diff --git a/manifest b/manifest
index 8332621247..a7604adb25 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C In\sthe\sWHERE-constraint\spropagation\soptimization,\sif\sthere\sare\sduplicate\nconstraint,\smake\ssure\sonly\sone\sof\sthem\spropagates.\s\sProposed\sfix\sfor\nticket\s[cf5ed20fc8621b165].
-D 2018-10-25T14:15:37.103
+C Prevent\san\s==\sconstraint\sspecified\susing\sthe\stable-valued-function\sargument\nsyntax\sfrom\sbeing\sused\sto\soptimize\sany\sscan\snot\srelated\sto\sthe\svirtual\stable\nfor\swhich\sit\swas\sspecified\sas\san\sargument.
+D 2018-10-26T15:36:53.982
 F .fossil-settings/empty-dirs dbb81e8fc0401ac46a1491ab34a7f2c7c0452f2f06b54ebb845d024ca8283ef1
 F .fossil-settings/ignore-glob 35175cdfcf539b2318cb04a9901442804be81cd677d8b889fcc9149c21f239ea
 F Makefile.in 01e95208a78b57d056131382c493c963518f36da4c42b12a97eb324401b3a334
@@ -592,7 +592,7 @@ F src/walker.c fb94aadc9099ff9c6506d0a8b88d51266005bcaa265403f3d7caf732a562eb66
 F src/where.c a54a3d639bcd751d1474deff58e239b2e475a96e1b8f9178aa7864df8782a4e3
 F src/whereInt.h f125f29fca80890768e0b2caa14f95db74b2dacd3a122a168f97aa7b64d6968f
 F src/wherecode.c 3df0a541373d5f999684d761e4bd700d57adb46c7d39da4e77b767b5adcd5893
-F src/whereexpr.c 1b5a5a7876997f65232bbf19c5c1eeb47eb328b8fa5b28c865543052904cde00
+F src/whereexpr.c 7660a5845113f05f60fa615aed40047a058587a36b70a7b0c28b74253a19ffa1
 F src/window.c 6550e2850ebced51100ef83d49b00a1cf03f81a482dafedafb0320df647ed8fc
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
@@ -669,7 +669,7 @@ F test/bc_common.tcl b5e42d80305be95697e6370e015af571e5333a1c
 F test/bestindex1.test 852170bddbb21daa121fabcc274640ff83d7d8705912e8b5fe7ed2c5a9a9224a
 F test/bestindex2.test 9a0ccd320b6525eec3a706aae6cdab7e1b7b5abca75027e39f39f755e76e5928
 F test/bestindex3.test 001788a114ad96d81d5154fe77c7f1e26e84b3a2b5635ca29e4f96f6decc534e
-F test/bestindex4.test 4cb5ff7dbaebadb87d366f51969271778423b455
+F test/bestindex4.test 210eac9323ef88881212d6ae90c84dad86ec14d82c6f4fc9a9ee24c76a8f2014
 F test/bestindex5.test 412b42f8036b28d8b2f3534d89389ad946a4b1a65a12263f51936f7424296f1b
 F test/bestindex6.test d856a9bb63d927493575823eed44053bc36251e241aa364e54d0f2a2d302e1d4
 F test/between.test 34d375fb5ce1ae283ffe82b6b233e9f38e84fc6c
@@ -1772,7 +1772,7 @@ F vsixtest/vsixtest.tcl 6a9a6ab600c25a91a7acc6293828957a386a8a93
 F vsixtest/vsixtest.vcxproj.data 2ed517e100c66dc455b492e1a33350c1b20fbcdc
 F vsixtest/vsixtest.vcxproj.filters 37e51ffedcdb064aad6ff33b6148725226cd608e
 F vsixtest/vsixtest_TemporaryKey.pfx e5b1b036facdb453873e7084e1cae9102ccc67a0
-P de940296d227c96db4d0cf913fc5c0e5138729eda7cda0a0ac6b704cce1e1e1e
-R d5acc9d026bd9c265f6de052be0f92d3
-U drh
-Z 4bc6cbb9e4f3ab72bb6d01ca2996d24a
+P 5d5b596f152bb2781011a05f75f9e200774d4f69d648ef68de577b4ace973e07
+R 8af441be159a5306c3bcc729f277a8dc
+U dan
+Z 7280881af13a5758968cff92a52a3f86
diff --git a/manifest.uuid b/manifest.uuid
index 802efe5c70..59f3e0c5b9 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-5d5b596f152bb2781011a05f75f9e200774d4f69d648ef68de577b4ace973e07
\ No newline at end of file
+4d46685f282409f7154be288719cbea4b743d7ea5315a55a91462003497469f7
\ No newline at end of file
diff --git a/src/whereexpr.c b/src/whereexpr.c
index 8f3791e798..c69d7fe581 100644
--- a/src/whereexpr.c
+++ b/src/whereexpr.c
@@ -1573,6 +1573,7 @@ void sqlite3WhereTabFuncArgs(
   pArgs = pItem->u1.pFuncArg;
   if( pArgs==0 ) return;
   for(j=k=0; j<pArgs->nExpr; j++){
+    Expr *pRhs;
     while( k<pTab->nCol && (pTab->aCol[k].colFlags & COLFLAG_HIDDEN)==0 ){k++;}
     if( k>=pTab->nCol ){
       sqlite3ErrorMsg(pParse, "too many arguments on %s() - max %d",
@@ -1584,8 +1585,9 @@ void sqlite3WhereTabFuncArgs(
     pColRef->iTable = pItem->iCursor;
     pColRef->iColumn = k++;
     pColRef->y.pTab = pTab;
-    pTerm = sqlite3PExpr(pParse, TK_EQ, pColRef,
-                         sqlite3ExprDup(pParse->db, pArgs->a[j].pExpr, 0));
+    pRhs = sqlite3PExpr(pParse, TK_UPLUS, 
+        sqlite3ExprDup(pParse->db, pArgs->a[j].pExpr, 0), 0);
+    pTerm = sqlite3PExpr(pParse, TK_EQ, pColRef, pRhs);
     whereClauseInsert(pWC, pTerm, TERM_DYNAMIC);
   }
 }
diff --git a/test/bestindex4.test b/test/bestindex4.test
index 64727bd0d7..9a92625c4a 100644
--- a/test/bestindex4.test
+++ b/test/bestindex4.test
@@ -117,4 +117,57 @@ for {set param1 0} {$param1<16} {incr param1} {
   }
 }
 
+#-------------------------------------------------------------------------
+# Test that a parameter passed to a table-valued function cannot be
+# used to drive an index. i.e. that in the following:
+#
+#   SELECT * FROM tbl, vtab(tbl.x);
+#
+# The implicit constraint "tbl.x = vtab.hidden" is not optimized using
+# an index on tbl.x.
+#
+reset_db
+register_tcl_module db
+proc vtab_command {method args} {
+  switch -- $method {
+    xConnect {
+      return "CREATE TABLE t1(a, b, c, d HIDDEN)"
+    }
+
+    xBestIndex {
+      set clist [lindex $args 0]
+      if {[llength $clist]!=1} { error "unexpected constraint list" }
+      catch { array unset C }
+      array set C [lindex $clist 0]
+      if {$C(usable)} {
+        return [list omit 0 idxnum 555 rows 10 cost 100]
+      }
+      return [list cost 100000000]
+    }
+
+  }
+
+  return {}
+}
+
+do_execsql_test 2.0 {
+  CREATE VIRTUAL TABLE x1 USING tcl(vtab_command);
+  CREATE TABLE t1 (x INT PRIMARY KEY);
+} {}
+
+do_execsql_test 2.1 {
+  EXPLAIN QUERY PLAN SELECT * FROM t1, x1 WHERE x1.d=t1.x;
+} {
+  3 0 0 {SCAN TABLE x1 VIRTUAL TABLE INDEX 0:}
+  7 0 0 {SEARCH TABLE t1 USING COVERING INDEX sqlite_autoindex_t1_1 (x=?)}
+}
+
+do_execsql_test 2.2 {
+  EXPLAIN QUERY PLAN SELECT * FROM t1, x1(t1.x)
+} {
+  3 0 0 {SCAN TABLE t1} 
+  5 0 0 {SCAN TABLE x1 VIRTUAL TABLE INDEX 555:}
+}
+
+
 finish_test