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
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 } {/*SCAN cat USING COVERING INDEX catx*SEARCH ev USING COVERING INDEX evy (y=?)*/}
66 # The same plan is chosen regardless of the order of the tables in the
69 do_eqp_test analyze6-1.2 {
70 SELECT count(*) FROM cat, ev WHERE x=y
73 |--SCAN cat USING COVERING INDEX catx
74 `--SEARCH ev USING COVERING INDEX evy (y=?)
78 # Ticket [83ea97620bd3101645138b7b0e71c12c5498fe3d] 2011-03-30
79 # If ANALYZE is run on an empty table, make sure indices are used
82 do_test analyze6-2.1 {
84 CREATE TABLE t201(x INTEGER PRIMARY KEY, y UNIQUE, z);
85 CREATE INDEX t201z ON t201(z);
88 eqp {SELECT * FROM t201 WHERE z=5}
89 } {/*SEARCH t201 USING INDEX t201z (z=?)*/}
90 do_test analyze6-2.2 {
91 eqp {SELECT * FROM t201 WHERE y=5}
92 } {/*SEARCH t201 USING INDEX sqlite_autoindex_t201_1 (y=?)*/}
93 do_test analyze6-2.3 {
94 eqp {SELECT * FROM t201 WHERE x=5}
95 } {/*SEARCH t201 USING INTEGER PRIMARY KEY (rowid=?)*/}
96 do_test analyze6-2.4 {
98 INSERT INTO t201 VALUES(1,2,3),(2,3,4),(3,4,5);
101 eqp {SELECT * FROM t201 WHERE z=5}
102 } {/*SEARCH t201 USING INDEX t201z (z=?)*/}
103 do_test analyze6-2.5 {
104 eqp {SELECT * FROM t201 WHERE y=5}
105 } {/*SEARCH t201 USING INDEX sqlite_autoindex_t201_1 (y=?)*/}
106 do_test analyze6-2.6 {
107 eqp {SELECT * FROM t201 WHERE x=5}
108 } {/*SEARCH t201 USING INTEGER PRIMARY KEY (rowid=?)*/}
109 do_test analyze6-2.7 {
111 INSERT INTO t201 VALUES(4,5,7);
112 INSERT INTO t201 SELECT x+100, y+100, z+100 FROM t201;
113 INSERT INTO t201 SELECT x+200, y+200, z+200 FROM t201;
114 INSERT INTO t201 SELECT x+400, y+400, z+400 FROM t201;
117 eqp {SELECT * FROM t201 WHERE z=5}
118 } {/*SEARCH t201 USING INDEX t201z (z=?)*/}
119 do_test analyze6-2.8 {
120 eqp {SELECT * FROM t201 WHERE y=5}
121 } {/*SEARCH t201 USING INDEX sqlite_autoindex_t201_1 (y=?)*/}
122 do_test analyze6-2.9 {
123 eqp {SELECT * FROM t201 WHERE x=5}
124 } {/*SEARCH t201 USING INTEGER PRIMARY KEY (rowid=?)*/}