Ensure the join flags on the parent are set correctly when flattening UNION ALL sub-queries that include branches with RIGHT joins. Report [bugs:/info/2026-10-08T15:27:33Z | 2026-10-08T15:27:33Z].

FossilOrigin-Name: cfa69ea48a7aa379ee0c30ae81d2802da862d610f829c933e5eb358c23fc2b9d

manifest

@@ -1,5 +1,5 @@
-C Disable\sthe\s"expr\sIN\s(const)"\sto\s"expr=const"\soptimization\sof\s"const"\shas\na\sCOLLATE\sclause,\sas\susing\sthe\scollating\son\s"="\swould\sgive\sthe\swrong\sanswer.\n[bugs:/info/2026-10-08T12:36:41Z|Bugs\s2026-10-08T12:36:41Z]
-D 2026-10-08T19:06:55.671
+C Ensure\sthe\sjoin\sflags\son\sthe\sparent\sare\sset\scorrectly\swhen\sflattening\sUNION\sALL\ssub-queries\sthat\sinclude\sbranches\swith\sRIGHT\sjoins.\sReport\s[bugs:/info/2026-10-08T15:27:33Z\s|\s2026-10-08T15:27:33Z].
+D 2026-10-08T19:34:24.937
 F .fossil-settings/binary-glob 61195414528fb3ea9693577e1980230d78a1f8b0a54c78cf1b9b24d0a409ed6a x
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
@@ -801,7 +801,7 @@ F src/printf.c 4bd228ed9e9346d558362be562757ee5eef6f9bf483b7f02751ca42cf95174d3
 F src/random.c 606b00941a1d7dd09c381d3279a058d771f406c5213c9932bbd93d5587be4b9c
 F src/resolve.c 0e0990f60c93db38c735d85e5d1741130e72dd0670aec204b5a39118b53c8044
 F src/rowset.c 8432130e6c344b3401a8874c3cb49fefe6873fec593294de077afea2dce5ec97
-F src/select.c 8d2e31c0a88c30aabea7acc5a5e1e20ae24481d55e9fb187d53313d3080e3fcf
+F src/select.c f6ad8bbf82f21a32c68ce3d885f1a960469d48efde93f432f5ba680869ae64f6
 F src/shell.c.in fbcaa24ae9fccd177e0fe5e19f9161babb47b8a0b27a9b7fd3df18b855abd3bb
 F src/sqlite.h.in 884996e07cfb7681efc76661b79d56a93f9edaea7f6fc4a3c82636dc84783486
 F src/sqlite3.rc 015537e6ac1eec6c7050e17b616c2ffe6f70fca241835a84a4f0d5937383c479
@@ -1995,7 +1995,7 @@ F test/types2.test 1aeb81976841a91eef292723649b5c4fe3bc3cac
 F test/types3.test c60e89c4d6babe44b23a2ea0090f3044e549403b20648b1c6bb65a69fea5f1ed
 F test/unhex.test b7f1b806207cb77fa31c3e434fe92fba524464e3e9356809bfcc28f15af1a8b7
 F test/unionall.test 04d30726c5056f84f92b3a12bf8d8a1dbbe807d1ddc8af95def09e6ef2dd91e3
-F test/unionall2.test 71e8fa08d5699d50dc9f9dc0c9799c2e7a6bb7931a330d369307a4df7f157fa1
+F test/unionall2.test 144d4ba2da748e798eba64f109be3c69bbf35a74454c6d4db3176a4967df29a8
 F test/unionallfault.test 652bfbb630e6c43135965dc1e8f0a9a791da83aec885d626a632fe1909c56f73
 F test/unionvtab.test bc8f1d5807583dfc9b715da0d570766528fb5a878b0620e23af32a6b55cb437e
 F test/unionvtabfault.test e8759f3d14fb938ce9657e2342db34aeac0fb9bc1692b0d1ebb0069630151d06
@@ -2281,8 +2281,8 @@ F tool/warnings-clang.sh bbf6a1e685e534c92ec2bfba5b1745f34fb6f0bc2a362850723a9ee
 F tool/warnings.sh a554d13f6e5cf3760f041b87939e3d616ec6961859c3245e8ef701d1eafc2ca2
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
 F tool/winmain.c 00c8fb88e365c9017db14c73d3c78af62194d9644feaf60e220ab0f411f3604c
-P 028a92f9c353d3b400551954de2e09c1723076491f79ff767dd24b452654fda8
-R 01bba7e315445b9e0a0e452f1c130807
-U drh
-Z de0d1b2577c59af484e25d183db4f870
+P 53a73aa03d05350ebee81c3d2aef85744c8ebeda72f565083dc4b472b57c5499
+R fe57bd6c375f6e4dbf22be18e69cde3c
+U dan
+Z 6d721ddda04882419ca5fd3bd8136924
 # Remove this line to create a well-formed Fossil manifest.

manifest.uuid

@@ -1 +1 @@
-53a73aa03d05350ebee81c3d2aef85744c8ebeda72f565083dc4b472b57c5499
+cfa69ea48a7aa379ee0c30ae81d2802da862d610f829c933e5eb358c23fc2b9d

src/select.c

@@ -4671,7 +4671,7 @@ static int flattenSubquery(
   pSub = pSub1;
   for(pParent=p; pParent; pParent=pParent->pPrior, pSub=pSub->pPrior){
     int nSubSrc;
-    u8 jointype = pSubitem->fg.jointype;
+    u8 jointype = pParent->pSrc->a[iFrom].fg.jointype;
     assert( pSub!=0 );
     pSubSrc = pSub->pSrc;     /* FROM clause of subquery */
     nSubSrc = pSubSrc->nSrc;  /* Number of terms in subquery FROM clause */
@@ -4696,7 +4696,6 @@ static int flattenSubquery(
       pSrc = sqlite3SrcListEnlarge(pParse, pSrc, nSubSrc-1,iFrom+1);
       if( pSrc==0 ) break;
       pParent->pSrc = pSrc;
-      pSubitem = &pSrc->a[iFrom];
     }
 
     /* Transfer the FROM clause terms from the subquery into the
@@ -4714,7 +4713,7 @@ static int flattenSubquery(
       pItem->fg.jointype |= (jointype & JT_LTORJ);
       memset(&pSubSrc->a[i], 0, sizeof(pSubSrc->a[i]));
     }
-    pSubitem->fg.jointype |= jointype;
+    pSrc->a[iFrom].fg.jointype |= jointype;
  
     /* Begin substituting subquery result set expressions for
     ** references to the iParent in the outer query.

test/unionall2.test

@@ -53,6 +53,67 @@ do_execsql_test 2.2 {
   )
 }
 
+#-------------------------------------------------------------------------
+# https://sqlite.org/bugs/forumpost/b6e0cf3df3
+#
+reset_db
+
+do_execsql_test 3.0 {
+  CREATE TABLE t0(c0);
+  CREATE TABLE t1(c0);
+  INSERT INTO t0 VALUES (NULL);
+}
+
+do_execsql_test 3.1 {
+  SELECT 5 FROM t0 WHERE (SELECT 0) 
+  UNION ALL 
+  SELECT 7 FROM t1 RIGHT JOIN t0 ON 0
+} 7
+
+do_execsql_test 3.2 {
+  SELECT * FROM (
+    SELECT 5 FROM t0 WHERE (SELECT 0) 
+    UNION ALL 
+    SELECT 7 FROM t1 RIGHT JOIN t0 ON 0
+  );
+} {7}
+
+do_execsql_test 3.3 {
+  SELECT * FROM (
+    SELECT c0 FROM t0 
+    UNION ALL 
+    SELECT a.c0 FROM t0 AS a RIGHT JOIN t0 AS b ON 0
+  )
+} {{} {}}
+
+do_execsql_test 3.4 {
+  SELECT * FROM (
+    SELECT c0 FROM t0 
+    UNION ALL 
+    SELECT a.c0 FROM t0 AS a RIGHT JOIN t0 AS b ON 0
+  ) WHERE abs(c0)
+} {}
+
+do_execsql_test 3.5 {
+  CREATE TABLE t2(a, x);  CREATE INDEX t2x ON t2(x);
+  CREATE TABLE t3(b, y);  CREATE INDEX t3y ON t3(y);
+  CREATE TABLE t4(c, d);  CREATE INDEX t4d ON t4(d);
+}
+
+do_eqp_test 3.6 {
+  SELECT * FROM t4 CROSS JOIN (
+    SELECT a, x FROM t2 UNION ALL SELECT b, y FROM t3
+  ) AS s WHERE s.a=t4.d AND s.x=5;
+} {
+  QUERY PLAN
+  `--COMPOUND QUERY
+     |--LEFT-MOST SUBQUERY
+     |  |--SCAN t4
+     |  `--SEARCH t2 USING INDEX t2x (x=?)
+     `--UNION ALL
+        |--SCAN t4
+        `--SEARCH t3 USING INDEX t3y (y=?)
+}
 
 
 finish_test