# 2011 July 1 # # 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 regression tests for SQLite library. The # focus of this script is the DISTINCT modifier. # set testdir [file dirname $argv0] source $testdir/tester.tcl set testprefix distinct proc is_distinct_noop {sql} { set sql1 $sql set sql2 [string map {DISTINCT ""} $sql] set program1 [list] set program2 [list] db eval "EXPLAIN $sql1" { if {$opcode != "Noop"} { lappend program1 $opcode } } db eval "EXPLAIN $sql2" { if {$opcode != "Noop"} { lappend program2 $opcode } } return [expr {$program1==$program2}] } proc do_distinct_noop_test {tn sql} { uplevel [list do_test $tn [list is_distinct_noop $sql] 1] } proc do_distinct_not_noop_test {tn sql} { uplevel [list do_test $tn [list is_distinct_noop $sql] 0] } proc do_temptables_test {tn sql temptables} { uplevel [list do_test $tn [subst -novar { set ret "" db eval "EXPLAIN [set sql]" { if {$opcode == "OpenEphemeral"} { if {$p5 != "10" && $p5!="00"} { error "p5 = $p5" } if {$p5 == "10"} { lappend ret hash } else { lappend ret btree } } } set ret }] $temptables] } #------------------------------------------------------------------------- # The following tests - distinct-1.* - check that the planner correctly # detects cases where a UNIQUE index means that a DISTINCT clause is # redundant. Currently the planner only detects such cases when there # is a single table in the FROM clause. # do_execsql_test 1.0 { CREATE TABLE t1(a, b, c, d); CREATE UNIQUE INDEX i1 ON t1(b, c); CREATE UNIQUE INDEX i2 ON t1(d COLLATE nocase); CREATE TABLE t2(x INTEGER PRIMARY KEY, y); CREATE TABLE t3(c1 PRIMARY KEY, c2); CREATE INDEX i3 ON t3(c2); } foreach {tn noop sql} { 1 1 "SELECT DISTINCT b, c FROM t1" 2 1 "SELECT DISTINCT c FROM t1 WHERE b = ?" 3 1 "SELECT DISTINCT rowid FROM t1" 4 1 "SELECT DISTINCT rowid, a FROM t1" 5 1 "SELECT DISTINCT x FROM t2" 6 1 "SELECT DISTINCT * FROM t2" 7 1 "SELECT DISTINCT * FROM (SELECT * FROM t2)" 8 1 "SELECT DISTINCT * FROM t1" 8 0 "SELECT DISTINCT a, b FROM t1" 9 0 "SELECT DISTINCT c FROM t1 WHERE b IN (1,2)" 10 0 "SELECT DISTINCT c FROM t1" 11 0 "SELECT DISTINCT b FROM t1" 12 0 "SELECT DISTINCT a, d FROM t1" 13 0 "SELECT DISTINCT a, b, c COLLATE nocase FROM t1" 14 1 "SELECT DISTINCT a, d COLLATE nocase FROM t1" 15 0 "SELECT DISTINCT a, d COLLATE binary FROM t1" 16 1 "SELECT DISTINCT a, b, c COLLATE binary FROM t1" 16 0 "SELECT DISTINCT t1.rowid FROM t1, t2" 17 0 { /* Technically, it would be possible to detect that DISTINCT ** is a no-op in cases like the following. But SQLite does not ** do so. */ SELECT DISTINCT t1.rowid FROM t1, t2 WHERE t1.rowid=t2.rowid } 18 1 "SELECT DISTINCT c1, c2 FROM t3" 19 1 "SELECT DISTINCT c1 FROM t3" 20 1 "SELECT DISTINCT * FROM t3" 21 0 "SELECT DISTINCT c2 FROM t3" 22 0 "SELECT DISTINCT * FROM (SELECT 1, 2, 3 UNION SELECT 4, 5, 6)" 23 1 "SELECT DISTINCT rowid FROM (SELECT 1, 2, 3 UNION SELECT 4, 5, 6)" 24 0 "SELECT DISTINCT rowid/2 FROM t1" 25 1 "SELECT DISTINCT rowid/2, rowid FROM t1" 26 1 "SELECT DISTINCT rowid/2, b FROM t1 WHERE c = ?" } { if {$noop} { do_distinct_noop_test 1.$tn $sql } else { do_distinct_not_noop_test 1.$tn $sql } } #------------------------------------------------------------------------- # The following tests - distinct-2.* - test cases where an index is # used to deliver results in order of the DISTINCT expressions. # drop_all_tables do_execsql_test 2.0 { CREATE TABLE t1(a, b, c); CREATE INDEX i1 ON t1(a, b); CREATE INDEX i2 ON t1(b COLLATE nocase, c COLLATE nocase); INSERT INTO t1 VALUES('a', 'b', 'c'); INSERT INTO t1 VALUES('A', 'B', 'C'); INSERT INTO t1 VALUES('a', 'b', 'c'); INSERT INTO t1 VALUES('A', 'B', 'C'); } foreach {tn sql temptables res} { 1 "a, b FROM t1" {} {A B a b} 2 "b, a FROM t1" {} {B A b a} 3 "a, b, c FROM t1" {hash} {a b c A B C} 4 "a, b, c FROM t1 ORDER BY a, b, c" {btree} {A B C a b c} 5 "b FROM t1 WHERE a = 'a'" {} {b} 6 "b FROM t1" {hash} {b B} 7 "a FROM t1" {} {A a} 8 "b COLLATE nocase FROM t1" {} {b} 9 "b COLLATE nocase FROM t1 ORDER BY b COLLATE nocase" {} {B} } { do_execsql_test 2.$tn.1 "SELECT DISTINCT $sql" $res do_temptables_test 2.$tn.2 "SELECT DISTINCT $sql" $temptables } do_execsql_test 2.A { SELECT (SELECT DISTINCT o.a FROM t1 AS i) FROM t1 AS o; } {a A a A} finish_test