Test that the default values used when sqlite_stat1 data is not available are calculated correctly. Fixes for the same.

FossilOrigin-Name: e2d42f909de85a0586389f2dc0e654f7af2e351a

manifest

@@ -1,5 +1,5 @@
-C Merge\strunk\schanges\sinto\sthis\sbranch.
-D 2014-04-29T16:46:24.176
+C Test\sthat\sthe\sdefault\svalues\sused\swhen\ssqlite_stat1\sdata\sis\snot\savailable\sare\scalculated\scorrectly.\sFixes\sfor\sthe\ssame.
+D 2014-04-29T19:01:57.481
 F Makefile.arm-wince-mingw32ce-gcc d6df77f1f48d690bd73162294bbba7f59507c72f
 F Makefile.in 2ef13430cd359f7b361bb863504e227b25cc7f81
 F Makefile.linux-gcc 91d710bdc4998cb015f39edf3cb314ec4f4d7e23
@@ -168,7 +168,7 @@ F src/btmutex.c 976f45a12e37293e32cae0281b15a21d48a8aaa7
 F src/btree.c 6c9b51abd404ce5b78b173b6f2248e8cb824758c
 F src/btree.h d79306df4ed9181b48916737fe8871a4392c4594
 F src/btreeInt.h cf180d86b2e9e418f638d65baa425c4c69c0e0e3
-F src/build.c 9f7b2ed2af66dd2d186c0835d1c2a672d1f768e0
+F src/build.c 02665ca158431a0926b10cbd7d8178a4c9fc4a22
 F src/callback.c 174e3c8656bc29f91d710ab61550d16eea34be98
 F src/complete.c dc1d136c0feee03c2f7550bafc0d29075e36deac
 F src/ctime.c 0231df905e2c4abba4483ee18ffc05adc321df2a
@@ -407,7 +407,7 @@ F test/corruptF.test be9fde98e4c93648f1ba52b74e5318edc8f59fe4
 F test/corruptG.test 1ab3bf97ee7bdba70e0ff3ba2320657df55d1804
 F test/corruptH.test 88ed71a086e13591c917aac6de32750e7c7281cb
 F test/corruptI.test b3e4203d420490fc3d3062711597bc1dea06a789
-F test/cost.test 62386ccac862ea9a808a0954037f430690974b0f
+F test/cost.test 41b350fcc811a4fcccffbab06a3a79f33b8ea0de
 F test/count.test 42a251178e32f617eda33f76236a7f79825a50b5
 F test/coveridxscan.test cdb47d01acc4a634a34fd25abe85189e0d0f1e62
 F test/crash.test fb9dc4a02dcba30d4aa5c2c226f98b220b2b959f
@@ -1166,7 +1166,7 @@ F tool/vdbe_profile.tcl 67746953071a9f8f2f668b73fe899074e2c6d8c1
 F tool/warnings-clang.sh f6aa929dc20ef1f856af04a730772f59283631d4
 F tool/warnings.sh d1a6de74685f360ab718efda6265994b99bbea01
 F tool/win/sqlite.vsix 030f3eeaf2cb811a3692ab9c14d021a75ce41fff
-P 5bb7757a7b32a74482d3e93e9c9eea02273fe981 af2cbe64adab5f9e3b0f3da00d06428088589d7f
-R 9c74729ef8e10b97c890b0be6d308bd3
+P d74299f037f3a6a4b3bce8b4d1c76c407c1f3b3e
+R e73cccb2b7e246d7f5476a97d396afde
 U dan
-Z e5760c6e9001de9044df542c0c7c165c
+Z 19f8efc43d85a395f7ff59d4035b6f55

manifest.uuid

@@ -1 +1 @@
-d74299f037f3a6a4b3bce8b4d1c76c407c1f3b3e
+e2d42f909de85a0586389f2dc0e654f7af2e351a

src/build.c

@@ -3260,32 +3260,27 @@ exit_create_index:
 ** are based on typical values found in actual indices.
 */
 void sqlite3DefaultRowEst(Index *pIdx){
-#if 0
-  tRowcnt *a = pIdx->aiRowEst;
-  int i;
-  tRowcnt n;
-  assert( a!=0 );
-  a[0] = pIdx->pTable->nRowEst;
-  if( a[0]<10 ) a[0] = 10;
-  n = 10;
-  for(i=1; i<=pIdx->nKeyCol; i++){
-    a[i] = n;
-    if( n>5 ) n--;
-  }
-  if( pIdx->onError!=OE_None ){
-    a[pIdx->nKeyCol] = 1;
-  }
-#endif
-  /*            1000000, 10,  9,  8,  7,  6,  5,  4,  3,  2 */
-  LogEst aVal[] = { 33, 32, 30, 28, 26, 23, 20, 16, 10 };
+  /*                10,  9,  8,  7,  6 */
+  LogEst aVal[] = { 33, 32, 30, 28, 26 };
   LogEst *a = pIdx->aiRowLogEst;
   int nCopy = MIN(ArraySize(aVal), pIdx->nKeyCol);
+  int i;
 
+  /* Set the first entry (number of rows in the index) to the estimated 
+  ** number of rows in the table. Or 10, if the estimated number of rows 
+  ** in the table is less than that.  */
   a[0] = pIdx->pTable->nRowLogEst;
+  if( a[0]<33 ) a[0] = 33;        assert( 33==sqlite3LogEst(10) );
+
+  /* Estimate that a[1] is 10, a[2] is 9, a[3] is 8, a[4] is 7, a[5] is
+  ** 6 and each subsequent value (if any) is 5.  */
   memcpy(&a[1], aVal, nCopy*sizeof(LogEst));
-  if( pIdx->onError!=OE_None ){
-    a[pIdx->nKeyCol] = 0;
+  for(i=nCopy+1; i<=pIdx->nKeyCol; i++){
+    a[i] = 23;                    assert( 23==sqlite3LogEst(5) );
   }
+
+  assert( 0==sqlite3LogEst(1) );
+  if( pIdx->onError!=OE_None ) a[pIdx->nKeyCol] = 0;
 }
 
 /*

test/cost.test

@@ -192,6 +192,51 @@ do_eqp_test 8.2 {
   0 0 0 {USE TEMP B-TREE FOR DISTINCT}
 }
 
+#-------------------------------------------------------------------------
+#
+do_execsql_test 9.1 {
+  CREATE TABLE t1(
+    a,b,c,d,e, f,g,h,i,j,
+    k,l,m,n,o, p,q,r,s,t
+  );
+  CREATE INDEX i1 ON t1(k,l,m,n,o,p,q,r,s,t);
+}
+do_test 9.2 {
+  for {set i 0} {$i < 100} {incr i} {
+    execsql { INSERT INTO t1 DEFAULT VALUES }
+  }
+  execsql {
+    ANALYZE;
+    CREATE INDEX i2 ON t1(a,b,c,d,e,f,g,h,i,j);
+  }
+} {}
+
+set L [list a=? b=? c=? d=? e=? f=? g=? h=? i=? j=?]
+foreach {tn nTerm nRow} {
+  1   1 10
+  2   2  9
+  3   3  8
+  4   4  7
+  5   5  6
+  6   6  5
+  7   7  5
+  8   8  5
+  9   9  5
+  10 10  5
+} {
+  set w [join [lrange $L 0 [expr $nTerm-1]] " AND "]
+  set p1 [expr ($nRow-1) / 100.0]
+  set p2 [expr ($nRow+1) / 100.0]
+
+  set sql1 "SELECT * FROM t1 WHERE likelihood(k=?, $p1) AND $w"
+  set sql2 "SELECT * FROM t1 WHERE likelihood(k=?, $p2) AND $w"
+
+  do_eqp_test 9.3.$tn.1 $sql1 {/INDEX i1/}
+  do_eqp_test 9.3.$tn.2 $sql2 {/INDEX i2/}
+}
+
+
+
 finish_test