An attempt to allow automatic index creation on subqueries accessed via

co-routine.

FossilOrigin-Name: 521345add67e9dfd7df1446eb942aa0d84b9e6eb

manifest

@@ -1,5 +1,5 @@
-C Using\s"SELECT\sALL"\sinstead\sof\sjust\s"SELECT"\son\sa\squery\sthat\suses\sa\ssingle\nunflattenable\ssubquery\sor\sview\sin\sits\sFROM\sclause\swill\sforce\sthe\ssubquery\sto\nbe\smanifested\sinto\sa\stemporary\stable\srather\sthan\srun\sincrementally\susing\sa\nco-routine.\s\sThis\sis\sa\sstop-gap\smeans\sof\scontrolling\sthe\sdecision\sto\smanifest\nwhile\swe\stry\sto\swork\sout\sa\sbetter\sto\smake\sthat\sdecision\sautomatically.
+C An\sattempt\sto\sallow\sautomatic\sindex\screation\son\ssubqueries\saccessed\svia\nco-routine.
-D 2015-05-29T01:35:19.289
+D 2015-05-29T13:55:33.273
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 994bab32a3a69e0c35bd148b65cde49879772964
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -326,7 +326,7 @@ F src/vxworks.h c18586c8edc1bddbc15c004fa16aeb1e1342b4fb
 F src/wal.c ce2cb2d06faab54d1bce3e739bec79e063dd9113
 F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
 F src/walker.c c253b95b4ee44b21c406e2a1052636c31ea27804
-F src/where.c e71eae3b1383249c3b5d136d6b71ca8d28fb8d61
+F src/where.c 5eb9ab47f6e256f0f241a000469bc4e1bd2cb085
 F src/whereInt.h a6f5a762bc1b4b1c76e1cea79976b437ac35a435
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
@@ -1280,7 +1280,10 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 0abfd78ceb09b7f7c27c688c8e3fe93268a13b32
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P 7da7dc714bf1fe34b38fc33a923490dfd3e4f070
+P a29e117d7ecec05da949348689dbfb0d3acb1280
-R 499acad2035bec51403566408ee68110
+R 88c52c7945c3c5cf23282c30dc23f438
+T *branch * coroutine-autoindex
+T *sym-coroutine-autoindex *
+T -sym-trunk *
 U drh
-Z 2eaa693f71c1ef80818c82e114933ddd
+Z 77000af208e80e6a672a8b20d82a8232

manifest.uuid

@@ -1 +1 @@
-a29e117d7ecec05da949348689dbfb0d3acb1280
+521345add67e9dfd7df1446eb942aa0d84b9e6eb

src/where.c

@@ -1660,6 +1660,36 @@ static LogEst estLog(LogEst N){
   return N<=10 ? 0 : sqlite3LogEst(N) - 33;
 }
 
+/*
+** Convert OP_Column opcodes to OP_Copy in previously generated code.
+**
+** This routine runs over generated VDBE code and translates OP_Column
+** opcodes into OP_Copy, and OP_Rowid into OP_Null, when the table is being
+** accessed via co-routine instead of via table lookup.
+*/
+static void translateColumnToCopy(
+  Vdbe *v,            /* The VDBE containing code to translate */
+  int iStart,         /* Translate from this opcode to the end */
+  int iTabCur,        /* OP_Column/OP_Rowid references to this table */
+  int iRegister       /* The first column is in this register */
+){
+  VdbeOp *pOp = sqlite3VdbeGetOp(v, iStart);
+  int iEnd = sqlite3VdbeCurrentAddr(v);
+  for(; iStart<iEnd; iStart++, pOp++){
+    if( pOp->p1!=iTabCur ) continue;
+    if( pOp->opcode==OP_Column ){
+      pOp->opcode = OP_Copy;
+      pOp->p1 = pOp->p2 + iRegister;
+      pOp->p2 = pOp->p3;
+      pOp->p3 = 0;
+    }else if( pOp->opcode==OP_Rowid ){
+      pOp->opcode = OP_Null;
+      pOp->p1 = 0;
+      pOp->p3 = 0;
+    }
+  }
+}
+
 /*
 ** Two routines for printing the content of an sqlite3_index_info
 ** structure.  Used for testing and debugging only.  If neither
@@ -1762,6 +1792,7 @@ static void constructAutomaticIndex(
   u8 sentWarning = 0;         /* True if a warnning has been issued */
   Expr *pPartial = 0;         /* Partial Index Expression */
   int iContinue = 0;          /* Jump here to skip excluded rows */
+  struct SrcList_item *pTabItem;  /* FROM clause term being indexed */
 
   /* Generate code to skip over the creation and initialization of the
   ** transient index on 2nd and subsequent iterations of the loop. */
@@ -1887,7 +1918,16 @@ static void constructAutomaticIndex(
 
   /* Fill the automatic index with content */
   sqlite3ExprCachePush(pParse);
-  addrTop = sqlite3VdbeAddOp1(v, OP_Rewind, pLevel->iTabCur); VdbeCoverage(v);
+  pTabItem = &pWC->pWInfo->pTabList->a[pLevel->iFrom];
+  if( pTabItem->viaCoroutine ){
+    int regYield = pTabItem->regReturn;
+    sqlite3VdbeAddOp3(v, OP_InitCoroutine, regYield, 0, pTabItem->addrFillSub);
+    addrTop =  sqlite3VdbeAddOp1(v, OP_Yield, regYield);
+    VdbeCoverage(v);
+    VdbeComment((v, "next row of \"%s\"", pTabItem->pTab->zName));
+  }else{
+    addrTop = sqlite3VdbeAddOp1(v, OP_Rewind, pLevel->iTabCur); VdbeCoverage(v);
+  }
   if( pPartial ){
     iContinue = sqlite3VdbeMakeLabel(v);
     sqlite3ExprIfFalse(pParse, pPartial, iContinue, SQLITE_JUMPIFNULL);
@@ -1898,7 +1938,13 @@ static void constructAutomaticIndex(
   sqlite3VdbeAddOp2(v, OP_IdxInsert, pLevel->iIdxCur, regRecord);
   sqlite3VdbeChangeP5(v, OPFLAG_USESEEKRESULT);
   if( pPartial ) sqlite3VdbeResolveLabel(v, iContinue);
-  sqlite3VdbeAddOp2(v, OP_Next, pLevel->iTabCur, addrTop+1); VdbeCoverage(v);
+  if( pTabItem->viaCoroutine ){
+    translateColumnToCopy(v, addrTop, pLevel->iTabCur, pTabItem->regResult);
+    sqlite3VdbeAddOp2(v, OP_Goto, 0, addrTop);
+    pTabItem->viaCoroutine = 0;
+  }else{
+    sqlite3VdbeAddOp2(v, OP_Next, pLevel->iTabCur, addrTop+1); VdbeCoverage(v);
+  }
   sqlite3VdbeChangeP5(v, SQLITE_STMTSTATUS_AUTOINDEX);
   sqlite3VdbeJumpHere(v, addrTop);
   sqlite3ReleaseTempReg(pParse, regRecord);
@@ -5178,7 +5224,6 @@ static int whereLoopAddBtree(
    && (pWInfo->wctrlFlags & WHERE_NO_AUTOINDEX)==0
    && (pWInfo->pParse->db->flags & SQLITE_AutoIndex)!=0
    && pSrc->pIndex==0
-   && !pSrc->viaCoroutine
    && !pSrc->notIndexed
    && HasRowid(pTab)
    && !pSrc->isCorrelated
@@ -7017,26 +7062,12 @@ void sqlite3WhereEnd(WhereInfo *pWInfo){
     pLoop = pLevel->pWLoop;
 
     /* For a co-routine, change all OP_Column references to the table of
-    ** the co-routine into OP_SCopy of result contained in a register.
+    ** the co-routine into OP_Copy of result contained in a register.
     ** OP_Rowid becomes OP_Null.
     */
     if( pTabItem->viaCoroutine && !db->mallocFailed ){
-      last = sqlite3VdbeCurrentAddr(v);
+      translateColumnToCopy(v, pLevel->addrBody, pLevel->iTabCur,
-      k = pLevel->addrBody;
+                            pTabItem->regResult);
-      pOp = sqlite3VdbeGetOp(v, k);
-      for(; k<last; k++, pOp++){
-        if( pOp->p1!=pLevel->iTabCur ) continue;
-        if( pOp->opcode==OP_Column ){
-          pOp->opcode = OP_Copy;
-          pOp->p1 = pOp->p2 + pTabItem->regResult;
-          pOp->p2 = pOp->p3;
-          pOp->p3 = 0;
-        }else if( pOp->opcode==OP_Rowid ){
-          pOp->opcode = OP_Null;
-          pOp->p1 = 0;
-          pOp->p3 = 0;
-        }
-      }
       continue;
     }