Index: src/where.c
==================================================================
--- src/where.c
+++ src/where.c
@@ -4711,11 +4711,12 @@
 
   /* Loop over all indices
   */
   for(; rc==SQLITE_OK && pProbe; pProbe=pProbe->pNext, iSortIdx++){
     if( pProbe->pPartIdxWhere!=0
-     && !whereUsablePartialIndex(pNew->iTab, pWC, pProbe->pPartIdxWhere) ){
+     && !whereUsablePartialIndex(pSrc->iCursor, pWC, pProbe->pPartIdxWhere) ){
+      testcase( pNew->iTab!=pSrc->iCursor );  /* See ticket [98d973b8f5] */
       continue;  /* Partial index inappropriate for this query */
     }
     rSize = pProbe->aiRowLogEst[0];
     pNew->u.btree.nEq = 0;
     pNew->u.btree.nSkip = 0;

Index: test/index7.test
==================================================================
--- test/index7.test
+++ test/index7.test
@@ -245,7 +245,37 @@
                                /* ^^^^^-- ignored */
   ANALYZE;
   SELECT count(*) FROM t3 WHERE t3.b BETWEEN 5 AND 10;
   SELECT stat+0 FROM sqlite_stat1 WHERE idx='t3b';
 } {6 6}
+
+# Verify that the problem identified by ticket [] has been fixed.
+#
+do_execsql_test index7-6.1 {
+  CREATE TABLE t5(a, b);
+  CREATE TABLE t4(c, d);
+  INSERT INTO t5 VALUES(1, 'xyz');
+  INSERT INTO t4 VALUES('abc', 'not xyz');
+  SELECT * FROM (SELECT * FROM t5 WHERE a=1 AND b='xyz'), t4 WHERE c='abc';
+} {
+  1 xyz abc {not xyz}
+}
+do_execsql_test index7-6.2 {
+  CREATE INDEX i4 ON t4(c) WHERE d='xyz';
+  SELECT * FROM (SELECT * FROM t5 WHERE a=1 AND b='xyz'), t4 WHERE c='abc';
+} {
+  1 xyz abc {not xyz}
+}
+do_execsql_test index7-6.3 {
+  CREATE VIEW v4 AS SELECT * FROM t4;
+  INSERT INTO t4 VALUES('def', 'xyz');
+  SELECT * FROM v4 WHERE d='xyz' AND c='def'
+} {
+  def xyz
+}
+do_eqp_test index7-6.4 {
+  SELECT * FROM v4 WHERE d='xyz' AND c='def'
+} {
+  0 0 0 {SEARCH TABLE t4 USING INDEX i4 (c=?)}
+}
 
 finish_test