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248 lines
7.7 KiB
Plaintext
248 lines
7.7 KiB
Plaintext
# 2011 January 19
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# This file implements tests for SQLite library. The focus of the tests
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# in this file is the use of the sqlite_stat4 histogram data on tables
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# with many repeated values and only a few distinct values.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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ifcapable !stat4 {
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finish_test
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return
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}
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set testprefix analyze5
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proc eqp {sql {db db}} {
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uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db
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}
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proc alpha {blob} {
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set ret ""
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foreach c [split $blob {}] {
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if {[string is alpha $c]} {append ret $c}
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}
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return $ret
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}
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db func alpha alpha
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db func lindex lindex
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unset -nocomplain i t u v w x y z
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do_test analyze5-1.0 {
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db eval {CREATE TABLE t1(t,u,v TEXT COLLATE nocase,w,x,y,z)}
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for {set i 0} {$i < 1000} {incr i} {
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set y [expr {$i>=25 && $i<=50}]
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set z [expr {($i>=400) + ($i>=700) + ($i>=875)}]
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set x $z
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set w $z
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set t [expr {$z+0.5}]
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switch $z {
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0 {set u "alpha"; unset x}
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1 {set u "bravo"}
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2 {set u "charlie"}
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3 {set u "delta"; unset w}
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}
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if {$i%2} {set v $u} {set v [string toupper $u]}
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db eval {INSERT INTO t1 VALUES($t,$u,$v,$w,$x,$y,$z)}
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}
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db eval {
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CREATE INDEX t1t ON t1(t); -- 0.5, 1.5, 2.5, and 3.5
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CREATE INDEX t1u ON t1(u); -- text
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CREATE INDEX t1v ON t1(v); -- mixed case text
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CREATE INDEX t1w ON t1(w); -- integers 0, 1, 2 and a few NULLs
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CREATE INDEX t1x ON t1(x); -- integers 1, 2, 3 and many NULLs
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CREATE INDEX t1y ON t1(y); -- integers 0 and very few 1s
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CREATE INDEX t1z ON t1(z); -- integers 0, 1, 2, and 3
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ANALYZE;
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}
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db eval {
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SELECT DISTINCT lindex(test_decode(sample),0)
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FROM sqlite_stat4 WHERE idx='t1u' ORDER BY nlt;
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}
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} {alpha bravo charlie delta}
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do_test analyze5-1.1 {
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db eval {
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SELECT DISTINCT lower(lindex(test_decode(sample), 0))
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FROM sqlite_stat4 WHERE idx='t1v' ORDER BY 1
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}
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} {alpha bravo charlie delta}
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do_test analyze5-1.2 {
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db eval {SELECT idx, count(*) FROM sqlite_stat4 GROUP BY 1 ORDER BY 1}
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} {t1t 8 t1u 8 t1v 8 t1w 8 t1x 8 t1y 9 t1z 8}
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# Verify that range queries generate the correct row count estimates
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#
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foreach {testid where index rows} {
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1 {z>=0 AND z<=0} t1z 400
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2 {z>=1 AND z<=1} t1z 300
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3 {z>=2 AND z<=2} t1z 175
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4 {z>=3 AND z<=3} t1z 125
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5 {z>=4 AND z<=4} t1z 1
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6 {z>=-1 AND z<=-1} t1z 1
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7 {z>1 AND z<3} t1z 175
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8 {z>0 AND z<100} t1z 600
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9 {z>=1 AND z<100} t1z 600
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10 {z>1 AND z<100} t1z 300
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11 {z>=2 AND z<100} t1z 300
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12 {z>2 AND z<100} t1z 125
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13 {z>=3 AND z<100} t1z 125
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14 {z>3 AND z<100} t1z 1
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15 {z>=4 AND z<100} t1z 1
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16 {z>=-100 AND z<=-1} t1z 1
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17 {z>=-100 AND z<=0} t1z 400
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18 {z>=-100 AND z<0} t1z 1
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19 {z>=-100 AND z<=1} t1z 700
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20 {z>=-100 AND z<2} t1z 700
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21 {z>=-100 AND z<=2} t1z 875
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22 {z>=-100 AND z<3} t1z 875
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31 {z>=0.0 AND z<=0.0} t1z 400
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32 {z>=1.0 AND z<=1.0} t1z 300
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33 {z>=2.0 AND z<=2.0} t1z 175
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34 {z>=3.0 AND z<=3.0} t1z 125
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35 {z>=4.0 AND z<=4.0} t1z 1
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36 {z>=-1.0 AND z<=-1.0} t1z 1
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37 {z>1.5 AND z<3.0} t1z 174
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38 {z>0.5 AND z<100} t1z 599
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39 {z>=1.0 AND z<100} t1z 600
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40 {z>1.5 AND z<100} t1z 299
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41 {z>=2.0 AND z<100} t1z 300
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42 {z>2.1 AND z<100} t1z 124
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43 {z>=3.0 AND z<100} t1z 125
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44 {z>3.2 AND z<100} t1z 1
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45 {z>=4.0 AND z<100} t1z 1
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46 {z>=-100 AND z<=-1.0} t1z 1
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47 {z>=-100 AND z<=0.0} t1z 400
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48 {z>=-100 AND z<0.0} t1z 1
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49 {z>=-100 AND z<=1.0} t1z 700
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50 {z>=-100 AND z<2.0} t1z 700
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51 {z>=-100 AND z<=2.0} t1z 875
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52 {z>=-100 AND z<3.0} t1z 875
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101 {z=-1} t1z 1
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102 {z=0} t1z 400
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103 {z=1} t1z 300
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104 {z=2} t1z 175
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105 {z=3} t1z 125
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106 {z=4} t1z 1
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107 {z=-10.0} t1z 1
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108 {z=0.0} t1z 400
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109 {z=1.0} t1z 300
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110 {z=2.0} t1z 175
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111 {z=3.0} t1z 125
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112 {z=4.0} t1z 1
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113 {z=1.5} t1z 1
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114 {z=2.5} t1z 1
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201 {z IN (-1)} t1z 1
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202 {z IN (0)} t1z 400
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203 {z IN (1)} t1z 300
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204 {z IN (2)} t1z 175
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205 {z IN (3)} t1z 125
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206 {z IN (4)} t1z 1
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207 {z IN (0.5)} t1z 1
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208 {z IN (0,1)} t1z 700
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209 {z IN (0,1,2)} t1z 875
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210 {z IN (0,1,2,3)} {} 100
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211 {z IN (0,1,2,3,4,5)} {} 100
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212 {z IN (1,2)} t1z 475
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213 {z IN (2,3)} t1z 300
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214 {z=3 OR z=2} t1z 300
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215 {z IN (-1,3)} t1z 126
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216 {z=-1 OR z=3} t1z 126
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300 {y=0} t1y 974
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301 {y=1} t1y 26
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302 {y=0.1} t1y 1
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400 {x IS NULL} t1x 400
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} {
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# Verify that the expected index is used with the expected row count
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# No longer valid due to an EXPLAIN QUERY PLAN output format change
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# do_test analyze5-1.${testid}a {
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# set x [lindex [eqp "SELECT * FROM t1 WHERE $where"] 3]
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# set idx {}
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# regexp {INDEX (t1.) } $x all idx
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# regexp {~([0-9]+) rows} $x all nrow
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# list $idx $nrow
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# } [list $index $rows]
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# Verify that the same result is achieved regardless of whether or not
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# the index is used
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do_test analyze5-1.${testid}b {
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set w2 [string map {y +y z +z} $where]
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set a1 [db eval "SELECT rowid FROM t1 NOT INDEXED WHERE $w2\
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ORDER BY +rowid"]
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set a2 [db eval "SELECT rowid FROM t1 WHERE $where ORDER BY +rowid"]
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if {$a1==$a2} {
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set res ok
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} else {
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set res "a1=\[$a1\] a2=\[$a2\]"
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}
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set res
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} {ok}
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}
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# Increase the number of NULLs in column x
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#
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db eval {
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UPDATE t1 SET x=NULL;
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UPDATE t1 SET x=rowid
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WHERE rowid IN (SELECT rowid FROM t1 ORDER BY random() LIMIT 5);
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ANALYZE;
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}
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# Verify that range queries generate the correct row count estimates
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#
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foreach {testid where index rows} {
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500 {x IS NULL AND u='charlie'} t1u 17
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501 {x=1 AND u='charlie'} t1x 1
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502 {x IS NULL} t1x 995
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503 {x=1} t1x 1
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504 {x IS NOT NULL} t1x 2
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505 {+x IS NOT NULL} {} 500
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506 {upper(x) IS NOT NULL} {} 500
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} {
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# Verify that the expected index is used with the expected row count
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# No longer valid due to an EXPLAIN QUERY PLAN format change
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# do_test analyze5-1.${testid}a {
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# set x [lindex [eqp "SELECT * FROM t1 WHERE $where"] 3]
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# set idx {}
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# regexp {INDEX (t1.) } $x all idx
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# regexp {~([0-9]+) rows} $x all nrow
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# list $idx $nrow
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# } [list $index $rows]
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# Verify that the same result is achieved regardless of whether or not
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# the index is used
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do_test analyze5-1.${testid}b {
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set w2 [string map {y +y z +z} $where]
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set a1 [db eval "SELECT rowid FROM t1 NOT INDEXED WHERE $w2\
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ORDER BY +rowid"]
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set a2 [db eval "SELECT rowid FROM t1 WHERE $where ORDER BY +rowid"]
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if {$a1==$a2} {
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set res ok
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} else {
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set res "a1=\[$a1\] a2=\[$a2\]"
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}
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set res
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} {ok}
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}
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finish_test
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