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    1: # 2011 August 13
    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: # This file implements tests for SQLite library.  The focus of the tests
   13: # in this file is testing the capabilities of sqlite_stat3.
   14: #
   15: 
   16: set testdir [file dirname $argv0]
   17: source $testdir/tester.tcl
   18: 
   19: ifcapable !stat3 {
   20:   finish_test
   21:   return
   22: }
   23: 
   24: set testprefix analyze8
   25: 
   26: proc eqp {sql {db db}} {
   27:   uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db
   28: }
   29: 
   30: # Scenario:
   31: #
   32: #    Two indices.  One has mostly singleton entries, but for a few
   33: #    values there are hundreds of entries.  The other has 10-20
   34: #    entries per value.
   35: #
   36: # Verify that the query planner chooses the first index for the singleton
   37: # entries and the second index for the others.
   38: #
   39: do_test 1.0 {
   40:   db eval {
   41:     CREATE TABLE t1(a,b,c,d);
   42:     CREATE INDEX t1a ON t1(a);
   43:     CREATE INDEX t1b ON t1(b);
   44:     CREATE INDEX t1c ON t1(c);
   45:   }
   46:   for {set i 0} {$i<1000} {incr i} {
   47:     if {$i%2==0} {set a $i} {set a [expr {($i%8)*100}]}
   48:     set b [expr {$i/10}]
   49:     set c [expr {$i/8}]
   50:     set c [expr {$c*$c*$c}]
   51:     db eval {INSERT INTO t1 VALUES($a,$b,$c,$i)}
   52:   }
   53:   db eval {ANALYZE}
   54: } {}
   55: 
   56: # The a==100 comparison is expensive because there are many rows
   57: # with a==100.  And so for those cases, choose the t1b index.
   58: #
   59: # Buf ro a==99 and a==101, there are far fewer rows so choose
   60: # the t1a index.
   61: #
   62: do_test 1.1 {
   63:   eqp {SELECT * FROM t1 WHERE a=100 AND b=55}
   64: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~2 rows)}}
   65: do_test 1.2 {
   66:   eqp {SELECT * FROM t1 WHERE a=99 AND b=55}
   67: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
   68: do_test 1.3 {
   69:   eqp {SELECT * FROM t1 WHERE a=101 AND b=55}
   70: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
   71: do_test 1.4 {
   72:   eqp {SELECT * FROM t1 WHERE a=100 AND b=56}
   73: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b=?) (~2 rows)}}
   74: do_test 1.5 {
   75:   eqp {SELECT * FROM t1 WHERE a=99 AND b=56}
   76: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
   77: do_test 1.6 {
   78:   eqp {SELECT * FROM t1 WHERE a=101 AND b=56}
   79: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~1 rows)}}
   80: do_test 2.1 {
   81:   eqp {SELECT * FROM t1 WHERE a=100 AND b BETWEEN 50 AND 54}
   82: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b>? AND b<?) (~2 rows)}}
   83: 
   84: # There are many more values of c between 0 and 100000 than there are
   85: # between 800000 and 900000.  So t1c is more selective for the latter
   86: # range.
   87: #
   88: do_test 3.1 {
   89:   eqp {SELECT * FROM t1 WHERE b BETWEEN 50 AND 54 AND c BETWEEN 0 AND 100000}
   90: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1b (b>? AND b<?) (~6 rows)}}
   91: do_test 3.2 {
   92:   eqp {SELECT * FROM t1
   93:        WHERE b BETWEEN 50 AND 54 AND c BETWEEN 800000 AND 900000}
   94: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1c (c>? AND c<?) (~4 rows)}}
   95: do_test 3.3 {
   96:   eqp {SELECT * FROM t1 WHERE a=100 AND c BETWEEN 0 AND 100000}
   97: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1a (a=?) (~63 rows)}}
   98: do_test 3.4 {
   99:   eqp {SELECT * FROM t1
  100:        WHERE a=100 AND c BETWEEN 800000 AND 900000}
  101: } {0 0 0 {SEARCH TABLE t1 USING INDEX t1c (c>? AND c<?) (~2 rows)}}
  102: 
  103: finish_test