3772206769
reduce likelihood of selection) to full table scans. FossilOrigin-Name: 878da276ebf643b716ddd650d4d0ca3595fe5bf2
195 lines
6.4 KiB
Plaintext
195 lines
6.4 KiB
Plaintext
# 2011 January 19
|
|
#
|
|
# The author disclaims copyright to this source code. In place of
|
|
# a legal notice, here is a blessing:
|
|
#
|
|
# May you do good and not evil.
|
|
# May you find forgiveness for yourself and forgive others.
|
|
# May you share freely, never taking more than you give.
|
|
#
|
|
#***********************************************************************
|
|
#
|
|
# This file implements tests for SQLite library. The focus of the tests
|
|
# in this file is the use of the sqlite_stat2 histogram data on tables
|
|
# with many repeated values and only a few distinct values.
|
|
#
|
|
|
|
set testdir [file dirname $argv0]
|
|
source $testdir/tester.tcl
|
|
|
|
ifcapable !stat2 {
|
|
finish_test
|
|
return
|
|
}
|
|
|
|
set testprefix analyze5
|
|
|
|
proc eqp {sql {db db}} {
|
|
uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db
|
|
}
|
|
|
|
unset -nocomplain i t u v w x y z
|
|
do_test analyze5-1.0 {
|
|
db eval {CREATE TABLE t1(t,u,v TEXT COLLATE nocase,w,x,y,z)}
|
|
for {set i 0} {$i < 1000} {incr i} {
|
|
set y [expr {$i>=25 && $i<=50}]
|
|
set z [expr {($i>=400) + ($i>=700) + ($i>=875)}]
|
|
set x $z
|
|
set w $z
|
|
set t [expr {$z+0.5}]
|
|
switch $z {
|
|
0 {set u "alpha"; unset x}
|
|
1 {set u "bravo"}
|
|
2 {set u "charlie"}
|
|
3 {set u "delta"; unset w}
|
|
}
|
|
if {$i%2} {set v $u} {set v [string toupper $u]}
|
|
db eval {INSERT INTO t1 VALUES($t,$u,$v,$w,$x,$y,$z)}
|
|
}
|
|
db eval {
|
|
CREATE INDEX t1t ON t1(t); -- 0.5, 1.5, 2.5, and 3.5
|
|
CREATE INDEX t1u ON t1(u); -- text
|
|
CREATE INDEX t1v ON t1(v); -- mixed case text
|
|
CREATE INDEX t1w ON t1(w); -- integers 0, 1, 2 and a few NULLs
|
|
CREATE INDEX t1x ON t1(x); -- integers 1, 2, 3 and many NULLs
|
|
CREATE INDEX t1y ON t1(y); -- integers 0 and very few 1s
|
|
CREATE INDEX t1z ON t1(z); -- integers 0, 1, 2, and 3
|
|
ANALYZE;
|
|
SELECT sample FROM sqlite_stat2 WHERE idx='t1u' ORDER BY sampleno;
|
|
}
|
|
} {alpha alpha alpha alpha bravo bravo bravo charlie charlie delta}
|
|
do_test analyze5-1.1 {
|
|
string tolower \
|
|
[db eval {SELECT sample from sqlite_stat2 WHERE idx='t1v' ORDER BY sampleno}]
|
|
} {alpha alpha alpha alpha bravo bravo bravo charlie charlie delta}
|
|
do_test analyze5-1.2 {
|
|
db eval {SELECT sample from sqlite_stat2 WHERE idx='t1w' ORDER BY sampleno}
|
|
} {{} 0 0 0 0 1 1 1 2 2}
|
|
do_test analyze5-1.3 {
|
|
db eval {SELECT sample from sqlite_stat2 WHERE idx='t1x' ORDER BY sampleno}
|
|
} {{} {} {} {} 1 1 1 2 2 3}
|
|
do_test analyze5-1.4 {
|
|
db eval {SELECT sample from sqlite_stat2 WHERE idx='t1y' ORDER BY sampleno}
|
|
} {0 0 0 0 0 0 0 0 0 0}
|
|
do_test analyze5-1.5 {
|
|
db eval {SELECT sample from sqlite_stat2 WHERE idx='t1z' ORDER BY sampleno}
|
|
} {0 0 0 0 1 1 1 2 2 3}
|
|
do_test analyze5-1.6 {
|
|
db eval {SELECT sample from sqlite_stat2 WHERE idx='t1t' ORDER BY sampleno}
|
|
} {0.5 0.5 0.5 0.5 1.5 1.5 1.5 2.5 2.5 3.5}
|
|
|
|
|
|
# Verify that range queries generate the correct row count estimates
|
|
#
|
|
foreach {testid where index rows} {
|
|
1 {z>=0 AND z<=0} t1z 400
|
|
2 {z>=1 AND z<=1} t1z 300
|
|
3 {z>=2 AND z<=2} t1z 200
|
|
4 {z>=3 AND z<=3} t1z 100
|
|
5 {z>=4 AND z<=4} t1z 50
|
|
6 {z>=-1 AND z<=-1} t1z 50
|
|
7 {z>1 AND z<3} t1z 200
|
|
8 {z>0 AND z<100} t1z 600
|
|
9 {z>=1 AND z<100} t1z 600
|
|
10 {z>1 AND z<100} t1z 300
|
|
11 {z>=2 AND z<100} t1z 300
|
|
12 {z>2 AND z<100} t1z 100
|
|
13 {z>=3 AND z<100} t1z 100
|
|
14 {z>3 AND z<100} t1z 50
|
|
15 {z>=4 AND z<100} t1z 50
|
|
16 {z>=-100 AND z<=-1} t1z 50
|
|
17 {z>=-100 AND z<=0} t1z 400
|
|
18 {z>=-100 AND z<0} t1z 50
|
|
19 {z>=-100 AND z<=1} t1z 700
|
|
20 {z>=-100 AND z<2} t1z 700
|
|
21 {z>=-100 AND z<=2} t1z 900
|
|
22 {z>=-100 AND z<3} t1z 900
|
|
|
|
31 {z>=0.0 AND z<=0.0} t1z 400
|
|
32 {z>=1.0 AND z<=1.0} t1z 300
|
|
33 {z>=2.0 AND z<=2.0} t1z 200
|
|
34 {z>=3.0 AND z<=3.0} t1z 100
|
|
35 {z>=4.0 AND z<=4.0} t1z 50
|
|
36 {z>=-1.0 AND z<=-1.0} t1z 50
|
|
37 {z>1.5 AND z<3.0} t1z 200
|
|
38 {z>0.5 AND z<100} t1z 600
|
|
39 {z>=1.0 AND z<100} t1z 600
|
|
40 {z>1.5 AND z<100} t1z 300
|
|
41 {z>=2.0 AND z<100} t1z 300
|
|
42 {z>2.1 AND z<100} t1z 100
|
|
43 {z>=3.0 AND z<100} t1z 100
|
|
44 {z>3.2 AND z<100} t1z 50
|
|
45 {z>=4.0 AND z<100} t1z 50
|
|
46 {z>=-100 AND z<=-1.0} t1z 50
|
|
47 {z>=-100 AND z<=0.0} t1z 400
|
|
48 {z>=-100 AND z<0.0} t1z 50
|
|
49 {z>=-100 AND z<=1.0} t1z 700
|
|
50 {z>=-100 AND z<2.0} t1z 700
|
|
51 {z>=-100 AND z<=2.0} t1z 900
|
|
52 {z>=-100 AND z<3.0} t1z 900
|
|
|
|
101 {z=-1} t1z 50
|
|
102 {z=0} t1z 400
|
|
103 {z=1} t1z 300
|
|
104 {z=2} t1z 200
|
|
105 {z=3} t1z 100
|
|
106 {z=4} t1z 50
|
|
107 {z=-10.0} t1z 50
|
|
108 {z=0.0} t1z 400
|
|
109 {z=1.0} t1z 300
|
|
110 {z=2.0} t1z 200
|
|
111 {z=3.0} t1z 100
|
|
112 {z=4.0} t1z 50
|
|
113 {z=1.5} t1z 50
|
|
114 {z=2.5} t1z 50
|
|
|
|
201 {z IN (-1)} t1z 50
|
|
202 {z IN (0)} t1z 400
|
|
203 {z IN (1)} t1z 300
|
|
204 {z IN (2)} t1z 200
|
|
205 {z IN (3)} t1z 100
|
|
206 {z IN (4)} t1z 50
|
|
207 {z IN (0.5)} t1z 50
|
|
208 {z IN (0,1)} t1z 700
|
|
209 {z IN (0,1,2)} t1z 900
|
|
210 {z IN (0,1,2,3)} {} 100
|
|
211 {z IN (0,1,2,3,4,5)} {} 100
|
|
212 {z IN (1,2)} t1z 500
|
|
213 {z IN (2,3)} t1z 300
|
|
214 {z=3 OR z=2} t1z 300
|
|
215 {z IN (-1,3)} t1z 150
|
|
216 {z=-1 OR z=3} t1z 150
|
|
|
|
300 {y=0} {} 100
|
|
301 {y=1} t1y 50
|
|
302 {y=0.1} t1y 50
|
|
|
|
} {
|
|
# Verify that the expected index is used with the expected row count
|
|
do_test analyze5-1.${testid}a {
|
|
set x [lindex [eqp "SELECT * FROM t1 WHERE $where"] 3]
|
|
set idx {}
|
|
regexp {INDEX (t1.) } $x all idx
|
|
regexp {~([0-9]+) rows} $x all nrow
|
|
list $idx $nrow
|
|
} [list $index $rows]
|
|
|
|
# Verify that the same result is achieved regardless of whether or not
|
|
# the index is used
|
|
do_test analyze5-1.${testid}b {
|
|
set w2 [string map {y +y z +z} $where]
|
|
set a1 [db eval "SELECT rowid FROM t1 NOT INDEXED WHERE $w2\
|
|
ORDER BY +rowid"]
|
|
set a2 [db eval "SELECT rowid FROM t1 WHERE $where ORDER BY +rowid"]
|
|
if {$a1==$a2} {
|
|
set res ok
|
|
} else {
|
|
set res "a1=\[$a1\] a2=\[$a2\]"
|
|
}
|
|
set res
|
|
} {ok}
|
|
}
|
|
|
|
|
|
finish_test
|