diff --git a/manifest b/manifest
index b037731f09..823653ac7d 100644
--- a/manifest
+++ b/manifest
@@ -1,5 +1,5 @@
-C The\strunk\sassumes\sthat\san\sopen\srange\sconstraint\son\san\sindexed\sterm\s(col>?)\sterm\smatches\s1/4\sof\sthe\sindexed\srows,\sand\sthat\sa\sclosed\sconstraint\s(col\sBETWEEN\s?\sAND\s?)\smatches\s1/64.\sChange\sthis\sbranch\sto\sdo\sthe\ssame.
-D 2014-04-28T19:34:06.281
+C Do\snot\sreduce\sthe\snumber\sof\srows\sscanned\sat\sall\sfor\s"IS\sNOT\sNULL"\sconstraints.\sFix\sa\sbug\sin\scalculating\sthe\snumber\sof\srows\svisited\sby\sscans\sof\spartial\sindicies.
+D 2014-04-28T20:11:20.674
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 2ef13430cd359f7b361bb863504e227b25cc7f81
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -291,7 +291,7 @@ F src/vtab.c 21b932841e51ebd7d075e2d0ad1415dce8d2d5fd
 F src/wal.c 76e7fc6de229bea8b30bb2539110f03a494dc3a8
 F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
 F src/walker.c 11edb74d587bc87b33ca96a5173e3ec1b8389e45
-F src/where.c 0a518940065c10ad8dedf8f2d6e73f1e14eb8472
+F src/where.c da9c2c1d0c2ecf51ea3b7a27c826999972f24086
 F src/whereInt.h 6804c2e5010378568c2bb1350477537755296a46
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/aggerror.test a867e273ef9e3d7919f03ef4f0e8c0d2767944f2
@@ -406,7 +406,7 @@ F test/corruptF.test be9fde98e4c93648f1ba52b74e5318edc8f59fe4
 F test/corruptG.test 1ab3bf97ee7bdba70e0ff3ba2320657df55d1804
 F test/corruptH.test 88ed71a086e13591c917aac6de32750e7c7281cb
 F test/corruptI.test b3e4203d420490fc3d3062711597bc1dea06a789
-F test/cost.test 39d014a90b67169f8482ede8713bff694761d879
+F test/cost.test 84473f27749e0f3b6837a8e1403967010c347ca5
 F test/count.test 42a251178e32f617eda33f76236a7f79825a50b5
 F test/coveridxscan.test cdb47d01acc4a634a34fd25abe85189e0d0f1e62
 F test/crash.test fb9dc4a02dcba30d4aa5c2c226f98b220b2b959f
@@ -611,7 +611,7 @@ F test/index2.test ee83c6b5e3173a3d7137140d945d9a5d4fdfb9d6
 F test/index3.test 55a90cff99834305e8141df7afaef39674b57062
 F test/index4.test ab92e736d5946840236cd61ac3191f91a7856bf6
 F test/index5.test fc07c14193c0430814e7a08b5da46888ee795c33
-F test/index6.test a0a2d286ffa6d35813f5003fdb7be124825b4422
+F test/index6.test fb370966ac3cd0989053dd5385757b5c3e24ab6a
 F test/index7.test a3baf9a625bda7fd49471e99aeae04095fbfeecf
 F test/indexedby.test b2f22f3e693a53813aa3f50b812eb609ba6df1ec
 F test/indexfault.test 31d4ab9a7d2f6e9616933eb079722362a883eb1d
@@ -1162,7 +1162,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
 F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
-P 20f468dfbcb247e51446fad411a6e6cc0d130411
-R eabc843f8d46cb0d3b0b7dd8faf4ef00
+P 4047ac75e2a8f0b330255501c42e4f04e5ab500d
+R fc72ae401d0e8a316c9dd5e0ec98069f
 U dan
-Z 37bdf577e72e4cd110b1edb4853d30e0
+Z f6f096240da2e8d5cf26af9c9310dce5
diff --git a/manifest.uuid b/manifest.uuid
index 405d43fc27..99d11f9b9b 100644
--- a/manifest.uuid
+++ b/manifest.uuid
@@ -1 +1 @@
-4047ac75e2a8f0b330255501c42e4f04e5ab500d
\ No newline at end of file
+a8ae93f0cffa116df0ba34d46a53f49d42dace41
\ No newline at end of file
diff --git a/src/where.c b/src/where.c
index 4b2eef9c52..8abe6bd1a1 100644
--- a/src/where.c
+++ b/src/where.c
@@ -1992,9 +1992,7 @@ static LogEst whereRangeAdjust(WhereTerm *pTerm, LogEst nNew){
   if( pTerm ){
     if( pTerm->truthProb<=0 ){
       nRet += pTerm->truthProb;
-    }else if( pTerm->wtFlags & TERM_VNULL ){
-      nRet -= 10;        assert( 10==sqlite3LogEst(2) );
-    }else{
+    }else if( (pTerm->wtFlags & TERM_VNULL)==0 ){
       nRet -= 20;        assert( 20==sqlite3LogEst(4) );
     }
   }
@@ -2153,14 +2151,17 @@ static int whereRangeScanEst(
   UNUSED_PARAMETER(pBuilder);
 #endif
   assert( pLower || pUpper );
+  assert( pUpper==0 || (pUpper->wtFlags & TERM_VNULL)==0 );
   nNew = whereRangeAdjust(pLower, nOut);
   nNew = whereRangeAdjust(pUpper, nNew);
+
   /* TUNING: If there is both an upper and lower limit, assume the range is
   ** reduced by an additional 75%. This means that, by default, an open-ended
   ** range query (e.g. col > ?) is assumed to match 1/4 of the rows in the
   ** index. While a closed range (e.g. col BETWEEN ? AND ?) is estimated to
   ** match 1/64 of the index. */ 
   if( pLower && pUpper ) nNew -= 20;
+
   nOut -= (pLower!=0) + (pUpper!=0);
   if( nNew<10 ) nNew = 10;
   if( nNew<nOut ) nOut = nNew;
@@ -4446,6 +4447,7 @@ static int whereLoopAddBtree(
      && !whereUsablePartialIndex(pNew->iTab, pWC, pProbe->pPartIdxWhere) ){
       continue;  /* Partial index inappropriate for this query */
     }
+    rSize = pProbe->aiRowLogEst[0];
     pNew->u.btree.nEq = 0;
     pNew->u.btree.nSkip = 0;
     pNew->nLTerm = 0;
diff --git a/test/cost.test b/test/cost.test
index faaa7bdf16..0f9314fc8e 100644
--- a/test/cost.test
+++ b/test/cost.test
@@ -89,6 +89,101 @@ do_eqp_test 4.3 {
 }
 
 
+#-------------------------------------------------------------------------
+#
+reset_db
+do_execsql_test 5.1 {
+  CREATE TABLE t2(x, y);
+  CREATE INDEX t2i1 ON t2(x);
+}
+
+do_eqp_test 5.2 {
+  SELECT * FROM t2 ORDER BY x, y;
+} {}
+#exit
+
+# TODO: Check this one out!!
+# set sqlite_where_trace 0xfff
+do_eqp_test 5.3 {
+  SELECT * FROM t2 WHERE x BETWEEN ? AND ? ORDER BY rowid;
+} {}
+#exit
+
+# where7.test, where8.test:
+#
+do_execsql_test 6.1 {
+  CREATE TABLE t3(a INTEGER PRIMARY KEY, b, c);
+  CREATE INDEX t3i1 ON t3(b);
+  CREATE INDEX t3i2 ON t3(c);
+}
+
+#set sqlite_where_trace 0xfff
+# eqp.test
+do_eqp_test 6.2 {
+  SELECT a FROM t3 WHERE (b BETWEEN 2 AND 4) OR c=100 ORDER BY a
+} {
+}
+
+#-------------------------------------------------------------------------
+#
+reset_db
+do_execsql_test 7.1 {
+  CREATE TABLE t1(a INTEGER PRIMARY KEY,b,c,d,e,f,g);
+  CREATE INDEX t1b ON t1(b);
+  CREATE INDEX t1c ON t1(c);
+  CREATE INDEX t1d ON t1(d);
+  CREATE INDEX t1e ON t1(e);
+  CREATE INDEX t1f ON t1(f);
+  CREATE INDEX t1g ON t1(g);
+}
+
+do_eqp_test 7.2 {
+  SELECT a FROM t1
+     WHERE (b>=950 AND b<=1010) OR (b IS NULL AND c NOT NULL)
+  ORDER BY a
+} {
+}
+
+#set sqlite_where_trace 0xfff
+do_eqp_test 7.3 {
+  SELECT rowid FROM t1
+  WHERE (+b IS NULL AND c NOT NULL AND d NOT NULL)
+        OR (b NOT NULL AND c IS NULL AND d NOT NULL)
+        OR (b NOT NULL AND c NOT NULL AND d IS NULL)
+} {}
+#exit
+
+#-------------------------------------------------------------------------
+#
+reset_db
+do_execsql_test 8.1 {
+  CREATE TABLE composer(
+    cid INTEGER PRIMARY KEY,
+    cname TEXT
+  );
+  CREATE TABLE album(
+    aid INTEGER PRIMARY KEY,
+    aname TEXT
+  );
+  CREATE TABLE track(
+    tid INTEGER PRIMARY KEY,
+    cid INTEGER REFERENCES composer,
+    aid INTEGER REFERENCES album,
+    title TEXT
+  );
+  CREATE INDEX track_i1 ON track(cid);
+  CREATE INDEX track_i2 ON track(aid);
+}
+
+do_eqp_test 8.2 {
+  SELECT DISTINCT aname
+    FROM album, composer, track
+   WHERE cname LIKE '%bach%'
+     AND unlikely(composer.cid=track.cid)
+     AND unlikely(album.aid=track.aid);
+} {
+}
+
 finish_test
 
 
diff --git a/test/index6.test b/test/index6.test
index 3451e5c1df..68bdd06c14 100644
--- a/test/index6.test
+++ b/test/index6.test
@@ -145,11 +145,11 @@ do_test index6-2.1 {
   execsql {
     CREATE TABLE t2(a,b);
     INSERT INTO t2(a,b) SELECT value, value FROM nums WHERE value<1000;
-    UPDATE t2 SET a=NULL WHERE b%5==0;
+    UPDATE t2 SET a=NULL WHERE b%2==0;
     CREATE INDEX t2a1 ON t2(a) WHERE a IS NOT NULL;
     SELECT count(*) FROM t2 WHERE a IS NOT NULL;
   }
-} {800}
+} {500}
 do_test index6-2.2 {
   execsql {
     EXPLAIN QUERY PLAN
@@ -157,6 +157,7 @@ do_test index6-2.2 {
   }
 } {/.* TABLE t2 USING INDEX t2a1 .*/}
 ifcapable stat4||stat3 {
+  execsql ANALYZE
   do_test index6-2.3stat4 {
     execsql {
       EXPLAIN QUERY PLAN