Next constraint in pEq or pRange list */ IdxConstraint *pLink; /* See above */ }; /* | > > > | > > > > > | | > > > > > > | > > > > > > > > > > > > | 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51 52 53 54 55 56 57 58 59 60 61 62 63 64 65 66 67 68 69 70 71 72 73 74 75 76 77 78 79 80 81 82 83 84 85 86 87 88 89 90 91 92 93 94 95 96 97 98 99 100 101 102 103 | typedef sqlite3_int64 i64; typedef struct IdxConstraint IdxConstraint; typedef struct IdxContext IdxContext; typedef struct IdxScan IdxScan; typedef struct IdxWhere IdxWhere; typedef struct IdxColumn IdxColumn; typedef struct IdxTable IdxTable; /* ** A single constraint. Equivalent to either "col = ?" or "col < ?". ** ** pLink: ** ... todo ... */ struct IdxConstraint { char *zColl; /* Collation sequence */ int bRange; /* True for range, false for eq */ int iCol; /* Constrained table column */ i64 depmask; /* Dependency mask */ IdxConstraint *pNext; /* Next constraint in pEq or pRange list */ IdxConstraint *pLink; /* See above */ }; /* ** A WHERE clause. Made up of IdxConstraint objects. Example WHERE clause: ** ** a=? AND b=? AND (c=? OR d=?) AND (e=? OR f=?) ** ** The above ** ** ** */ struct IdxWhere { IdxConstraint *pEq; /* List of == constraints */ IdxConstraint *pRange; /* List of < constraints */ IdxWhere *pOr; /* List of OR constraints */ IdxWhere *pNextOr; /* Next in OR constraints of same IdxWhere */ IdxWhere *pSibling; /* Next branch in single OR constraint */ IdxWhere *pParent; /* Parent object (or NULL) */ }; /* ** A single scan of a single table. */ struct IdxScan { IdxTable *pTable; /* Table-info */ char *zTable; /* Name of table to scan */ int iDb; /* Database containing table zTable */ i64 covering; /* Mask of columns required for cov. index */ IdxConstraint *pOrder; /* ORDER BY columns */ IdxWhere where; /* WHERE Constraints */ IdxScan *pNextScan; /* Next IdxScan object for same query */ }; /* ** Context object passed to idxWhereInfo() */ struct IdxContext { IdxWhere *pCurrent; /* Current where clause */ int rc; /* Error code (if error has occurred) */ IdxScan *pScan; /* List of scan objects */ sqlite3 *dbm; /* In-memory db for this analysis */ sqlite3 *db; /* User database under analysis */ sqlite3_stmt *pInsertMask; /* To write to aux.depmask */ }; /* ** Data regarding a database table. Extracted from "PRAGMA table_info" */ struct IdxColumn { char *zName; char *zColl; int iPk; }; struct IdxTable { int nCol; IdxColumn *aCol; }; typedef struct PragmaTable PragmaTable; typedef struct PragmaCursor PragmaCursor; struct PragmaTable { sqlite3_vtab base; sqlite3 *db; |
︙ | ︙ | |||
90 91 92 93 94 95 96 | sqlite3 *db, void *pAux, int argc, const char *const*argv, sqlite3_vtab **ppVtab, char **pzErr ){ const char *zSchema = | | > > | 116 117 118 119 120 121 122 123 124 125 126 127 128 129 130 131 132 133 134 135 136 137 138 139 | sqlite3 *db, void *pAux, int argc, const char *const*argv, sqlite3_vtab **ppVtab, char **pzErr ){ const char *zSchema = "CREATE TABLE a(tbl HIDDEN, cid, name, type, isnotnull, dflt_value, pk)"; PragmaTable *pTab = 0; int rc = SQLITE_OK; rc = sqlite3_declare_vtab(db, zSchema); if( rc==SQLITE_OK ){ pTab = (PragmaTable *)sqlite3_malloc64(sizeof(PragmaTable)); if( pTab==0 ) rc = SQLITE_NOMEM; }else{ *pzErr = sqlite3_mprintf("%s", sqlite3_errmsg(db)); } assert( rc==SQLITE_OK || pTab==0 ); if( rc==SQLITE_OK ){ memset(pTab, 0, sizeof(PragmaTable)); pTab->db = db; } |
︙ | ︙ | |||
148 149 150 151 152 153 154 | return SQLITE_OK; } /* ** Open a new pragma cursor. */ static int pragmaOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){ | < > > > > > > > | 176 177 178 179 180 181 182 183 184 185 186 187 188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 | return SQLITE_OK; } /* ** Open a new pragma cursor. */ static int pragmaOpen(sqlite3_vtab *pVTab, sqlite3_vtab_cursor **ppCursor){ PragmaCursor *pCsr; pCsr = (PragmaCursor*)sqlite3_malloc64(sizeof(PragmaCursor)); if( pCsr==0 ){ return SQLITE_NOMEM; }else{ memset(pCsr, 0, sizeof(PragmaCursor)); pCsr->base.pVtab = pVTab; } *ppCursor = (sqlite3_vtab_cursor*)pCsr; return SQLITE_OK; } static int pragmaClose(sqlite3_vtab_cursor *pCursor){ PragmaCursor *pCsr = (PragmaCursor*)pCursor; sqlite3_finalize(pCsr->pStmt); sqlite3_free(pCsr); return SQLITE_OK; } /* ** Move a statvfs cursor to the next entry in the file. */ static int pragmaNext(sqlite3_vtab_cursor *pCursor){ PragmaCursor *pCsr = (PragmaCursor*)pCursor; int rc = SQLITE_OK; |
︙ | ︙ | |||
208 209 210 211 212 213 214 215 216 217 218 219 220 221 | zTbl = (const char*)sqlite3_value_text(argv[0]); zSql = sqlite3_mprintf("PRAGMA table_info(%Q)", zTbl); if( zSql==0 ){ rc = SQLITE_NOMEM; }else{ rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pCsr->pStmt, 0); } return pragmaNext(pCursor);; } /* ** xColumn method. */ static int pragmaColumn( | > | 242 243 244 245 246 247 248 249 250 251 252 253 254 255 256 | zTbl = (const char*)sqlite3_value_text(argv[0]); zSql = sqlite3_mprintf("PRAGMA table_info(%Q)", zTbl); if( zSql==0 ){ rc = SQLITE_NOMEM; }else{ rc = sqlite3_prepare_v2(pTab->db, zSql, -1, &pCsr->pStmt, 0); } if( rc ) return rc; return pragmaNext(pCursor);; } /* ** xColumn method. */ static int pragmaColumn( |
︙ | ︙ | |||
304 305 306 307 308 309 310 | int eOp, const char *zVal, int iVal, i64 mask ){ IdxContext *p = (IdxContext*)pCtx; | | | 339 340 341 342 343 344 345 346 347 348 349 350 351 352 353 | int eOp, const char *zVal, int iVal, i64 mask ){ IdxContext *p = (IdxContext*)pCtx; #if 0 const char *zOp = eOp==SQLITE_WHEREINFO_TABLE ? "TABLE" : eOp==SQLITE_WHEREINFO_EQUALS ? "EQUALS" : eOp==SQLITE_WHEREINFO_RANGE ? "RANGE" : eOp==SQLITE_WHEREINFO_ORDERBY ? "ORDERBY" : eOp==SQLITE_WHEREINFO_NEXTOR ? "NEXTOR" : eOp==SQLITE_WHEREINFO_ENDOR ? "ENDOR" : |
︙ | ︙ | |||
357 358 359 360 361 362 363 364 365 366 367 | if( eOp==SQLITE_WHEREINFO_RANGE ){ pNew->pNext = p->pCurrent->pRange; p->pCurrent->pRange = pNew; }else{ pNew->pNext = p->pCurrent->pEq; p->pCurrent->pEq = pNew; } break; } case SQLITE_WHEREINFO_BEGINOR: { | > > > > > | > > > > > | > > > | > > > | | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | > > > > > > | | | > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > > | > > > > > > | 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414 415 416 417 418 419 420 421 422 423 424 425 426 427 428 429 430 431 432 433 434 435 436 437 438 439 440 441 442 443 444 445 446 447 448 449 450 451 452 453 454 455 456 457 458 459 460 461 462 463 464 465 466 467 468 469 470 471 472 473 474 475 476 477 478 479 480 481 482 483 484 485 486 487 488 489 490 491 492 493 494 495 496 497 498 499 500 501 502 503 504 505 506 507 508 509 510 511 512 513 514 515 516 517 518 519 520 521 522 523 524 525 526 527 528 529 530 531 532 533 534 535 536 537 538 539 540 541 542 543 544 545 546 547 548 549 550 551 552 553 554 555 556 557 558 559 560 561 562 563 564 565 566 567 568 569 570 571 572 573 574 575 576 577 578 579 580 581 582 583 584 585 586 587 588 589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616 617 618 619 620 621 622 623 624 625 626 627 628 629 630 631 632 633 634 635 636 637 638 639 640 641 642 643 644 645 646 647 648 649 650 651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668 669 670 671 672 673 674 675 676 677 678 679 680 681 682 683 684 685 686 687 688 689 690 691 692 693 694 695 696 697 698 699 700 701 702 703 704 705 706 707 708 709 710 711 712 713 714 715 716 717 718 719 720 721 722 723 724 725 726 727 728 729 730 731 732 733 734 735 736 737 738 739 740 741 742 743 744 745 746 747 748 749 750 751 752 753 754 755 756 757 758 759 760 761 762 763 764 765 766 767 768 769 770 771 772 773 774 775 776 777 778 779 780 781 782 783 784 785 786 787 788 789 790 791 792 793 794 795 796 797 798 799 800 801 802 803 804 805 806 807 808 809 810 811 812 813 814 815 816 817 818 819 820 821 822 823 824 825 826 827 828 829 830 831 832 833 834 835 836 837 838 839 840 841 842 843 844 845 846 847 848 849 850 851 852 853 854 855 856 857 858 859 860 861 862 863 864 865 866 867 868 869 870 871 872 873 874 875 876 877 878 879 880 881 882 883 884 885 886 887 888 889 890 891 892 893 894 895 896 897 898 899 900 901 902 903 904 905 906 907 908 909 910 911 912 913 914 915 916 917 918 919 920 921 922 923 924 925 926 927 928 929 930 931 932 933 934 935 936 937 938 939 940 941 | if( eOp==SQLITE_WHEREINFO_RANGE ){ pNew->pNext = p->pCurrent->pRange; p->pCurrent->pRange = pNew; }else{ pNew->pNext = p->pCurrent->pEq; p->pCurrent->pEq = pNew; } sqlite3_bind_int64(p->pInsertMask, 1, mask); sqlite3_step(p->pInsertMask); p->rc = sqlite3_reset(p->pInsertMask); break; } case SQLITE_WHEREINFO_BEGINOR: { IdxWhere *pNew = (IdxWhere*)idxMalloc(&p->rc, sizeof(IdxWhere)); if( pNew==0 ) return; pNew->pParent = p->pCurrent; pNew->pNextOr = p->pCurrent->pOr; p->pCurrent->pOr = pNew; p->pCurrent = pNew; break; } case SQLITE_WHEREINFO_NEXTOR: { IdxWhere *pNew = (IdxWhere*)idxMalloc(&p->rc, sizeof(IdxWhere)); if( pNew==0 ) return; pNew->pParent = p->pCurrent->pParent; assert( p->pCurrent->pSibling==0 ); p->pCurrent->pSibling = pNew; p->pCurrent = pNew; break; } case SQLITE_WHEREINFO_ENDOR: { assert( p->pCurrent->pParent ); p->pCurrent = p->pCurrent->pParent; break; } } } } /* ** An error associated with database handle db has just occurred. Pass ** the error message to callback function xOut. */ static void idxDatabaseError( sqlite3 *db, /* Database handle */ char **pzErrmsg /* Write error here */ ){ *pzErrmsg = sqlite3_mprintf("%s", sqlite3_errmsg(db)); } static char *idxQueryToList( sqlite3 *db, const char *zBind, int *pRc, char **pzErrmsg, const char *zSql ){ char *zRet = 0; if( *pRc==SQLITE_OK ){ sqlite3_stmt *pStmt = 0; int rc = sqlite3_prepare_v2(db, zSql, -1, &pStmt, 0); if( rc==SQLITE_OK ){ sqlite3_bind_text(pStmt, 1, zBind, -1, SQLITE_TRANSIENT); while( rc==SQLITE_OK && sqlite3_step(pStmt)==SQLITE_ROW ){ const char *z = (const char*)sqlite3_column_text(pStmt, 0); zRet = sqlite3_mprintf("%z%s%Q", zRet, zRet?", ":"", z); if( zRet==0 ){ rc = SQLITE_NOMEM; } } rc = sqlite3_finalize(pStmt); } if( rc ){ idxDatabaseError(db, pzErrmsg); sqlite3_free(zRet); zRet = 0; } *pRc = rc; } return zRet; } static int idxGetTableInfo( sqlite3 *db, IdxScan *pScan, char **pzErrmsg ){ const char *zSql = "SELECT name, pk FROM pragma_table_info(?)"; sqlite3_stmt *p1 = 0; int nCol = 0; int nByte = sizeof(IdxTable); IdxTable *pNew = 0; int rc, rc2; char *pCsr; rc = sqlite3_prepare_v2(db, zSql, -1, &p1, 0); if( rc!=SQLITE_OK ){ idxDatabaseError(db, pzErrmsg); return rc; } sqlite3_bind_text(p1, 1, pScan->zTable, -1, SQLITE_TRANSIENT); while( SQLITE_ROW==sqlite3_step(p1) ){ const char *zCol = sqlite3_column_text(p1, 0); nByte += 1 + strlen(zCol); rc = sqlite3_table_column_metadata( db, "main", pScan->zTable, zCol, 0, &zCol, 0, 0, 0 ); nByte += 1 + strlen(zCol); nCol++; } rc2 = sqlite3_reset(p1); if( rc==SQLITE_OK ) rc = rc2; nByte += sizeof(IdxColumn) * nCol; if( rc==SQLITE_OK ){ pNew = idxMalloc(&rc, nByte); } if( rc==SQLITE_OK ){ pNew->aCol = (IdxColumn*)&pNew[1]; pNew->nCol = nCol; pCsr = (char*)&pNew->aCol[nCol]; } nCol = 0; while( rc==SQLITE_OK && SQLITE_ROW==sqlite3_step(p1) ){ const char *zCol = sqlite3_column_text(p1, 0); int nCopy = strlen(zCol) + 1; pNew->aCol[nCol].zName = pCsr; pNew->aCol[nCol].iPk = sqlite3_column_int(p1, 1); memcpy(pCsr, zCol, nCopy); pCsr += nCopy; rc = sqlite3_table_column_metadata( db, "main", pScan->zTable, zCol, 0, &zCol, 0, 0, 0 ); if( rc==SQLITE_OK ){ nCopy = strlen(zCol) + 1; pNew->aCol[nCol].zColl = pCsr; memcpy(pCsr, zCol, nCopy); pCsr += nCopy; } nCol++; } rc2 = sqlite3_finalize(p1); if( rc==SQLITE_OK ) rc = rc2; if( rc==SQLITE_OK ){ pScan->pTable = pNew; }else{ sqlite3_free(pNew); } return rc; } static int idxCreateTables( sqlite3 *db, /* User database */ sqlite3 *dbm, /* In-memory database to create tables in */ IdxScan *pScan, /* List of scans */ char **pzErrmsg /* OUT: Error message */ ){ int rc = SQLITE_OK; IdxScan *pIter; for(pIter=pScan; pIter && rc==SQLITE_OK; pIter=pIter->pNextScan){ int nPk = 0; char *zCols = 0; char *zPk = 0; char *zCreate = 0; int iCol; rc = idxGetTableInfo(db, pIter, pzErrmsg); for(iCol=0; rc==SQLITE_OK && iCol<pIter->pTable->nCol; iCol++){ IdxColumn *pCol = &pIter->pTable->aCol[iCol]; if( pCol->iPk>nPk ) nPk = pCol->iPk; zCols = sqlite3_mprintf("%z%s%Q", zCols, (zCols?", ":""), pCol->zName); if( zCols==0 ) rc = SQLITE_NOMEM; } for(iCol=1; rc==SQLITE_OK && iCol<=nPk; iCol++){ int j; for(j=0; j<pIter->pTable->nCol; j++){ IdxColumn *pCol = &pIter->pTable->aCol[j]; if( pCol->iPk==iCol ){ zPk = sqlite3_mprintf("%z%s%Q", zPk, (zPk?", ":""), pCol->zName); if( zPk==0 ) rc = SQLITE_NOMEM; break; } } } if( rc==SQLITE_OK ){ if( zPk ){ zCreate = sqlite3_mprintf("CREATE TABLE %Q(%s, PRIMARY KEY(%s))", pIter->zTable, zCols, zPk ); }else{ zCreate = sqlite3_mprintf("CREATE TABLE %Q(%s)", pIter->zTable, zCols); } if( zCreate==0 ) rc = SQLITE_NOMEM; } if( rc==SQLITE_OK ){ #if 1 printf("/* %s */\n", zCreate); #endif rc = sqlite3_exec(dbm, zCreate, 0, 0, pzErrmsg); } sqlite3_free(zCols); sqlite3_free(zPk); sqlite3_free(zCreate); } return rc; } /* ** This function is a no-op if *pRc is set to anything other than ** SQLITE_OK when it is called. ** ** If *pRc is initially set to SQLITE_OK, then the text specified by ** the printf() style arguments is appended to zIn and the result returned ** in a buffer allocated by sqlite3_malloc(). sqlite3_free() is called on ** zIn before returning. */ static char *idxAppendText(int *pRc, char *zIn, const char *zFmt, ...){ va_list ap; char *zAppend = 0; char *zRet = 0; int nIn = zIn ? strlen(zIn) : 0; int nAppend = 0; va_start(ap, zFmt); if( *pRc==SQLITE_OK ){ zAppend = sqlite3_vmprintf(zFmt, ap); if( zAppend ){ nAppend = strlen(zAppend); zRet = (char*)sqlite3_malloc(nIn + nAppend); } if( zAppend && zRet ){ memcpy(zRet, zIn, nIn); memcpy(&zRet[nIn], zAppend, nAppend+1); }else{ sqlite3_free(zRet); zRet = 0; *pRc = SQLITE_NOMEM; } sqlite3_free(zAppend); sqlite3_free(zIn); } va_end(ap); return zRet; } static char *idxAppendColDefn( int *pRc, char *zIn, IdxTable *pTab, IdxConstraint *pCons ){ char *zRet = zIn; IdxColumn *p = &pTab->aCol[pCons->iCol]; if( zRet ) zRet = idxAppendText(pRc, zRet, ", "); zRet = idxAppendText(pRc, zRet, "%Q", p->zName); if( sqlite3_stricmp(p->zColl, pCons->zColl) ){ zRet = idxAppendText(pRc, zRet, " COLLATE %Q", pCons->zColl); } return zRet; } static int idxCreateFromCons( sqlite3 *dbm, IdxScan *pScan, IdxConstraint *pEq, IdxConstraint *pTail ){ int rc = SQLITE_OK; if( pEq || pTail ){ IdxTable *pTab = pScan->pTable; char *zCols = 0; char *zIdx = 0; IdxConstraint *pCons; int h = 0; for(pCons=pEq; pCons; pCons=pCons->pLink){ zCols = idxAppendColDefn(&rc, zCols, pTab, pCons); } for(pCons=pTail; pCons; pCons=pCons->pLink){ zCols = idxAppendColDefn(&rc, zCols, pTab, pCons); } /* Hash the list of columns to come up with a name for the index */ if( rc==SQLITE_OK ){ int i; for(i=0; zCols[i]; i++){ h += ((h<<3) + zCols[i]); } zIdx = sqlite3_mprintf("CREATE INDEX IF NOT EXISTS " "'%q_idx_%08x' ON %Q(%s)", pScan->zTable, h, pScan->zTable, zCols ); if( !zIdx ){ rc = SQLITE_NOMEM; }else{ rc = sqlite3_exec(dbm, zIdx, 0, 0, 0); printf("/* %s */\n", zIdx); } } sqlite3_free(zIdx); sqlite3_free(zCols); } return rc; } static int idxCreateFromWhere( sqlite3*, i64, IdxScan*, IdxWhere*, IdxConstraint*, IdxConstraint* ); static int idxCreateForeachOr( sqlite3 *dbm, i64 mask, /* Consider only these constraints */ IdxScan *pScan, /* Create indexes for this scan */ IdxWhere *pWhere, /* Read constraints from here */ IdxConstraint *pEq, /* == constraints for inclusion */ IdxConstraint *pTail /* range/ORDER BY constraints for inclusion */ ){ int rc = SQLITE_OK; IdxWhere *p1; IdxWhere *p2; for(p1=pWhere->pOr; p1 && rc==SQLITE_OK; p1=p1->pNextOr){ rc = idxCreateFromWhere(dbm, mask, pScan, p1, pEq, pTail); for(p2=p1->pSibling; p2 && rc==SQLITE_OK; p2=p2->pSibling){ rc = idxCreateFromWhere(dbm, mask, pScan, p2, pEq, pTail); } } return rc; } static int idxCreateFromWhere( sqlite3 *dbm, i64 mask, /* Consider only these constraints */ IdxScan *pScan, /* Create indexes for this scan */ IdxWhere *pWhere, /* Read constraints from here */ IdxConstraint *pEq, /* == constraints for inclusion */ IdxConstraint *pTail /* range/ORDER BY constraints for inclusion */ ){ IdxConstraint *p1 = pEq; IdxConstraint *pCon; int rc; /* Gather up all the == constraints that match the mask. */ for(pCon=pWhere->pEq; pCon; pCon=pCon->pNext){ if( (mask & pCon->depmask)==pCon->depmask ){ pCon->pLink = p1; p1 = pCon; } } /* Create an index using the == constraints collected above. And the ** range constraint/ORDER BY terms passed in by the caller, if any. */ rc = idxCreateFromCons(dbm, pScan, p1, pTail); if( rc==SQLITE_OK ){ rc = idxCreateForeachOr(dbm, mask, pScan, pWhere, p1, pTail); } /* If no range/ORDER BY passed by the caller, create a version of the ** index for each range constraint that matches the mask. */ if( pTail==0 ){ for(pCon=pWhere->pRange; rc==SQLITE_OK && pCon; pCon=pCon->pNext){ assert( pCon->pLink==0 ); if( (mask & pCon->depmask)==pCon->depmask ){ rc = idxCreateFromCons(dbm, pScan, p1, pCon); if( rc==SQLITE_OK ){ rc = idxCreateForeachOr(dbm, mask, pScan, pWhere, p1, pCon); } } } } return rc; } static int idxPrepareStmt( sqlite3 *db, /* Database handle to compile against */ const char *zSql, /* SQL statement to compile */ sqlite3_stmt **ppStmt, /* OUT: Compiled SQL statement */ char **pzErrmsg /* OUT: sqlite3_malloc()ed error message */ ){ int rc = sqlite3_prepare_v2(db, zSql, -1, ppStmt, 0); if( rc!=SQLITE_OK ){ *ppStmt = 0; idxDatabaseError(db, pzErrmsg); } return rc; } /* ** Create candidate indexes in database [dbm] based on the data in ** linked-list pScan. */ static int idxCreateCandidates( sqlite3 *dbm, IdxScan *pScan, char **pzErrmsg ){ int rc2; int rc = SQLITE_OK; sqlite3_stmt *pDepmask; /* Foreach depmask */ IdxScan *pIter; rc = idxPrepareStmt(dbm, "SELECT mask FROM depmask", &pDepmask, pzErrmsg); for(pIter=pScan; pIter && rc==SQLITE_OK; pIter=pIter->pNextScan){ IdxWhere *pWhere = &pIter->where; while( SQLITE_ROW==sqlite3_step(pDepmask) && rc==SQLITE_OK ){ i64 mask = sqlite3_column_int64(pDepmask, 0); rc = idxCreateFromWhere(dbm, mask, pIter, pWhere, 0, 0); if( rc==SQLITE_OK && pIter->pOrder ){ rc = idxCreateFromWhere(dbm, mask, pIter, pWhere, 0, pIter->pOrder); } } } rc2 = sqlite3_finalize(pDepmask); if( rc==SQLITE_OK ) rc = rc2; return rc; } static void idxScanFree(IdxScan *pScan){ } int idxFindIndexes( sqlite3 *dbm, /* Database handle */ const char *zSql, /* SQL to find indexes for */ void (*xOut)(void*, const char*), /* Output callback */ void *pOutCtx, /* Context for xOut() */ char **pzErrmsg /* OUT: Error message (sqlite3_malloc) */ ){ char *zExplain; sqlite3_stmt *pExplain; int rc; zExplain = sqlite3_mprintf("EXPLAIN QUERY PLAN %s", zSql); if( zExplain==0 ){ rc = SQLITE_NOMEM; }else{ rc = idxPrepareStmt(dbm, zExplain, &pExplain, pzErrmsg); sqlite3_free(zExplain); } if( rc!=SQLITE_OK ) return rc; while( sqlite3_step(pExplain)==SQLITE_ROW ){ int iCol; // for(iCol=0; iCol<sqlite3_column_count(pExplain); iCol++){ } xOut(pOutCtx, sqlite3_column_text(pExplain, 3)); } rc = sqlite3_finalize(pExplain); } /* ** The xOut callback is invoked to return command output to the user. The ** second argument is always a nul-terminated string. The first argument is ** passed zero if the string contains normal output or non-zero if it is an ** error message. */ int shellIndexesCommand( sqlite3 *db, /* Database handle */ const char *zSql, /* SQL to find indexes for */ void (*xOut)(void*, const char*), /* Output callback */ void *pOutCtx, /* Context for xOut() */ char **pzErrmsg /* OUT: Error message (sqlite3_malloc) */ ){ int rc = SQLITE_OK; sqlite3 *dbm = 0; IdxContext ctx; sqlite3_stmt *pStmt = 0; /* Statement compiled from zSql */ rc = registerPragmaVtabs(db); if( rc ) return rc; memset(&ctx, 0, sizeof(IdxContext)); /* Open an in-memory database to work with. The main in-memory ** database schema contains tables similar to those in the users ** database (handle db). The attached in-memory db (aux) contains ** application tables used by the code in this file. */ rc = sqlite3_open(":memory:", &dbm); if( rc==SQLITE_OK ){ rc = sqlite3_exec(dbm, "ATTACH ':memory:' AS aux;" "CREATE TABLE aux.depmask(mask PRIMARY KEY) WITHOUT ROWID;" "INSERT INTO aux.depmask VALUES(0);" , 0, 0, 0 ); } /* Prepare an INSERT statement for writing to aux.depmask */ if( rc==SQLITE_OK ){ rc = sqlite3_prepare_v2(dbm, "INSERT OR IGNORE INTO depmask SELECT mask | ?1 FROM depmask;", -1, &ctx.pInsertMask, 0 ); } if( rc!=SQLITE_OK ){ idxDatabaseError(dbm, pzErrmsg); goto indexes_out; } /* Analyze the SELECT statement in zSql. */ ctx.dbm = dbm; sqlite3_db_config(db, SQLITE_DBCONFIG_WHEREINFO, idxWhereInfo, (void*)&ctx); rc = sqlite3_prepare(db, zSql, -1, &pStmt, 0); sqlite3_db_config(db, SQLITE_DBCONFIG_WHEREINFO, (void*)0, (void*)0); if( rc!=SQLITE_OK ){ idxDatabaseError(db, pzErrmsg); goto indexes_out; } /* Create tables within the main in-memory database. These tables ** have the same names, columns and declared types as the tables in ** the user database. All constraints except for PRIMARY KEY are ** removed. */ rc = idxCreateTables(db, dbm, ctx.pScan, pzErrmsg); if( rc!=SQLITE_OK ){ goto indexes_out; } /* Create candidate indexes within the in-memory database file */ rc = idxCreateCandidates(dbm, ctx.pScan, pzErrmsg); if( rc!=SQLITE_OK ){ goto indexes_out; } rc = idxFindIndexes(dbm, zSql, xOut, pOutCtx, pzErrmsg); indexes_out: idxScanFree(ctx.pScan); sqlite3_close(dbm); return rc; } |