For the OR-optimization, avoid generating OP_OpenRead opcodes that reopen

exactly the same index.

FossilOrigin-Name: b67a6e33f23ce5f5d9a545fa9d6700a7ed636901

manifest

@@ -1,5 +1,5 @@
-C Limit\sthe\smaximum\sSQLITE_MAX_ATTACHED\sto\s127,\ssince\sa\ssigned\scharacter\nis\ssometimes\sused\sto\sstore\sthe\sdatabase\sindex.
+C For\sthe\sOR-optimization,\savoid\sgenerating\sOP_OpenRead\sopcodes\sthat\sreopen\nexactly\sthe\ssame\sindex.
-D 2014-07-21T20:07:17.299
+D 2014-07-22T00:40:45.480
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 5eb79e334a5de69c87740edd56af6527dd219308
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -227,7 +227,7 @@ F src/shell.c 566aee8213372a2e81ba0eb34e9759f7b2574009
 F src/sqlite.h.in fd8e3a36b0aded082dc93a4b89c1e85324b4cf75
 F src/sqlite3.rc 11094cc6a157a028b301a9f06b3d03089ea37c3e
 F src/sqlite3ext.h 886f5a34de171002ad46fae8c36a7d8051c190fc
-F src/sqliteInt.h 5dbcdcf81cb15e77df16f88699a15f7af491c580
+F src/sqliteInt.h 0991b31a98c6ce072d255954af617baf50735eb1
 F src/sqliteLimit.h 164b0e6749d31e0daa1a4589a169d31c0dec7b3d
 F src/status.c 7ac05a5c7017d0b9f0b4bcd701228b784f987158
 F src/table.c 2cd62736f845d82200acfa1287e33feb3c15d62e
@@ -296,7 +296,7 @@ F src/vtab.c 21b932841e51ebd7d075e2d0ad1415dce8d2d5fd
 F src/wal.c 264df50a1b33124130b23180ded2e2c5663c652a
 F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
 F src/walker.c 11edb74d587bc87b33ca96a5173e3ec1b8389e45
-F src/where.c 3a451b00516b59f414c59f817508edce51c732f1
+F src/where.c 4f8dce8f4e50b3b3675e8af7811e48526d6b4be2
 F src/whereInt.h 929c1349b5355fd44f22cee5c14d72b3329c58a6
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
@@ -1182,7 +1182,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 1a817ae2f35fa0396148dda2782cd4f919bf5c6f
+P f1c76c7c4c7d16855db60d16e23ecdf8d7ca862a
-R 848516fae6f90d131f9449e42d77b0c0
+R ff4e333e5c258e291fb4ff256a0eb1e1
 U drh
-Z 0a273a2cc8050e8888f6349db4185a5f
+Z 9049ac2491ab8361811966ab022cf8d0

manifest.uuid

@@ -1 +1 @@
-f1c76c7c4c7d16855db60d16e23ecdf8d7ca862a
+b67a6e33f23ce5f5d9a545fa9d6700a7ed636901

src/sqliteInt.h

@@ -2136,6 +2136,7 @@ struct SrcList {
 #define WHERE_DISTINCTBY       0x0200 /* pOrderby is really a DISTINCT clause */
 #define WHERE_WANT_DISTINCT    0x0400 /* All output needs to be distinct */
 #define WHERE_SORTBYGROUP      0x0800 /* Support sqlite3WhereIsSorted() */
+#define WHERE_OR_INDEX_OPEN    0x1000 /* OP_OpenRead for the OR index exists */
 
 /* Allowed return values from sqlite3WhereIsDistinct()
 */

src/where.c

@@ -3422,6 +3422,7 @@ static Bitmask codeOneLoopStart(
     int iRetInit;                             /* Address of regReturn init */
     int untestedTerms = 0;             /* Some terms not completely tested */
     int ii;                            /* Loop counter */
+    int subWctrlFlags;                 /* wctrlFlags for sub-queries */
     Expr *pAndExpr = 0;                /* An ".. AND (...)" expression */
     Table *pTab = pTabItem->pTab;
    
@@ -3517,6 +3518,8 @@ static Bitmask codeOneLoopStart(
     ** eliminating duplicates from other WHERE clauses, the action for each
     ** sub-WHERE clause is to to invoke the main loop body as a subroutine.
     */
+    subWctrlFlags = WHERE_OMIT_OPEN_CLOSE | WHERE_AND_ONLY |
+                    WHERE_FORCE_TABLE | WHERE_ONETABLE_ONLY;
     for(ii=0; ii<pOrWc->nTerm; ii++){
       WhereTerm *pOrTerm = &pOrWc->a[ii];
       if( pOrTerm->leftCursor==iCur || (pOrTerm->eOperator & WO_AND)!=0 ){
@@ -3529,8 +3532,7 @@ static Bitmask codeOneLoopStart(
         }
         /* Loop through table entries that match term pOrTerm. */
         pSubWInfo = sqlite3WhereBegin(pParse, pOrTab, pOrExpr, 0, 0,
-                        WHERE_OMIT_OPEN_CLOSE | WHERE_AND_ONLY |
+                        subWctrlFlags, iCovCur);
-                        WHERE_FORCE_TABLE | WHERE_ONETABLE_ONLY, iCovCur);
         assert( pSubWInfo || pParse->nErr || db->mallocFailed );
         if( pSubWInfo ){
           WhereLoop *pSubLoop;
@@ -3621,6 +3623,7 @@ static Bitmask codeOneLoopStart(
           ){
             assert( pSubWInfo->a[0].iIdxCur==iCovCur );
             pCov = pSubLoop->u.btree.pIndex;
+            subWctrlFlags |= WHERE_OR_INDEX_OPEN;
           }else{
             pCov = 0;
           }
@@ -6212,6 +6215,18 @@ WhereInfo *sqlite3WhereBegin(
         pWInfo->aiCurOnePass[1] = iIndexCur;
       }else if( iIdxCur && (wctrlFlags & WHERE_ONETABLE_ONLY)!=0 ){
         iIndexCur = iIdxCur;
+        if( (wctrlFlags & WHERE_OR_INDEX_OPEN)!=0 ){
+          /* For 2nd and subsequent subqueries for processing OR terms,
+          ** try to reuse the previous OP_OpenRead, if there is one.  The
+          ** WHERE_OR_INDEX_OPEN bit will only be set if there is a prior
+          ** OP_OpenRead opcode on cursor iIndexCur, so the while() loop
+          ** below is guaranteed to terminate.
+          */
+          VdbeOp *pOp = sqlite3VdbeGetOp(v, -1);
+          while( pOp->opcode!=OP_OpenRead || pOp->p1!=iIndexCur ) pOp--;
+          assert( pOp->p3==iDb );
+          if( pOp->p2==pIx->tnum ) op = 0;
+        }
       }else{
         iIndexCur = pParse->nTab++;
       }