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In the query planner, restore the former aggressiveness in reordering of

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FROM clause terms that existed prior to version 3.39.0 for queries that
contain no RIGHT or FULL JOINs.

FossilOrigin-Name: 92d60b64ebfc2d1f0a9cabaa88e7bf0d11737ed01a77b627af10dd1b96a5321c
This commit is contained in:
drh 2022-07-15 20:39:39 +00:00
parent 40e3fa3035
commit 02cb3ff004
3 changed files with 16 additions and 14 deletions
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14
manifest
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@ -1,5 +1,5 @@
C Fix\sa\smemory\sleak\sin\sfts3\sthat\scould\soccur\swhen\sprocessing\sa\scorrupt\sdatabase.
D 2022-07-15T15:08:48.874
C In\sthe\squery\splanner,\srestore\sthe\sformer\saggressiveness\sin\sreordering\sof\nFROM\sclause\sterms\sthat\sexisted\sprior\sto\sversion\s3.39.0\sfor\squeries\sthat\ncontain\sno\sRIGHT\sor\sFULL\sJOINs.
D 2022-07-15T20:39:39.491
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F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@ -657,7 +657,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
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F src/walker.c f890a3298418d7cba3b69b8803594fdc484ea241206a8dfa99db6dd36f8cbb3b
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F src/whereInt.h b48ca529ffe293c18cbfa8326af18a09e39910de66fb3e96ef788c7cbf8ef3a7
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# Remove this line to create a well-formed Fossil manifest.

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src/where.c
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@ -4181,6 +4181,7 @@ static int whereLoopAddAll(WhereLoopBuilder *pBuilder){
sqlite3 *db = pWInfo->pParse->db;
int rc = SQLITE_OK;
int bFirstPastRJ = 0;
int hasRightJoin = 0;
WhereLoop *pNew;
@ -4207,15 +4208,16 @@ static int whereLoopAddAll(WhereLoopBuilder *pBuilder){
** prevents the right operand of a RIGHT JOIN from being swapped with
** other elements even further to the right.
**
** The JT_LTORJ term prevents any FROM-clause term reordering for terms
** to the left of a RIGHT JOIN. This is conservative. Relaxing this
** constraint somewhat to prevent terms from crossing from the right
** side of a LEFT JOIN over to the left side when they are on the
** left side of a RIGHT JOIN would be sufficient for all known failure
** cases. FIX ME: Implement this optimization.
** The JT_LTORJ case and the hasRightJoin flag work together to
** prevent FROM-clause terms from moving from the right side of
** a LEFT JOIN over to the left side of that join if the LEFT JOIN
** is itself on the left side of a RIGHT JOIN.
*/
if( pItem->fg.jointype & JT_LTORJ ) hasRightJoin = 1;
mPrereq |= mPrior;
bFirstPastRJ = (pItem->fg.jointype & JT_RIGHT)!=0;
}else if( !hasRightJoin ){
mPrereq = 0;
}
#ifndef SQLITE_OMIT_VIRTUALTABLE
if( IsVirtual(pItem->pTab) ){