The sqlite3ExprCodeGetColumn() is not guaranteed to put the result in the

register requested.   Fix the skip-scan code generator for WITHOUT ROWID
tables so that it always checks the register and copies the result if it
lands in the wrong register.  Fix for ticket [8fd39115d8f46ece70e7d4b3].

FossilOrigin-Name: 793e206f9032d9205bdb3f447b136bed9a25fa22

manifest

@@ -1,5 +1,5 @@
-C Fix\sharmless\scompiler\swarning\sin\sMSVC\s2015.
-D 2015-07-21T19:22:35.266
+C The\ssqlite3ExprCodeGetColumn()\sis\snot\sguaranteed\sto\sput\sthe\sresult\sin\sthe\nregister\srequested.\s\s\sFix\sthe\sskip-scan\scode\sgenerator\sfor\sWITHOUT\sROWID\ntables\sso\sthat\sit\salways\schecks\sthe\sregister\sand\scopies\sthe\sresult\sif\sit\nlands\sin\sthe\swrong\sregister.\s\sFix\sfor\sticket\s[8fd39115d8f46ece70e7d4b3].
+D 2015-07-23T16:39:33.653
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 6b439e21d6dabede337772b85959340d37bb17bb
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -406,7 +406,7 @@ F src/wal.h df01efe09c5cb8c8e391ff1715cca294f89668a4
 F src/walker.c c253b95b4ee44b21c406e2a1052636c31ea27804
 F src/where.c 909eba3b6db984eb2adfbca9de2c237ee7056adb
 F src/whereInt.h 5f87e3c4b0551747d119730dfebddd3c54f04047
-F src/wherecode.c 0669481cabaf5caf934b6bb825df15bc57f60d40
+F src/wherecode.c 5da5049224f12db314931ae7e0919b4914a2a0b1
 F src/whereexpr.c 9ce1c9cfedbf80c93c7d899497025ec8256ce652
 F test/8_3_names.test ebbb5cd36741350040fd28b432ceadf495be25b2
 F test/affinity2.test a6d901b436328bd67a79b41bb0ac2663918fe3bd
@@ -985,7 +985,7 @@ F test/shortread1.test bb591ef20f0fd9ed26d0d12e80eee6d7ac8897a3
 F test/show_speedtest1_rtree.tcl 32e6c5f073d7426148a6936a0408f4b5b169aba5
 F test/shrink.test 06deac10d591186017466ce67d10645150bfdeec
 F test/sidedelete.test f0ad71abe6233e3b153100f3b8d679b19a488329
-F test/skipscan1.test 2ddfe5d168462170c4487f534e2a99fb006b2076
+F test/skipscan1.test d37a75b4be4eb9dedeb69b4f38b1d0a74b5021d7
 F test/skipscan2.test d1d1450952b7275f0b0a3a981f0230532743951a
 F test/skipscan3.test ec5bab3f81c7038b43450e7b3062e04a198bdbb5
 F test/skipscan5.test 67817a4b6857c47e0e33ba3e506da6f23ef68de2
@@ -1365,7 +1365,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh 48bd54594752d5be3337f12c72f28d2080cb630b
 F tool/win/sqlite.vsix deb315d026cc8400325c5863eef847784a219a2f
-P e0a9978077a1b4e5988681438e4efff93920e574
-R cbf3f19f824b2b3f6f21c8e30bb2d4e0
-U mistachkin
-Z 106701e31e609f92431b2c0ad60fc867
+P 01c8b9ccfa0f336dfead7c004de3de571753f707
+R 23f175ee7b2eb2636faea6e0fbfacef1
+U drh
+Z 1c321a77d86fb7457929725064e82b93

manifest.uuid

@@ -1 +1 @@
-01c8b9ccfa0f336dfead7c004de3de571753f707
+793e206f9032d9205bdb3f447b136bed9a25fa22

src/wherecode.c

@@ -1296,7 +1296,11 @@ Bitmask sqlite3WhereCodeOneLoopStart(
               r = sqlite3GetTempRange(pParse, nPk);
               for(iPk=0; iPk<nPk; iPk++){
                 int iCol = pPk->aiColumn[iPk];
-                sqlite3ExprCodeGetColumn(pParse, pTab, iCol, iCur, r+iPk, 0);
+                int rx;
+                rx = sqlite3ExprCodeGetColumn(pParse, pTab, iCol, iCur,r+iPk,0);
+                if( rx!=r+iPk ){
+                  sqlite3VdbeAddOp2(v, OP_SCopy, rx, r+iPk);
+                }
               }
 
               /* Check if the temp table already contains this key. If so,

test/skipscan1.test

@@ -292,4 +292,34 @@ do_execsql_test skipscan1-7.3 {
   EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
 } {~/ANY/}
 
+# Ticket 8fd39115d8f46ece70e7d4b3c481d1bd86194746  2015-07-23
+# Incorrect code generated for a skipscan within an OR optimization
+# on a WITHOUT ROWID table.
+#
+do_execsql_test skipscan1-8.1 {
+  DROP TABLE IF EXISTS t1;
+  CREATE TABLE t1(x, y, PRIMARY KEY(x,y)) WITHOUT ROWID;
+  INSERT INTO t1(x,y) VALUES(1,'AB');
+  INSERT INTO t1(x,y) VALUES(2,'CD');
+  ANALYZE;
+  DROP TABLE IF EXISTS sqlite_stat4;
+  DELETE FROM sqlite_stat1;
+  INSERT INTO sqlite_stat1(tbl,idx,stat) VALUES('t1','t1','1000000 100 1');
+  ANALYZE sqlite_master;
+  SELECT * FROM t1
+   WHERE (y = 'AB' AND x <= 4)
+      OR (y = 'EF' AND x = 5);
+} {1 AB}
+do_execsql_test skipscan1-8.1eqp {
+  EXPLAIN QUERY PLAN
+  SELECT * FROM t1
+   WHERE (y = 'AB' AND x <= 4)
+      OR (y = 'EF' AND x = 5);
+} {/ANY/}
+do_execsql_test skipscan1-8.2 {
+  SELECT * FROM t1
+   WHERE y = 'AB' OR (y = 'CD' AND x = 2)
+  ORDER BY +x;
+} {1 AB 2 CD}
+
 finish_test