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# 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
ifcapable !compound {
finish_test
return
}
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" || $opcode == "SorterOpen"} {
if {$p5 != "08" && $p5!="00"} { error "p5 = $p5" }
if {$p5 == "08"} {
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 NOT NULL, c2 NOT NULL);
CREATE INDEX i3 ON t3(c2);
CREATE TABLE t4(a, b NOT NULL, c NOT NULL, d NOT NULL);
CREATE UNIQUE INDEX t4i1 ON t4(b, c);
CREATE UNIQUE INDEX t4i2 ON t4(d COLLATE nocase);
}
foreach {tn noop sql} {
1.1 0 "SELECT DISTINCT b, c FROM t1"
1.2 1 "SELECT DISTINCT b, c FROM t4"
2.1 0 "SELECT DISTINCT c FROM t1 WHERE b = ?"
2.2 1 "SELECT DISTINCT c FROM t4 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 0 "SELECT DISTINCT * FROM t1"
8.2 1 "SELECT DISTINCT * FROM t4"
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"
12.1 0 "SELECT DISTINCT a, d FROM t1"
12.2 0 "SELECT DISTINCT a, d FROM t4"
13.1 0 "SELECT DISTINCT a, b, c COLLATE nocase FROM t1"
13.2 0 "SELECT DISTINCT a, b, c COLLATE nocase FROM t4"
14.1 0 "SELECT DISTINCT a, d COLLATE nocase FROM t1"
14.2 1 "SELECT DISTINCT a, d COLLATE nocase FROM t4"
15 0 "SELECT DISTINCT a, d COLLATE binary FROM t1"
16.1 0 "SELECT DISTINCT a, b, c COLLATE binary FROM t1"
16.2 1 "SELECT DISTINCT a, b, c COLLATE binary FROM t4"
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 0 "SELECT DISTINCT rowid/2, b FROM t1 WHERE c = ?"
26.2 1 "SELECT DISTINCT rowid/2, b FROM t4 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 ORDER BY rowid;
} {a A a A}
do_test 3.0 {
db eval {
CREATE TABLE t3(a INTEGER, b INTEGER, c, UNIQUE(a,b));
INSERT INTO t3 VALUES
(null, null, 1),
(null, null, 2),
(null, 3, 4),
(null, 3, 5),
(6, null, 7),
(6, null, 8);
SELECT DISTINCT a, b FROM t3 ORDER BY +a, +b;
}
} {{} {} {} 3 6 {}}
do_test 3.1 {
regexp {OpenEphemeral} [db eval {
EXPLAIN SELECT DISTINCT a, b FROM t3 ORDER BY +a, +b;
}]
} {0}
finish_test
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