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Add a NEVER() to the code generator. Change the parameter name "mExtra" 

to "mPrereq" in the query planner, to more closely reflect its meaning.

FossilOrigin-Name: 721ae51e443647291f3a8f7f2128aa410fee2682
This commit is contained in:
drh 2016-03-08 01:11:51 +00:00
parent fb826b8c13
commit 599d576456
4 changed files with 42 additions and 42 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Changes\sso\sthat\ssome\sassert()s\sin\sthe\svirtual\stable\squery\splanner\sare\ncorrect\seven\sfollowing\san\sOOM\serror.
D 2016-03-08T00:39:58.482
C Add\sa\sNEVER()\sto\sthe\scode\sgenerator.\s\sChange\sthe\sparameter\sname\s"mExtra"\nto\s"mPrereq"\sin\sthe\squery\splanner,\sto\smore\sclosely\sreflect\sits\smeaning.
D 2016-03-08T01:11:51.292
F Makefile.in f53429fb2f313c099283659d0df6f20f932c861f
F Makefile.linux-gcc 7bc79876b875010e8c8f9502eb935ca92aa3c434
F Makefile.msc df0bf9ff7f8b3f4dd9fb4cc43f92fe58f6ec5c66
@ -428,9 +428,9 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
F src/wal.c 10deb6b43887662691e5f53d10b3c171c401169b
F src/wal.h 2f7c831cf3b071fa548bf2d5cac640846a7ff19c
F src/walker.c 0f142b5bd3ed2041fc52d773880748b212e63354
F src/where.c ccc62c39af1e6340f6af36fcf68efb96482d4c3a
F src/where.c 3787158e3b365eec7553d6f1d6596b7fa64ea6de
F src/whereInt.h 93297d56edd137b7ea004490690fb6e2ce028a34
F src/wherecode.c 36ea3526e4d297b8438453689176c6543fe67b3a
F src/wherecode.c 863aedf086131743763c1960637fde904eadc442
F src/whereexpr.c fb87944b1254234e5bba671aaf6dee476241506a
F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
@ -1454,7 +1454,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
P cddf69dbc46f10ee7e87538dd850e086386b544c
R eadc238ea6455af5bdaa5c7ea27cb6ae
P 9805f6f85211dcb5a0ab3ceca204e6f2e48530ea
R ee7409507ed80149a169811d9e037a32
U drh
Z 93924e30a271561dfe424f31cad070b7
Z 2ec5edc1158dca51232e491f1a3a4594

2
manifest.uuid
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@ -1 +1 @@
9805f6f85211dcb5a0ab3ceca204e6f2e48530ea
721ae51e443647291f3a8f7f2128aa410fee2682

66
src/where.c
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@ -2554,7 +2554,7 @@ static int whereUsablePartialIndex(int iTab, WhereClause *pWC, Expr *pWhere){
*/
static int whereLoopAddBtree(
WhereLoopBuilder *pBuilder, /* WHERE clause information */
Bitmask mExtra /* Extra prerequesites for using this table */
Bitmask mPrereq /* Extra prerequesites for using this table */
){
WhereInfo *pWInfo; /* WHERE analysis context */
Index *pProbe; /* An index we are evaluating */
@ -2654,7 +2654,7 @@ static int whereLoopAddBtree(
pNew->nOut = 43; assert( 43==sqlite3LogEst(20) );
pNew->rRun = sqlite3LogEstAdd(rLogSize,pNew->nOut);
pNew->wsFlags = WHERE_AUTO_INDEX;
pNew->prereq = mExtra | pTerm->prereqRight;
pNew->prereq = mPrereq | pTerm->prereqRight;
rc = whereLoopInsert(pBuilder, pNew);
}
}
@ -2675,7 +2675,7 @@ static int whereLoopAddBtree(
pNew->nLTerm = 0;
pNew->iSortIdx = 0;
pNew->rSetup = 0;
pNew->prereq = mExtra;
pNew->prereq = mPrereq;
pNew->nOut = rSize;
pNew->u.btree.pIndex = pProbe;
b = indexMightHelpWithOrderBy(pBuilder, pProbe, pSrc->iCursor);
@ -2762,7 +2762,7 @@ static int whereLoopAddBtree(
** * It is not one of the operators specified in the mExclude mask passed
** as the fourth argument (which in practice is either WO_IN or 0).
**
** Argument mExtra is a mask of tables that must be scanned before the
** Argument mPrereq is a mask of tables that must be scanned before the
** virtual table in question. These are added to the plans prerequisites
** before it is added to pBuilder.
**
@ -2771,7 +2771,7 @@ static int whereLoopAddBtree(
*/
static int whereLoopAddVirtualOne(
WhereLoopBuilder *pBuilder,
Bitmask mExtra, /* Mask of tables that must be used. */
Bitmask mPrereq, /* Mask of tables that must be used. */
Bitmask mUsable, /* Mask of usable prereqs */
u16 mExclude, /* Exclude terms for this operator */
sqlite3_index_info *pIdxInfo, /* Populated object for xBestIndex */
@ -2788,9 +2788,9 @@ static int whereLoopAddVirtualOne(
struct SrcList_item *pSrc = &pBuilder->pWInfo->pTabList->a[pNew->iTab];
int nConstraint = pIdxInfo->nConstraint;
assert( (mUsable & mExtra)==mExtra );
assert( (mUsable & mPrereq)==mPrereq );
*pbIn = 0;
pNew->prereq = mExtra;
pNew->prereq = mPrereq;
/* Set the usable flag on the subset of constraints identified by
** arguments mUsable and mExclude. */
@ -2897,8 +2897,8 @@ static int whereLoopAddVirtualOne(
** Add all WhereLoop objects for a table of the join identified by
** pBuilder->pNew->iTab. That table is guaranteed to be a virtual table.
**
** If there are no LEFT or CROSS JOIN joins in the query, both mExtra and
** mUnusable are set to 0. Otherwise, mExtra is a mask of all FROM clause
** If there are no LEFT or CROSS JOIN joins in the query, both mPrereq and
** mUnusable are set to 0. Otherwise, mPrereq is a mask of all FROM clause
** entries that occur before the virtual table in the FROM clause and are
** separated from it by at least one LEFT or CROSS JOIN. Similarly, the
** mUnusable mask contains all FROM clause entries that occur after the
@ -2909,18 +2909,18 @@ static int whereLoopAddVirtualOne(
**
** ... FROM t1, t2 LEFT JOIN t3, t4, vt CROSS JOIN t5, t6;
**
** then mExtra corresponds to (t1, t2) and mUnusable to (t5, t6).
** then mPrereq corresponds to (t1, t2) and mUnusable to (t5, t6).
**
** All the tables in mExtra must be scanned before the current virtual
** All the tables in mPrereq must be scanned before the current virtual
** table. So any terms for which all prerequisites are satisfied by
** mExtra may be specified as "usable" in all calls to xBestIndex.
** mPrereq may be specified as "usable" in all calls to xBestIndex.
** Conversely, all tables in mUnusable must be scanned after the current
** virtual table, so any terms for which the prerequisites overlap with
** mUnusable should always be configured as "not-usable" for xBestIndex.
*/
static int whereLoopAddVirtual(
WhereLoopBuilder *pBuilder, /* WHERE clause information */
Bitmask mExtra, /* Tables that must be scanned before this one */
Bitmask mPrereq, /* Tables that must be scanned before this one */
Bitmask mUnusable /* Tables that must be scanned after this one */
){
int rc = SQLITE_OK; /* Return code */
@ -2934,7 +2934,7 @@ static int whereLoopAddVirtual(
WhereLoop *pNew;
Bitmask mBest; /* Tables used by best possible plan */
assert( (mExtra & mUnusable)==0 );
assert( (mPrereq & mUnusable)==0 );
pWInfo = pBuilder->pWInfo;
pParse = pWInfo->pParse;
pWC = pBuilder->pWC;
@ -2954,8 +2954,8 @@ static int whereLoopAddVirtual(
}
/* First call xBestIndex() with all constraints usable. */
rc = whereLoopAddVirtualOne(pBuilder, mExtra, (Bitmask)(-1), 0, p, &bIn);
mBest = pNew->prereq & ~mExtra;
rc = whereLoopAddVirtualOne(pBuilder, mPrereq, (Bitmask)(-1), 0, p, &bIn);
mBest = pNew->prereq & ~mPrereq;
/* If the call to xBestIndex() with all terms enabled produced a plan
** that does not require any source tables, there is no point in making
@ -2971,15 +2971,15 @@ static int whereLoopAddVirtual(
/* If the plan produced by the earlier call uses an IN(...) term, call
** xBestIndex again, this time with IN(...) terms disabled. */
if( rc==SQLITE_OK && bIn ){
rc = whereLoopAddVirtualOne(pBuilder, mExtra, (Bitmask)-1, WO_IN, p,&bIn);
mBestNoIn = pNew->prereq & ~mExtra;
rc = whereLoopAddVirtualOne(pBuilder,mPrereq,(Bitmask)-1,WO_IN,p,&bIn);
mBestNoIn = pNew->prereq & ~mPrereq;
if( mBestNoIn==0 ){
seenZero = 1;
if( bIn==0 ) seenZeroNoIN = 1;
}
}
/* Call xBestIndex once for each distinct value of (prereqRight & ~mExtra)
/* Call xBestIndex once for each distinct value of (prereqRight & ~mPrereq)
** in the set of terms that apply to the current virtual table. */
while( rc==SQLITE_OK ){
int i;
@ -2987,15 +2987,15 @@ static int whereLoopAddVirtual(
assert( mNext>0 );
for(i=0; i<nConstraint; i++){
Bitmask mThis = (
pWC->a[p->aConstraint[i].iTermOffset].prereqRight & ~mExtra
pWC->a[p->aConstraint[i].iTermOffset].prereqRight & ~mPrereq
);
if( mThis>mPrev && mThis<mNext ) mNext = mThis;
}
mPrev = mNext;
if( mNext==(Bitmask)(-1) ) break;
if( mNext==mBest || mNext==mBestNoIn ) continue;
rc = whereLoopAddVirtualOne(pBuilder, mExtra, mNext|mExtra, 0, p, &bIn);
if( pNew->prereq==mExtra ){
rc = whereLoopAddVirtualOne(pBuilder, mPrereq, mNext|mPrereq, 0, p, &bIn);
if( pNew->prereq==mPrereq ){
seenZero = 1;
if( bIn==0 ) seenZeroNoIN = 1;
}
@ -3005,7 +3005,7 @@ static int whereLoopAddVirtual(
** that requires no source tables at all (i.e. one guaranteed to be
** usable), make a call here with all source tables disabled */
if( rc==SQLITE_OK && seenZero==0 ){
rc = whereLoopAddVirtualOne(pBuilder, mExtra, mExtra, 0, p, &bIn);
rc = whereLoopAddVirtualOne(pBuilder, mPrereq, mPrereq, 0, p, &bIn);
if( bIn==0 ) seenZeroNoIN = 1;
}
@ -3013,7 +3013,7 @@ static int whereLoopAddVirtual(
** that requires no source tables at all and does not use an IN(...)
** operator, make a final call to obtain one here. */
if( rc==SQLITE_OK && seenZeroNoIN==0 ){
rc = whereLoopAddVirtualOne(pBuilder, mExtra, mExtra, WO_IN, p, &bIn);
rc = whereLoopAddVirtualOne(pBuilder, mPrereq, mPrereq, WO_IN, p, &bIn);
}
}
@ -3029,7 +3029,7 @@ static int whereLoopAddVirtual(
*/
static int whereLoopAddOr(
WhereLoopBuilder *pBuilder,
Bitmask mExtra,
Bitmask mPrereq,
Bitmask mUnusable
){
WhereInfo *pWInfo = pBuilder->pWInfo;
@ -3090,14 +3090,14 @@ static int whereLoopAddOr(
#endif
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( IsVirtual(pItem->pTab) ){
rc = whereLoopAddVirtual(&sSubBuild, mExtra, mUnusable);
rc = whereLoopAddVirtual(&sSubBuild, mPrereq, mUnusable);
}else
#endif
{
rc = whereLoopAddBtree(&sSubBuild, mExtra);
rc = whereLoopAddBtree(&sSubBuild, mPrereq);
}
if( rc==SQLITE_OK ){
rc = whereLoopAddOr(&sSubBuild, mExtra, mUnusable);
rc = whereLoopAddOr(&sSubBuild, mPrereq, mUnusable);
}
assert( rc==SQLITE_OK || sCur.n==0 );
if( sCur.n==0 ){
@ -3154,7 +3154,7 @@ static int whereLoopAddOr(
*/
static int whereLoopAddAll(WhereLoopBuilder *pBuilder){
WhereInfo *pWInfo = pBuilder->pWInfo;
Bitmask mExtra = 0;
Bitmask mPrereq = 0;
Bitmask mPrior = 0;
int iTab;
SrcList *pTabList = pWInfo->pTabList;
@ -3175,7 +3175,7 @@ static int whereLoopAddAll(WhereLoopBuilder *pBuilder){
if( ((pItem->fg.jointype|priorJointype) & (JT_LEFT|JT_CROSS))!=0 ){
/* This condition is true when pItem is the FROM clause term on the
** right-hand-side of a LEFT or CROSS JOIN. */
mExtra = mPrior;
mPrereq = mPrior;
}
priorJointype = pItem->fg.jointype;
if( IsVirtual(pItem->pTab) ){
@ -3185,12 +3185,12 @@ static int whereLoopAddAll(WhereLoopBuilder *pBuilder){
mUnusable |= sqlite3WhereGetMask(&pWInfo->sMaskSet, p->iCursor);
}
}
rc = whereLoopAddVirtual(pBuilder, mExtra, mUnusable);
rc = whereLoopAddVirtual(pBuilder, mPrereq, mUnusable);
}else{
rc = whereLoopAddBtree(pBuilder, mExtra);
rc = whereLoopAddBtree(pBuilder, mPrereq);
}
if( rc==SQLITE_OK ){
rc = whereLoopAddOr(pBuilder, mExtra, mUnusable);
rc = whereLoopAddOr(pBuilder, mPrereq, mUnusable);
}
mPrior |= pNew->maskSelf;
if( rc || db->mallocFailed ) break;

2
src/wherecode.c
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@ -882,7 +882,7 @@ Bitmask sqlite3WhereCodeOneLoopStart(
for(j=0; j<nConstraint; j++){
int iTarget = iReg+j+2;
pTerm = pLoop->aLTerm[j];
if( pTerm==0 ) continue;
if( NEVER(pTerm==0) ) continue;
if( pTerm->eOperator & WO_IN ){
codeEqualityTerm(pParse, pTerm, pLevel, j, bRev, iTarget);
addrNotFound = pLevel->addrNxt;