github.com/jdgcs/sqlite3@v1.12.1-0.20210908114423-bc5f96e4dd51/testdata/tcl/analyze5.test (about) 1 # 2011 January 19 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 # This file implements tests for SQLite library. The focus of the tests 13 # in this file is the use of the sqlite_stat4 histogram data on tables 14 # with many repeated values and only a few distinct values. 15 # 16 17 set testdir [file dirname $argv0] 18 source $testdir/tester.tcl 19 20 ifcapable !stat4 { 21 finish_test 22 return 23 } 24 25 set testprefix analyze5 26 27 proc eqp {sql {db db}} { 28 uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db 29 } 30 31 proc alpha {blob} { 32 set ret "" 33 foreach c [split $blob {}] { 34 if {[string is alpha $c]} {append ret $c} 35 } 36 return $ret 37 } 38 db func alpha alpha 39 40 db func lindex lindex 41 42 unset -nocomplain i t u v w x y z 43 do_test analyze5-1.0 { 44 db eval {CREATE TABLE t1(t,u,v TEXT COLLATE nocase,w,x,y,z)} 45 for {set i 0} {$i < 1000} {incr i} { 46 set y [expr {$i>=25 && $i<=50}] 47 set z [expr {($i>=400) + ($i>=700) + ($i>=875)}] 48 set x $z 49 set w $z 50 set t [expr {$z+0.5}] 51 switch $z { 52 0 {set u "alpha"; unset x} 53 1 {set u "bravo"} 54 2 {set u "charlie"} 55 3 {set u "delta"; unset w} 56 } 57 if {$i%2} {set v $u} {set v [string toupper $u]} 58 db eval {INSERT INTO t1 VALUES($t,$u,$v,$w,$x,$y,$z)} 59 } 60 db eval { 61 CREATE INDEX t1t ON t1(t); -- 0.5, 1.5, 2.5, and 3.5 62 CREATE INDEX t1u ON t1(u); -- text 63 CREATE INDEX t1v ON t1(v); -- mixed case text 64 CREATE INDEX t1w ON t1(w); -- integers 0, 1, 2 and a few NULLs 65 CREATE INDEX t1x ON t1(x); -- integers 1, 2, 3 and many NULLs 66 CREATE INDEX t1y ON t1(y); -- integers 0 and very few 1s 67 CREATE INDEX t1z ON t1(z); -- integers 0, 1, 2, and 3 68 ANALYZE; 69 } 70 db eval { 71 SELECT DISTINCT lindex(test_decode(sample),0) 72 FROM sqlite_stat4 WHERE idx='t1u' ORDER BY nlt; 73 } 74 } {alpha bravo charlie delta} 75 76 do_test analyze5-1.1 { 77 db eval { 78 SELECT DISTINCT lower(lindex(test_decode(sample), 0)) 79 FROM sqlite_stat4 WHERE idx='t1v' ORDER BY 1 80 } 81 } {alpha bravo charlie delta} 82 do_test analyze5-1.2 { 83 db eval {SELECT idx, count(*) FROM sqlite_stat4 GROUP BY 1 ORDER BY 1} 84 } {t1t 8 t1u 8 t1v 8 t1w 8 t1x 8 t1y 9 t1z 8} 85 86 # Verify that range queries generate the correct row count estimates 87 # 88 foreach {testid where index rows} { 89 1 {z>=0 AND z<=0} t1z 400 90 2 {z>=1 AND z<=1} t1z 300 91 3 {z>=2 AND z<=2} t1z 175 92 4 {z>=3 AND z<=3} t1z 125 93 5 {z>=4 AND z<=4} t1z 1 94 6 {z>=-1 AND z<=-1} t1z 1 95 7 {z>1 AND z<3} t1z 175 96 8 {z>0 AND z<100} t1z 600 97 9 {z>=1 AND z<100} t1z 600 98 10 {z>1 AND z<100} t1z 300 99 11 {z>=2 AND z<100} t1z 300 100 12 {z>2 AND z<100} t1z 125 101 13 {z>=3 AND z<100} t1z 125 102 14 {z>3 AND z<100} t1z 1 103 15 {z>=4 AND z<100} t1z 1 104 16 {z>=-100 AND z<=-1} t1z 1 105 17 {z>=-100 AND z<=0} t1z 400 106 18 {z>=-100 AND z<0} t1z 1 107 19 {z>=-100 AND z<=1} t1z 700 108 20 {z>=-100 AND z<2} t1z 700 109 21 {z>=-100 AND z<=2} t1z 875 110 22 {z>=-100 AND z<3} t1z 875 111 112 31 {z>=0.0 AND z<=0.0} t1z 400 113 32 {z>=1.0 AND z<=1.0} t1z 300 114 33 {z>=2.0 AND z<=2.0} t1z 175 115 34 {z>=3.0 AND z<=3.0} t1z 125 116 35 {z>=4.0 AND z<=4.0} t1z 1 117 36 {z>=-1.0 AND z<=-1.0} t1z 1 118 37 {z>1.5 AND z<3.0} t1z 174 119 38 {z>0.5 AND z<100} t1z 599 120 39 {z>=1.0 AND z<100} t1z 600 121 40 {z>1.5 AND z<100} t1z 299 122 41 {z>=2.0 AND z<100} t1z 300 123 42 {z>2.1 AND z<100} t1z 124 124 43 {z>=3.0 AND z<100} t1z 125 125 44 {z>3.2 AND z<100} t1z 1 126 45 {z>=4.0 AND z<100} t1z 1 127 46 {z>=-100 AND z<=-1.0} t1z 1 128 47 {z>=-100 AND z<=0.0} t1z 400 129 48 {z>=-100 AND z<0.0} t1z 1 130 49 {z>=-100 AND z<=1.0} t1z 700 131 50 {z>=-100 AND z<2.0} t1z 700 132 51 {z>=-100 AND z<=2.0} t1z 875 133 52 {z>=-100 AND z<3.0} t1z 875 134 135 101 {z=-1} t1z 1 136 102 {z=0} t1z 400 137 103 {z=1} t1z 300 138 104 {z=2} t1z 175 139 105 {z=3} t1z 125 140 106 {z=4} t1z 1 141 107 {z=-10.0} t1z 1 142 108 {z=0.0} t1z 400 143 109 {z=1.0} t1z 300 144 110 {z=2.0} t1z 175 145 111 {z=3.0} t1z 125 146 112 {z=4.0} t1z 1 147 113 {z=1.5} t1z 1 148 114 {z=2.5} t1z 1 149 150 201 {z IN (-1)} t1z 1 151 202 {z IN (0)} t1z 400 152 203 {z IN (1)} t1z 300 153 204 {z IN (2)} t1z 175 154 205 {z IN (3)} t1z 125 155 206 {z IN (4)} t1z 1 156 207 {z IN (0.5)} t1z 1 157 208 {z IN (0,1)} t1z 700 158 209 {z IN (0,1,2)} t1z 875 159 210 {z IN (0,1,2,3)} {} 100 160 211 {z IN (0,1,2,3,4,5)} {} 100 161 212 {z IN (1,2)} t1z 475 162 213 {z IN (2,3)} t1z 300 163 214 {z=3 OR z=2} t1z 300 164 215 {z IN (-1,3)} t1z 126 165 216 {z=-1 OR z=3} t1z 126 166 167 300 {y=0} t1y 974 168 301 {y=1} t1y 26 169 302 {y=0.1} t1y 1 170 171 400 {x IS NULL} t1x 400 172 173 } { 174 # Verify that the expected index is used with the expected row count 175 # No longer valid due to an EXPLAIN QUERY PLAN output format change 176 # do_test analyze5-1.${testid}a { 177 # set x [lindex [eqp "SELECT * FROM t1 WHERE $where"] 3] 178 # set idx {} 179 # regexp {INDEX (t1.) } $x all idx 180 # regexp {~([0-9]+) rows} $x all nrow 181 # list $idx $nrow 182 # } [list $index $rows] 183 184 # Verify that the same result is achieved regardless of whether or not 185 # the index is used 186 do_test analyze5-1.${testid}b { 187 set w2 [string map {y +y z +z} $where] 188 set a1 [db eval "SELECT rowid FROM t1 NOT INDEXED WHERE $w2\ 189 ORDER BY +rowid"] 190 set a2 [db eval "SELECT rowid FROM t1 WHERE $where ORDER BY +rowid"] 191 if {$a1==$a2} { 192 set res ok 193 } else { 194 set res "a1=\[$a1\] a2=\[$a2\]" 195 } 196 set res 197 } {ok} 198 } 199 200 # Increase the number of NULLs in column x 201 # 202 db eval { 203 UPDATE t1 SET x=NULL; 204 UPDATE t1 SET x=rowid 205 WHERE rowid IN (SELECT rowid FROM t1 ORDER BY random() LIMIT 5); 206 ANALYZE; 207 } 208 209 # Verify that range queries generate the correct row count estimates 210 # 211 foreach {testid where index rows} { 212 500 {x IS NULL AND u='charlie'} t1u 17 213 501 {x=1 AND u='charlie'} t1x 1 214 502 {x IS NULL} t1x 995 215 503 {x=1} t1x 1 216 504 {x IS NOT NULL} t1x 2 217 505 {+x IS NOT NULL} {} 500 218 506 {upper(x) IS NOT NULL} {} 500 219 220 } { 221 # Verify that the expected index is used with the expected row count 222 # No longer valid due to an EXPLAIN QUERY PLAN format change 223 # do_test analyze5-1.${testid}a { 224 # set x [lindex [eqp "SELECT * FROM t1 WHERE $where"] 3] 225 # set idx {} 226 # regexp {INDEX (t1.) } $x all idx 227 # regexp {~([0-9]+) rows} $x all nrow 228 # list $idx $nrow 229 # } [list $index $rows] 230 231 # Verify that the same result is achieved regardless of whether or not 232 # the index is used 233 do_test analyze5-1.${testid}b { 234 set w2 [string map {y +y z +z} $where] 235 set a1 [db eval "SELECT rowid FROM t1 NOT INDEXED WHERE $w2\ 236 ORDER BY +rowid"] 237 set a2 [db eval "SELECT rowid FROM t1 WHERE $where ORDER BY +rowid"] 238 if {$a1==$a2} { 239 set res ok 240 } else { 241 set res "a1=\[$a1\] a2=\[$a2\]" 242 } 243 set res 244 } {ok} 245 } 246 247 finish_test