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      1 # 2008 April 1
      2 #
      3 # The author disclaims copyright to this source code.  In place of
      4 # a legal notice, here is a blessing:
      5 #
      6 #    May you do good and not evil.
      7 #    May you find forgiveness for yourself and forgive others.
      8 #    May you share freely, never taking more than you give.
      9 #
     10 #***********************************************************************
     11 #
     12 # Test cases designed to exercise and verify the logic for
     13 # factoring constant expressions out of loops and for
     14 # common subexpression eliminations.
     15 #
     16 # $Id: cse.test,v 1.6 2008/08/04 03:51:24 danielk1977 Exp $
     17 #
     18 
     19 set testdir [file dirname $argv0]
     20 source $testdir/tester.tcl
     21 
     22 do_test cse-1.1 {
     23   execsql {
     24     CREATE TABLE t1(a INTEGER PRIMARY KEY, b, c, d, e, f);
     25     INSERT INTO t1 VALUES(1,11,12,13,14,15);
     26     INSERT INTO t1 VALUES(2,21,22,23,24,25);
     27   }
     28   execsql {
     29     SELECT b, -b, ~b, NOT b, NOT NOT b, b-b, b+b, b*b, b/b, b FROM t1
     30   }
     31 } {11 -11 -12 0 1 0 22 121 1 11 21 -21 -22 0 1 0 42 441 1 21}
     32 do_test cse-1.2 {
     33   execsql {
     34     SELECT b, b%b, b==b, b!=b, b<b, b<=b, b IS NULL, b NOT NULL, b FROM t1
     35   }
     36 } {11 0 1 0 0 1 0 1 11 21 0 1 0 0 1 0 1 21}
     37 do_test cse-1.3 {
     38   execsql {
     39     SELECT b, abs(b), coalesce(b,-b,NOT b,c,NOT c), c, -c FROM t1;
     40   }
     41 } {11 11 11 12 -12 21 21 21 22 -22}
     42 do_test cse-1.4 {
     43   execsql {
     44     SELECT CASE WHEN a==1 THEN b ELSE c END, b, c FROM t1
     45   }
     46 } {11 11 12 22 21 22}
     47 do_test cse-1.5 {
     48   execsql {
     49     SELECT CASE a WHEN 1 THEN b WHEN 2 THEN c ELSE d END, b, c, d FROM t1
     50   }
     51 } {11 11 12 13 22 21 22 23}
     52 do_test cse-1.6.1 {
     53   execsql {
     54     SELECT CASE b WHEN 11 THEN -b WHEN 21 THEN -c ELSE -d END, b, c, d FROM t1
     55   }
     56 } {-11 11 12 13 -22 21 22 23}
     57 do_test cse-1.6.2 {
     58   execsql {
     59     SELECT CASE b+1 WHEN c THEN d WHEN e THEN f ELSE 999 END, b, c, d FROM t1
     60   }
     61 } {13 11 12 13 23 21 22 23}
     62 do_test cse-1.6.3 {
     63   execsql {
     64     SELECT CASE WHEN b THEN d WHEN e THEN f ELSE 999 END, b, c, d FROM t1
     65   }
     66 } {13 11 12 13 23 21 22 23}
     67 do_test cse-1.6.4 {
     68   execsql {
     69     SELECT b, c, d, CASE WHEN b THEN d WHEN e THEN f ELSE 999 END FROM t1
     70   }
     71 } {11 12 13 13 21 22 23 23}
     72 do_test cse-1.6.5 {
     73   execsql {
     74     SELECT b, c, d, CASE WHEN 0 THEN d WHEN e THEN f ELSE 999 END FROM t1
     75   }
     76 } {11 12 13 15 21 22 23 25}
     77 do_test cse-1.7 {
     78   execsql {
     79     SELECT a, -a, ~a, NOT a, NOT NOT a, a-a, a+a, a*a, a/a, a FROM t1
     80   }
     81 } {1 -1 -2 0 1 0 2 1 1 1 2 -2 -3 0 1 0 4 4 1 2}
     82 do_test cse-1.8 {
     83   execsql {
     84     SELECT a, a%a, a==a, a!=a, a<a, a<=a, a IS NULL, a NOT NULL, a FROM t1
     85   }
     86 } {1 0 1 0 0 1 0 1 1 2 0 1 0 0 1 0 1 2}
     87 do_test cse-1.9 {
     88   execsql {
     89     SELECT NOT b, ~b, NOT NOT b, b FROM t1
     90   }
     91 } {0 -12 1 11 0 -22 1 21}
     92 do_test cse-1.10 {
     93   execsql {
     94     SELECT CAST(b AS integer), typeof(b), CAST(b AS text), typeof(b) FROM t1
     95   }
     96 } {11 integer 11 integer 21 integer 21 integer}
     97 ifcapable compound {
     98   do_test cse-1.11 { 
     99     execsql {
    100       SELECT *,* FROM t1 WHERE a=2
    101       UNION ALL
    102       SELECT *,* FROM t1 WHERE a=1
    103     }
    104   } {2 21 22 23 24 25 2 21 22 23 24 25 1 11 12 13 14 15 1 11 12 13 14 15}
    105   do_test cse-1.12 { 
    106     execsql {
    107       SELECT coalesce(b,c,d,e), a, b, c, d, e FROM t1 WHERE a=2
    108       UNION ALL
    109       SELECT coalesce(e,d,c,b), e, d, c, b, a FROM t1 WHERE a=1
    110     }
    111   } {21 2 21 22 23 24 14 14 13 12 11 1}
    112 }
    113 do_test cse-1.13 {
    114   execsql {
    115      SELECT upper(b), typeof(b), b FROM t1
    116   }
    117 } {11 integer 11 21 integer 21}
    118 do_test cse-1.14 {
    119   execsql {
    120      SELECT b, typeof(b), upper(b), typeof(b), b FROM t1
    121   }
    122 } {11 integer 11 integer 11 21 integer 21 integer 21}
    123 
    124 # Overflow the column cache.  Create queries involving more and more
    125 # columns until the cache overflows.  Verify correct operation throughout.
    126 #
    127 do_test cse-2.1 {
    128   execsql {
    129     CREATE TABLE t2(a0,a1,a2,a3,a4,a5,a6,a7,a8,a9,
    130                     a10,a11,a12,a13,a14,a15,a16,a17,a18,a19,
    131                     a20,a21,a22,a23,a24,a25,a26,a27,a28,a29,
    132                     a30,a31,a32,a33,a34,a35,a36,a37,a38,a39,
    133                     a40,a41,a42,a43,a44,a45,a46,a47,a48,a49);
    134     INSERT INTO t2 VALUES(0,1,2,3,4,5,6,7,8,9,
    135                     10,11,12,13,14,15,16,17,18,19,
    136                     20,21,22,23,24,25,26,27,28,29,
    137                     30,31,32,33,34,35,36,37,38,39,
    138                     40,41,42,43,44,45,46,47,48,49);
    139     SELECT * FROM t2;
    140   }
    141 } {0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33 34 35 36 37 38 39 40 41 42 43 44 45 46 47 48 49}
    142 
    143 for {set i 1} {$i<100} {incr i} {
    144   set n [expr {int(rand()*44)+5}]
    145   set colset {}
    146   set answer {}
    147   for {set j 0} {$j<$n} {incr j} {
    148     set r [expr {$j+int(rand()*5)}]
    149     if {$r>49} {set r [expr {99-$r}]}
    150     lappend colset a$j a$r 
    151     lappend answer $j $r
    152   }
    153   set sql "SELECT [join $colset ,] FROM t2"
    154   do_test cse-2.2.$i {
    155     # explain $::sql
    156     execsql $::sql
    157   } $answer
    158 }
    159 
    160 finish_test
    161