diff --git a/manifest b/manifest
index eb4d3a80ec..8e721c34a6 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C Remove\ssome\sdead\sWASM-side\scode.
-D 2024-04-23T06:49:47.154
+C Fix\sa\sproblem\swith\svector\sIN\soperators\sused\swith\san\sindex\swhere\sthe\saffinities\nand\scollations\sfor\sthe\svarious\svector\sterms\sare\sdifferent.
+D 2024-04-23T12:02:03.384
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F LICENSE.md df5091916dbb40e6e9686186587125e1b2ff51f022cc334e886c19a0e9982724
@@ -836,7 +836,7 @@ F src/vxworks.h d2988f4e5a61a4dfe82c6524dd3d6e4f2ce3cdb9
 F src/wal.c 887fc4ca3f020ebb2e376f222069570834ac63bf50111ef0cbf3ae417048ed89
 F src/wal.h ba252daaa94f889f4b2c17c027e823d9be47ce39da1d3799886bbd51f0490452
 F src/walker.c 7c7ea0115345851c3da4e04e2e239a29983b61fb5b038b94eede6aba462640e2
-F src/where.c c6c14735091b8716763c05fb8db8b32907f4edca96ba0095bff892fbaba7f0e9
+F src/where.c 447d8761632fb0a18b03077161415d9713cbd0a81bf34a35cee63480e5c401c5
 F src/whereInt.h 82a13766f13d1a53b05387c2e60726289ef26404bc7b9b1f7770204d97357fb8
 F src/wherecode.c 1f6940349e92a6e056aecd70163b00f331554c815c362b4cc80906c48151d73d
 F src/whereexpr.c 7b64295f1d82ad0928df435925dd7bbd5997b44a026153113eace0d9e71ff435
@@ -1275,7 +1275,7 @@ F test/in.test d1cad4ededd425568b2e39fb0c31fa9a3772311dd595801ff13ba3912b69bba6
 F test/in2.test 5d4c61d17493c832f7d2d32bef785119e87bde75
 F test/in3.test 3cbf58c87f4052cee3a58b37b6389777505aa0c0
 F test/in4.test bb767ec1cfd1730256f0a83219f0acda36bc251b63f8b8bb7d8c7cff17875a4f
-F test/in5.test b32ce7f4a93f44c5dee94af16886d922cc16ebe33c8e1765c73d4049d0f4b40f
+F test/in5.test 4fd79c70dfa0681313e8cdca07f5ff0400bdc0e20f808a5c59eaef1e4b48082a
 F test/in6.test f5f40d6816a8bb7c784424b58a10ac38efb76ab29127a2c17399e0cbeeda0e4b
 F test/incrblob.test c9b96afc292aeff43d6687bcb09b0280aa599822
 F test/incrblob2.test a494c9e848560039a23974b9119cfc2cf3ad3bd15cc2694ee6367ae537ef8f1f
@@ -2185,8 +2185,9 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P 9e7fc9370dfca121244f7a2941e8de629b277f1799f8de08a43ff1d86f94b6f5
-R b231e37736ffdee257e51342c04cf6fd
-U stephan
-Z cab669345b54790908300b069b7a8aa6
+P 0a07ee27bd6021a6fc1d81133012592351530ffcf6ae09322ea74624cff910df 85625b38718c6e4cf7aa97fa3c52153bd25c810b68f19e7924e1f4b709c6a05d
+R c4a23a5323086d7b4821fb61d859ea24
+T +closed 85625b38718c6e4cf7aa97fa3c52153bd25c810b68f19e7924e1f4b709c6a05d
+U drh
+Z ae5e767d94a1a535bc8f32beb80ed40d
 # Remove this line to create a well-formed Fossil manifest.
diff --git a/manifest.uuid b/manifest.uuid
index 77e13a296a..d3da69e9df 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-0a07ee27bd6021a6fc1d81133012592351530ffcf6ae09322ea74624cff910df
\ No newline at end of file
+86e8c782e7494377de3c27b750cd83a7eb2302c1182ee2004d3864db50fca557
\ No newline at end of file
diff --git a/src/where.c b/src/where.c
index 95bea115d1..39210ddb28 100644
--- a/src/where.c
+++ b/src/where.c
@@ -302,6 +302,42 @@ static Expr *whereRightSubexprIsColumn(Expr *p){
   return 0;
 }
 
+/*
+** Term pTerm is guaranteed to be a WO_IN term. It may be a component term
+** of a vector IN expression of the form "(x, y, ...) IN (SELECT ...)".
+** This function checks to see if the term is compatible with an index
+** column with affinity idxaff (one of the SQLITE_AFF_XYZ values). If so,
+** it returns a pointer to the name of the collation sequence (e.g. "BINARY"
+** or "NOCASE") used by the comparison in pTerm. If it is not compatible
+** with affinity idxaff, NULL is returned.
+*/
+static SQLITE_NOINLINE const char *indexInAffinityOk(
+  Parse *pParse, 
+  WhereTerm *pTerm, 
+  u8 idxaff
+){
+  Expr *pX = pTerm->pExpr;
+  Expr inexpr;
+
+  assert( pTerm->eOperator & WO_IN );
+
+  if( sqlite3ExprIsVector(pX->pLeft) ){
+    int iField = pTerm->u.x.iField - 1;
+    inexpr.flags = 0;
+    inexpr.op = TK_EQ;
+    inexpr.pLeft = pX->pLeft->x.pList->a[iField].pExpr;
+    assert( ExprUseXSelect(pX) );
+    inexpr.pRight = pX->x.pSelect->pEList->a[iField].pExpr;
+    pX = &inexpr;
+  }
+
+  if( sqlite3IndexAffinityOk(pX, idxaff) ){
+    CollSeq *pRet = sqlite3ExprCompareCollSeq(pParse, pX);
+    return pRet ? pRet->zName : sqlite3StrBINARY;
+  }
+  return 0;
+}
+
 /*
 ** Advance to the next WhereTerm that matches according to the criteria
 ** established when the pScan object was initialized by whereScanInit().
@@ -352,16 +388,24 @@ static WhereTerm *whereScanNext(WhereScan *pScan){
           if( (pTerm->eOperator & pScan->opMask)!=0 ){
             /* Verify the affinity and collating sequence match */
             if( pScan->zCollName && (pTerm->eOperator & WO_ISNULL)==0 ){
-              CollSeq *pColl;
+              const char *zCollName;
               Parse *pParse = pWC->pWInfo->pParse;
               pX = pTerm->pExpr;
-              if( !sqlite3IndexAffinityOk(pX, pScan->idxaff) ){
-                continue;
+
+              if( (pTerm->eOperator & WO_IN) ){
+                zCollName = indexInAffinityOk(pParse, pTerm, pScan->idxaff);
+                if( !zCollName ) continue;
+              }else{
+                CollSeq *pColl;
+                if( !sqlite3IndexAffinityOk(pX, pScan->idxaff) ){
+                  continue;
+                }
+                assert(pX->pLeft);
+                pColl = sqlite3ExprCompareCollSeq(pParse, pX);
+                zCollName = pColl ? pColl->zName : sqlite3StrBINARY;
               }
-              assert(pX->pLeft);
-              pColl = sqlite3ExprCompareCollSeq(pParse, pX);
-              if( pColl==0 ) pColl = pParse->db->pDfltColl;
-              if( sqlite3StrICmp(pColl->zName, pScan->zCollName) ){
+
+              if( sqlite3StrICmp(zCollName, pScan->zCollName) ){
                 continue;
               }
             }
diff --git a/test/in5.test b/test/in5.test
index 6680641ff3..933eb90026 100644
--- a/test/in5.test
+++ b/test/in5.test
@@ -266,4 +266,26 @@ do_execsql_test 9.2 {
   SELECT lower('1e500') FROM t0 WHERE rowid != lower('1e500');
 } {1e500}
 
+#-------------------------------------------------------------------------
+#
+reset_db
+
+do_execsql_test 10.0 {
+  CREATE TABLE t1(a, b TEXT COLLATE NOCASE);
+  INSERT INTO t1 VALUES('abc', 'def');
+  INSERT INTO t1 VALUES('ghi', 'jkl');
+}
+
+do_execsql_test 10.1 {
+  SELECT rowid FROM t1 WHERE (a, b) IN ( VALUES('abc', 'def'), ('ghi', 'JKL') );
+} {1 2}
+
+do_execsql_test 10.2 {
+  CREATE INDEX i1 ON t1(a, b COLLATE BINARY);
+}
+
+do_execsql_test 10.3 {
+  SELECT rowid FROM t1 WHERE (a, b) IN ( VALUES('abc', 'def'), ('ghi', 'JKL') );
+} {1 2}
+
 finish_test