From: drh <>
Date: Tue, 2 Apr 2024 18:48:25 +0000 (+0000)
Subject: Fix typos in comments.  Provided ".wheretrace" debugging output for the
X-Git-Url: http://git.ipfire.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=80fe886efc20f6aab4fe5cb6d5404eed7e04d122;p=thirdparty%2Fsqlite.git

Fix typos in comments.  Provided ".wheretrace" debugging output for the
interstage heuristic module.  Do omit automatic index loops in the
interstage heuristic.

FossilOrigin-Name: 357d9513d2bd13c4e9f227300d43a04d13ae1d34b0b5ec55e8b94eb3204d1921
---

diff --git a/manifest b/manifest
index e0fc255093..0509169ebf 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Fix\stable-valued\sfunctions\sso\sthat\sthey\swill\swork\sas\sthe\sright\stable\nin\sa\sLEFT\sJOIN.\s\sTicket\s[2ae0c599b735d59e]
-D 2024-04-02T18:31:48.544
+C Fix\stypos\sin\scomments.\s\sProvided\s".wheretrace"\sdebugging\soutput\sfor\sthe\ninterstage\sheuristic\smodule.\s\sDo\somit\sautomatic\sindex\sloops\sin\sthe\ninterstage\sheuristic.
+D 2024-04-02T18:48:25.553
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -604,7 +604,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 F src/wal.c 9eccc7ebb532a7b0fd3cabc16cff576b9afa763472272db67d84fb8cec96f5c0
 F src/wal.h 606292549f5a7be50b6227bd685fa76e3a4affad71bb8ac5ce4cb5c79f6a176a
 F src/walker.c 7607f1a68130c028255d8d56094ea602fc402c79e1e35a46e6282849d90d5fe4
-F src/where.c 9c4a3b64e633941b5dc4e3020f3b53fd2430374dde4d32547c6402b57eeff7d6
+F src/where.c 88042f93c5955c628ee77ff9b1ff675527c92ff5efbc7dbd63c01ae45c2e5069
 F src/whereInt.h 064a1508edcc9af400a3b79211ba55e553fab6451b797a31334c0d11cbb7debb
 F src/wherecode.c cf67460973119c7b2141ad67daf8368dfb4871f225e2489f95effaa139007bfd
 F src/whereexpr.c 9813b81c1bb5c9e90c093d3be7b842fec49072ef6b53c454756aa986735d1d36
@@ -1675,7 +1675,7 @@ F test/whereI.test a2874062140ed4aba9ffae76e6190a3df6fc73d1373fdfa8fd632945082a5
 F test/whereJ.test 88287550f6ee604422403b053455b1ad894eeaa5c35d348532dfa1439286cb9a
 F test/whereK.test f8e3cf26a8513ecc7f514f54df9f0572c046c42b
 F test/whereL.test 0a19fc44cd1122040f56c934f1b14d0ca85bde28f270268a428dd9796ea0634c
-F test/whereN.test 63a3584b71acfb6963416de82f26c6b1644abc5ca6080c76546b9246734c8803
+F test/whereN.test d205fe91148c4bfc50b668ce9f8ebcaafd4ad806447d5bfee8c482d4cd98545c
 F test/wherefault.test 1374c3aa198388925246475f84ad4cd5f9528864
 F test/wherelfault.test 9012e4ef5259058b771606616bd007af5d154e64cc25fa9fd4170f6411db44e3
 F test/wherelimit.test 592081800806d297dd7449b1030c863d2883d6d42901837ccd2e5a9bd962edb0
@@ -1821,9 +1821,9 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 74b247d958d74782302546dcce8c8d8fba021b7f3d801ef6823225fb3213065f
-Q +2c35d3f67b67a53ead08b1c395e7ca8e5bf65f94a5a962a0562994a3c66c95d9
-R 15c8cc18c8d04cd7d5868c63d03458ec
+P 1f97086d628b6f52e6f9a87cd9d2c365f3c51f5b33c5c36a3f83889ec08765be
+Q +186dcae19e249db36de15f295999cff25063b54ee3d5d481cd2ba99b6d13148e
+R 72348ce53a15ea8deb2d0622361d010b
 U drh
-Z 1d3e014b02d3781f05c16bb73c514800
+Z 298c3dc9319a58678b6aa3cd002b5e96
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 44c776cace..aa7ed233c5 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-1f97086d628b6f52e6f9a87cd9d2c365f3c51f5b33c5c36a3f83889ec08765be
\ No newline at end of file
+357d9513d2bd13c4e9f227300d43a04d13ae1d34b0b5ec55e8b94eb3204d1921
\ No newline at end of file
diff --git a/src/where.c b/src/where.c
index 30f3a899b8..179da3d0b4 100644
--- a/src/where.c
+++ b/src/where.c
@@ -4507,15 +4507,15 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
 ** Except, if the first solver() call generated a full-table scan in an outer
 ** loop then stop this analysis at the first full-scan, since the second
 ** solver() run might try to swap that full-scan for another in order to
-** get the output into the correct order.  In other words, we do *not* want
-** to inhibit a rewrites like this:
+** get the output into the correct order.  In other words, we allow a
+** rewrite like this:
 **
 **     First Solver()                      Second Solver()
 **       |-- SCAN t1                         |-- SCAN t2
 **       |-- SEARCH t2                       `-- SEARCH t1
 **       `-- SORT USING B-TREE
 **
-** Rather, the purpose of this routine is to inhibit rewrites such as:
+** The purpose of this routine is to disallow rewrites such as:
 **
 **     First Solver()                      Second Solver()
 **       |-- SEARCH t1                       |-- SCAN t2     <--- bad!
@@ -4527,6 +4527,9 @@ static int wherePathSolver(WhereInfo *pWInfo, LogEst nRowEst){
 */
 static SQLITE_NOINLINE void whereInterstageHeuristic(WhereInfo *pWInfo){
   int i;
+#ifdef WHERETRACE_ENABLED
+  int once = 0;
+#endif
   for(i=0; i<pWInfo->nLevel; i++){
     WhereLoop *p = pWInfo->a[i].pWLoop;
     if( p==0 ) break;
@@ -4536,7 +4539,19 @@ static SQLITE_NOINLINE void whereInterstageHeuristic(WhereInfo *pWInfo){
       WhereLoop *pLoop;
       for(pLoop=pWInfo->pLoops; pLoop; pLoop=pLoop->pNextLoop){
         if( pLoop->iTab!=iTab ) continue;
-        if( (pLoop->wsFlags & WHERE_CONSTRAINT)!=0 ) continue;
+        if( (pLoop->wsFlags & (WHERE_CONSTRAINT|WHERE_AUTO_INDEX))!=0 ){
+          /* Auto-index and index-constrained loops allowed to remain */
+          continue;
+        }
+#ifdef WHERETRACE_ENABLED
+        if( sqlite3WhereTrace & 0x80 ){
+          if( once==0 ){
+            sqlite3DebugPrintf("Loops disabled by interstage heuristic:\n");
+            once = 1;
+          }
+          whereLoopPrint(pLoop, &pWInfo->sWC);
+        }
+#endif /* WHERETRACE_ENABLED */
         pLoop->prereq = ALLBITS;  /* Prevent 2nd solver() from using this one */
       }
     }else{
diff --git a/test/whereN.test b/test/whereN.test
index b9b889fa28..722c4f8ea9 100644
--- a/test/whereN.test
+++ b/test/whereN.test
@@ -76,7 +76,7 @@ do_execsql_test 1.0 {
     ('violation','v1','376661 28974 1'),
     ('rule','rule2','24 12 1'),
     ('datasource','ds1','3 1 1');
-  ANALYZE sqlite_schema;
+  ANALYZE sqlite_master;
 }
 set DSNAME ds-two   ;#  Only a few rows.  Change to "ds-one" for many rows.
 do_eqp_test 1.1 {
@@ -90,12 +90,12 @@ do_eqp_test 1.1 {
   );
 } {
   QUERY PLAN
-  |--CO-ROUTINE (subquery-xxxxxx)
-  |  |--SEARCH DS USING COVERING INDEX ds1 (name=?)
-  |  |--SEARCH R USING COVERING INDEX rule2 (dsid=?)
-  |  |--SEARCH V USING INDEX v1 (rid=?)
+  |--CO-ROUTINE xxxxxx
+  |  |--SEARCH TABLE datasource AS DS USING COVERING INDEX ds1 (name=?)
+  |  |--SEARCH TABLE rule AS R USING COVERING INDEX rule2 (dsid=?)
+  |  |--SEARCH TABLE violation AS V USING INDEX v1 (rid=?)
   |  `--USE TEMP B-TREE FOR ORDER BY
-  `--SCAN (subquery-xxxxxx)
+  `--SCAN SUBQUERY xxxxxx
 }
 #       ^^^^---- We want to see three SEARCH terms.  No SCAN terms.
 #                The ORDER BY is implemented by a separate sorter pass.