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| -rw-r--r-- | test/analyze5.test | 247 |
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diff --git a/test/analyze5.test b/test/analyze5.test new file mode 100644 index 0000000..e58457a --- /dev/null +++ b/test/analyze5.test @@ -0,0 +1,247 @@ +# 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_stat4 histogram data on tables +# with many repeated values and only a few distinct values. +# + +set testdir [file dirname $argv0] +source $testdir/tester.tcl + +ifcapable !stat4 { + finish_test + return +} + +set testprefix analyze5 + +proc eqp {sql {db db}} { + uplevel execsql [list "EXPLAIN QUERY PLAN $sql"] $db +} + +proc alpha {blob} { + set ret "" + foreach c [split $blob {}] { + if {[string is alpha $c]} {append ret $c} + } + return $ret +} +db func alpha alpha + +db func lindex lindex + +unset -nocomplain i t u v w x y z +do_test analyze5-1.0 { + db eval {CREATE TABLE t1(t,u,v TEXT COLLATE nocase,w,x,y,z)} + for {set i 0} {$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; + } + db eval { + SELECT DISTINCT lindex(test_decode(sample),0) + FROM sqlite_stat4 WHERE idx='t1u' ORDER BY nlt; + } +} {alpha bravo charlie delta} + +do_test analyze5-1.1 { + db eval { + SELECT DISTINCT lower(lindex(test_decode(sample), 0)) + FROM sqlite_stat4 WHERE idx='t1v' ORDER BY 1 + } +} {alpha bravo charlie delta} +do_test analyze5-1.2 { + db eval {SELECT idx, count(*) FROM sqlite_stat4 GROUP BY 1 ORDER BY 1} +} {t1t 8 t1u 8 t1v 8 t1w 8 t1x 8 t1y 9 t1z 8} + +# 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 + # No longer valid due to an EXPLAIN QUERY PLAN output format change + # 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 + # No longer valid due to an EXPLAIN QUERY PLAN format change + # 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 |