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analyze5.test
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analyze5.test
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# 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_stat3 histogram data on tables
# with many repeated values and only a few distinct values.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
ifcapable !stat3 {
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_stat3 WHERE idx='t1u' ORDER BY nlt;
}
} {alpha bravo charlie delta}
do_test analyze5-1.1 {
db eval {SELECT DISTINCT lower(sample) FROM sqlite_stat3 WHERE idx='t1v'
ORDER BY 1}
} {alpha bravo charlie delta}
do_test analyze5-1.2 {
db eval {SELECT idx, count(*) FROM sqlite_stat3 GROUP BY 1 ORDER BY 1}
} {t1t 4 t1u 4 t1v 4 t1w 4 t1x 4 t1y 2 t1z 4}
# 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 175
4 {z>=3 AND z<=3} t1z 125
5 {z>=4 AND z<=4} t1z 1
6 {z>=-1 AND z<=-1} t1z 1
7 {z>1 AND z<3} t1z 175
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 125
13 {z>=3 AND z<100} t1z 125
14 {z>3 AND z<100} t1z 1
15 {z>=4 AND z<100} t1z 1
16 {z>=-100 AND z<=-1} t1z 1
17 {z>=-100 AND z<=0} t1z 400
18 {z>=-100 AND z<0} t1z 1
19 {z>=-100 AND z<=1} t1z 700
20 {z>=-100 AND z<2} t1z 700
21 {z>=-100 AND z<=2} t1z 875
22 {z>=-100 AND z<3} t1z 875
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 175
34 {z>=3.0 AND z<=3.0} t1z 125
35 {z>=4.0 AND z<=4.0} t1z 1
36 {z>=-1.0 AND z<=-1.0} t1z 1
37 {z>1.5 AND z<3.0} t1z 174
38 {z>0.5 AND z<100} t1z 599
39 {z>=1.0 AND z<100} t1z 600
40 {z>1.5 AND z<100} t1z 299
41 {z>=2.0 AND z<100} t1z 300
42 {z>2.1 AND z<100} t1z 124
43 {z>=3.0 AND z<100} t1z 125
44 {z>3.2 AND z<100} t1z 1
45 {z>=4.0 AND z<100} t1z 1
46 {z>=-100 AND z<=-1.0} t1z 1
47 {z>=-100 AND z<=0.0} t1z 400
48 {z>=-100 AND z<0.0} t1z 1
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 875
52 {z>=-100 AND z<3.0} t1z 875
101 {z=-1} t1z 1
102 {z=0} t1z 400
103 {z=1} t1z 300
104 {z=2} t1z 175
105 {z=3} t1z 125
106 {z=4} t1z 1
107 {z=-10.0} t1z 1
108 {z=0.0} t1z 400
109 {z=1.0} t1z 300
110 {z=2.0} t1z 175
111 {z=3.0} t1z 125
112 {z=4.0} t1z 1
113 {z=1.5} t1z 1
114 {z=2.5} t1z 1
201 {z IN (-1)} t1z 1
202 {z IN (0)} t1z 400
203 {z IN (1)} t1z 300
204 {z IN (2)} t1z 175
205 {z IN (3)} t1z 125
206 {z IN (4)} t1z 1
207 {z IN (0.5)} t1z 1
208 {z IN (0,1)} t1z 700
209 {z IN (0,1,2)} t1z 875
210 {z IN (0,1,2,3)} {} 100
211 {z IN (0,1,2,3,4,5)} {} 100
212 {z IN (1,2)} t1z 475
213 {z IN (2,3)} t1z 300
214 {z=3 OR z=2} t1z 300
215 {z IN (-1,3)} t1z 126
216 {z=-1 OR z=3} t1z 126
300 {y=0} t1y 974
301 {y=1} t1y 26
302 {y=0.1} t1y 1
400 {x IS NULL} t1x 400
} {
# 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}
}
# Increase the number of NULLs in column x
#
db eval {
UPDATE t1 SET x=NULL;
UPDATE t1 SET x=rowid
WHERE rowid IN (SELECT rowid FROM t1 ORDER BY random() LIMIT 5);
ANALYZE;
}
# Verify that range queries generate the correct row count estimates
#
foreach {testid where index rows} {
500 {x IS NULL AND u='charlie'} t1u 17
501 {x=1 AND u='charlie'} t1x 1
502 {x IS NULL} t1x 995
503 {x=1} t1x 1
504 {x IS NOT NULL} t1x 2
505 {+x IS NOT NULL} {} 500
506 {upper(x) IS NOT NULL} {} 500
} {
# Verify that the expected index is used with the expected row count
if {$testid==50299} {breakpoint; set sqlite_where_trace 1}
do_test analyze5-1.${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 $rows]
if {$testid==50299} exit
# 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