1# 2011 July 1 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# This file implements regression tests for SQLite library. The 12# focus of this script is the DISTINCT modifier. 13# 14 15set testdir [file dirname $argv0] 16source $testdir/tester.tcl 17 18set testprefix distinct 19 20 21proc is_distinct_noop {sql} { 22 set sql1 $sql 23 set sql2 [string map {DISTINCT ""} $sql] 24 25 set program1 [list] 26 set program2 [list] 27 db eval "EXPLAIN $sql1" { 28 if {$opcode != "Noop"} { lappend program1 $opcode } 29 } 30 db eval "EXPLAIN $sql2" { 31 if {$opcode != "Noop"} { lappend program2 $opcode } 32 } 33 34 return [expr {$program1==$program2}] 35} 36 37proc do_distinct_noop_test {tn sql} { 38 uplevel [list do_test $tn [list is_distinct_noop $sql] 1] 39} 40proc do_distinct_not_noop_test {tn sql} { 41 uplevel [list do_test $tn [list is_distinct_noop $sql] 0] 42} 43 44proc do_temptables_test {tn sql temptables} { 45 uplevel [list do_test $tn [subst -novar { 46 set ret "" 47 db eval "EXPLAIN [set sql]" { 48 if {$opcode == "OpenEphemeral" || $opcode == "SorterOpen"} { 49 if {$p5 != "08" && $p5!="00"} { error "p5 = $p5" } 50 if {$p5 == "08"} { 51 lappend ret hash 52 } else { 53 lappend ret btree 54 } 55 } 56 } 57 set ret 58 }] $temptables] 59} 60 61 62#------------------------------------------------------------------------- 63# The following tests - distinct-1.* - check that the planner correctly 64# detects cases where a UNIQUE index means that a DISTINCT clause is 65# redundant. Currently the planner only detects such cases when there 66# is a single table in the FROM clause. 67# 68do_execsql_test 1.0 { 69 CREATE TABLE t1(a, b, c, d); 70 CREATE UNIQUE INDEX i1 ON t1(b, c); 71 CREATE UNIQUE INDEX i2 ON t1(d COLLATE nocase); 72 73 CREATE TABLE t2(x INTEGER PRIMARY KEY, y); 74 75 CREATE TABLE t3(c1 PRIMARY KEY, c2); 76 CREATE INDEX i3 ON t3(c2); 77} 78foreach {tn noop sql} { 79 80 1 1 "SELECT DISTINCT b, c FROM t1" 81 2 1 "SELECT DISTINCT c FROM t1 WHERE b = ?" 82 3 1 "SELECT DISTINCT rowid FROM t1" 83 4 1 "SELECT DISTINCT rowid, a FROM t1" 84 5 1 "SELECT DISTINCT x FROM t2" 85 6 1 "SELECT DISTINCT * FROM t2" 86 7 1 "SELECT DISTINCT * FROM (SELECT * FROM t2)" 87 88 8 1 "SELECT DISTINCT * FROM t1" 89 90 8 0 "SELECT DISTINCT a, b FROM t1" 91 92 9 0 "SELECT DISTINCT c FROM t1 WHERE b IN (1,2)" 93 10 0 "SELECT DISTINCT c FROM t1" 94 11 0 "SELECT DISTINCT b FROM t1" 95 96 12 0 "SELECT DISTINCT a, d FROM t1" 97 13 0 "SELECT DISTINCT a, b, c COLLATE nocase FROM t1" 98 14 1 "SELECT DISTINCT a, d COLLATE nocase FROM t1" 99 15 0 "SELECT DISTINCT a, d COLLATE binary FROM t1" 100 16 1 "SELECT DISTINCT a, b, c COLLATE binary FROM t1" 101 102 16 0 "SELECT DISTINCT t1.rowid FROM t1, t2" 103 17 0 { /* Technically, it would be possible to detect that DISTINCT 104 ** is a no-op in cases like the following. But SQLite does not 105 ** do so. */ 106 SELECT DISTINCT t1.rowid FROM t1, t2 WHERE t1.rowid=t2.rowid } 107 108 18 1 "SELECT DISTINCT c1, c2 FROM t3" 109 19 1 "SELECT DISTINCT c1 FROM t3" 110 20 1 "SELECT DISTINCT * FROM t3" 111 21 0 "SELECT DISTINCT c2 FROM t3" 112 113 22 0 "SELECT DISTINCT * FROM (SELECT 1, 2, 3 UNION SELECT 4, 5, 6)" 114 23 1 "SELECT DISTINCT rowid FROM (SELECT 1, 2, 3 UNION SELECT 4, 5, 6)" 115 116 24 0 "SELECT DISTINCT rowid/2 FROM t1" 117 25 1 "SELECT DISTINCT rowid/2, rowid FROM t1" 118 26 1 "SELECT DISTINCT rowid/2, b FROM t1 WHERE c = ?" 119} { 120 if {$noop} { 121 do_distinct_noop_test 1.$tn $sql 122 } else { 123 do_distinct_not_noop_test 1.$tn $sql 124 } 125} 126 127#------------------------------------------------------------------------- 128# The following tests - distinct-2.* - test cases where an index is 129# used to deliver results in order of the DISTINCT expressions. 130# 131drop_all_tables 132do_execsql_test 2.0 { 133 CREATE TABLE t1(a, b, c); 134 135 CREATE INDEX i1 ON t1(a, b); 136 CREATE INDEX i2 ON t1(b COLLATE nocase, c COLLATE nocase); 137 138 INSERT INTO t1 VALUES('a', 'b', 'c'); 139 INSERT INTO t1 VALUES('A', 'B', 'C'); 140 INSERT INTO t1 VALUES('a', 'b', 'c'); 141 INSERT INTO t1 VALUES('A', 'B', 'C'); 142} 143 144foreach {tn sql temptables res} { 145 1 "a, b FROM t1" {} {A B a b} 146 2 "b, a FROM t1" {} {B A b a} 147 3 "a, b, c FROM t1" {hash} {a b c A B C} 148 4 "a, b, c FROM t1 ORDER BY a, b, c" {btree} {A B C a b c} 149 5 "b FROM t1 WHERE a = 'a'" {} {b} 150 6 "b FROM t1" {hash} {b B} 151 7 "a FROM t1" {} {A a} 152 8 "b COLLATE nocase FROM t1" {} {b} 153 9 "b COLLATE nocase FROM t1 ORDER BY b COLLATE nocase" {} {B} 154} { 155 do_execsql_test 2.$tn.1 "SELECT DISTINCT $sql" $res 156 do_temptables_test 2.$tn.2 "SELECT DISTINCT $sql" $temptables 157} 158 159do_execsql_test 2.A { 160 SELECT (SELECT DISTINCT o.a FROM t1 AS i) FROM t1 AS o; 161} {a A a A} 162 163 164 165 166finish_test 167