wasCSharpSQLite – Blame information for rev 4

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1 office 1 # 2009 March 28
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 # Ticket #3757: The cost functions on the query optimizer for the
13 # IN operator can be improved.
14 #
15 # $Id: tkt3757.test,v 1.1 2009/03/29 00:13:04 drh Exp $
16  
17 set testdir [file dirname $argv0]
18 source $testdir/tester.tcl
19  
20 # Evaluate SQL. Return the result set followed by the
21 # and the number of full-scan steps.
22 #
23 proc count_steps {sql} {
24 set r [db eval $sql]
25 lappend r scan [db status step] sort [db status sort]
26 }
27  
28 # Construct tables
29 #
30 do_test tkt3757-1.1 {
31 db eval {
32 CREATE TABLE t1(x INTEGER, y INTEGER, z TEXT);
33 CREATE INDEX t1i1 ON t1(y,z);
34 INSERT INTO t1 VALUES(1,2,'three');
35 CREATE TABLE t2(a INTEGER, b TEXT);
36 INSERT INTO t2 VALUES(2, 'two');
37 ANALYZE;
38 SELECT * FROM sqlite_stat1 ORDER BY 1, 2;
39 }
40 } {t1 t1i1 {1 1 1} t2 {} 1}
41  
42 # Modify statistics in order to make the optimizer then that:
43 #
44 # (1) Table T1 has about 250K entries
45 # (2) There are only about 5 distinct values of T1.
46 #
47 # Then run a query with "t1.y IN (SELECT ..)" in the WHERE clause.
48 # Make sure the index is used.
49 #
50 do_test tkt3757-1.2 {
51 db eval {
52 DELETE FROM sqlite_stat1;
53 INSERT INTO sqlite_stat1 VALUES('t1','t1i1','250000 50000 30');
54 }
55 count_steps {
56 SELECT * FROM t1 WHERE y IN (SELECT a FROM t2)
57 }
58 } {1 2 three scan 0 sort 0}
59  
60 finish_test