3 # The author disclaims copyright to this source code. In place of
4 # a legal notice, here is a blessing:
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.
10 #***********************************************************************
12 # This file implements tests for SQLite library. The focus of the tests
13 # in this file a corner-case query planner optimization involving the
14 # join order of two tables of different sizes.
17 set testdir [file dirname $argv0]
18 source $testdir/tester.tcl
20 ifcapable !stat4&&!stat3 {
25 set testprefix analyze6
27 proc eqp {sql {db db}} {
28 uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db
31 do_test analyze6-1.0 {
33 CREATE TABLE cat(x INT, yz TEXT);
34 CREATE UNIQUE INDEX catx ON cat(x);
35 /* Give cat 16 unique integers */
36 INSERT INTO cat(x) VALUES(1);
37 INSERT INTO cat(x) VALUES(2);
38 INSERT INTO cat(x) SELECT x+2 FROM cat;
39 INSERT INTO cat(x) SELECT x+4 FROM cat;
40 INSERT INTO cat(x) SELECT x+8 FROM cat;
42 CREATE TABLE ev(y INT);
43 CREATE INDEX evy ON ev(y);
44 /* ev will hold 32 copies of 16 integers found in cat */
45 INSERT INTO ev SELECT x FROM cat;
46 INSERT INTO ev SELECT x FROM cat;
47 INSERT INTO ev SELECT y FROM ev;
48 INSERT INTO ev SELECT y FROM ev;
49 INSERT INTO ev SELECT y FROM ev;
50 INSERT INTO ev SELECT y FROM ev;
52 SELECT count(*) FROM cat;
53 SELECT count(*) FROM ev;
57 # The lowest cost plan is to scan CAT and for each integer there, do a single
58 # lookup of the first corresponding entry in EV then read off the equal values
59 # in EV. (Prior to the 2011-03-04 enhancement to where.c, this query would
60 # have used EV for the outer loop instead of CAT - which was about 3x slower.)
62 do_test analyze6-1.1 {
63 eqp {SELECT count(*) FROM ev, cat WHERE x=y}
64 } {0 0 1 {SCAN TABLE cat USING COVERING INDEX catx} 0 1 0 {SEARCH TABLE ev USING COVERING INDEX evy (y=?)}}
66 # The same plan is chosen regardless of the order of the tables in the
69 do_test analyze6-1.2 {
70 eqp {SELECT count(*) FROM cat, ev WHERE x=y}
71 } {0 0 0 {SCAN TABLE cat USING COVERING INDEX catx} 0 1 1 {SEARCH TABLE ev USING COVERING INDEX evy (y=?)}}
74 # Ticket [83ea97620bd3101645138b7b0e71c12c5498fe3d] 2011-03-30
75 # If ANALYZE is run on an empty table, make sure indices are used
78 do_test analyze6-2.1 {
80 CREATE TABLE t201(x INTEGER PRIMARY KEY, y UNIQUE, z);
81 CREATE INDEX t201z ON t201(z);
84 eqp {SELECT * FROM t201 WHERE z=5}
85 } {0 0 0 {SEARCH TABLE t201 USING INDEX t201z (z=?)}}
86 do_test analyze6-2.2 {
87 eqp {SELECT * FROM t201 WHERE y=5}
88 } {0 0 0 {SEARCH TABLE t201 USING INDEX sqlite_autoindex_t201_1 (y=?)}}
89 do_test analyze6-2.3 {
90 eqp {SELECT * FROM t201 WHERE x=5}
91 } {0 0 0 {SEARCH TABLE t201 USING INTEGER PRIMARY KEY (rowid=?)}}
92 do_test analyze6-2.4 {
94 INSERT INTO t201 VALUES(1,2,3);
97 eqp {SELECT * FROM t201 WHERE z=5}
98 } {0 0 0 {SEARCH TABLE t201 USING INDEX t201z (z=?)}}
99 do_test analyze6-2.5 {
100 eqp {SELECT * FROM t201 WHERE y=5}
101 } {0 0 0 {SEARCH TABLE t201 USING INDEX sqlite_autoindex_t201_1 (y=?)}}
102 do_test analyze6-2.6 {
103 eqp {SELECT * FROM t201 WHERE x=5}
104 } {0 0 0 {SEARCH TABLE t201 USING INTEGER PRIMARY KEY (rowid=?)}}
105 do_test analyze6-2.7 {
107 INSERT INTO t201 VALUES(4,5,7);
108 INSERT INTO t201 SELECT x+100, y+100, z+100 FROM t201;
109 INSERT INTO t201 SELECT x+200, y+200, z+200 FROM t201;
110 INSERT INTO t201 SELECT x+400, y+400, z+400 FROM t201;
113 eqp {SELECT * FROM t201 WHERE z=5}
114 } {0 0 0 {SEARCH TABLE t201 USING INDEX t201z (z=?)}}
115 do_test analyze6-2.8 {
116 eqp {SELECT * FROM t201 WHERE y=5}
117 } {0 0 0 {SEARCH TABLE t201 USING INDEX sqlite_autoindex_t201_1 (y=?)}}
118 do_test analyze6-2.9 {
119 eqp {SELECT * FROM t201 WHERE x=5}
120 } {0 0 0 {SEARCH TABLE t201 USING INTEGER PRIMARY KEY (rowid=?)}}