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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" && $opcode != "Explain"} { lappend program1 $opcode }
+ }
+ db eval "EXPLAIN $sql2" {
+ if {$opcode != "Noop" && $opcode != "Explain"} { 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!=8 && $p5!=0} { error "p5 = $p5" }
+ if {$p5==8} {
+ 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)"
+
+ 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 $sql
+ }
+}
+
+#-------------------------------------------------------------------------
+# The following tests - distinct-2.* - test cases where an index is
+# used to deliver results in order of the DISTINCT expressions.
+#
+drop_all_tables
+do_execsql_test 2.0 {
+ CREATE TABLE t1(a, b, c);
+
+ CREATE INDEX i1 ON t1(a, b);
+ CREATE INDEX i2 ON t1(b COLLATE nocase, c COLLATE nocase);
+
+ INSERT INTO t1 VALUES('a', 'b', 'c');
+ INSERT INTO t1 VALUES('A', 'B', 'C');
+ INSERT INTO t1 VALUES('a', 'b', 'c');
+ INSERT INTO t1 VALUES('A', 'B', 'C');
+}
+
+foreach {tn sql temptables res} {
+ 1 "a, b FROM t1" {} {A B a b}
+ 2 "b, a FROM t1" {} {B A b a}
+ 3 "a, b, c FROM t1" {hash} {A B C a b c}
+ 4 "a, b, c FROM t1 ORDER BY a, b, c" {btree} {A B C a b c}
+ 5 "b FROM t1 WHERE a = 'a'" {} {b}
+ 6 "b FROM t1 ORDER BY +b COLLATE binary" {btree hash} {B b}
+ 7 "a FROM t1" {} {A a}
+ 8 "b COLLATE nocase FROM t1" {} {b}
+ 9 "b COLLATE nocase FROM t1 ORDER BY b COLLATE nocase" {} {b}
+} {
+ do_execsql_test 2.$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}
+
+#-------------------------------------------------------------------------
+# Ticket [fccbde530a6583bf2748400919f1603d5425995c] (2014-01-08)
+# The logic that computes DISTINCT sometimes thinks that a zeroblob()
+# and a blob of all zeros are different when they should be the same.
+#
+do_execsql_test 4.1 {
+ DROP TABLE IF EXISTS t1;
+ DROP TABLE IF EXISTS t2;
+ CREATE TABLE t1(a INTEGER);
+ INSERT INTO t1 VALUES(3);
+ INSERT INTO t1 VALUES(2);
+ INSERT INTO t1 VALUES(1);
+ INSERT INTO t1 VALUES(2);
+ INSERT INTO t1 VALUES(3);
+ INSERT INTO t1 VALUES(1);
+ CREATE TABLE t2(x);
+ INSERT INTO t2
+ SELECT DISTINCT
+ CASE a WHEN 1 THEN x'0000000000'
+ WHEN 2 THEN zeroblob(5)
+ ELSE 'xyzzy' END
+ FROM t1;
+ SELECT quote(x) FROM t2 ORDER BY 1;
+} {'xyzzy' X'0000000000'}
+
+#----------------------------------------------------------------------------
+# Ticket [c5ea805691bfc4204b1cb9e9aa0103bd48bc7d34] (2014-12-04)
+# Make sure that DISTINCT works together with ORDER BY and descending
+# indexes.
+#
+do_execsql_test 5.1 {
+ DROP TABLE IF EXISTS t1;
+ CREATE TABLE t1(x);
+ INSERT INTO t1(x) VALUES(3),(1),(5),(2),(6),(4),(5),(1),(3);
+ CREATE INDEX t1x ON t1(x DESC);
+ SELECT DISTINCT x FROM t1 ORDER BY x ASC;
+} {1 2 3 4 5 6}
+do_execsql_test 5.2 {
+ SELECT DISTINCT x FROM t1 ORDER BY x DESC;
+} {6 5 4 3 2 1}
+do_execsql_test 5.3 {
+ SELECT DISTINCT x FROM t1 ORDER BY x;
+} {1 2 3 4 5 6}
+do_execsql_test 5.4 {
+ DROP INDEX t1x;
+ CREATE INDEX t1x ON t1(x ASC);
+ SELECT DISTINCT x FROM t1 ORDER BY x ASC;
+} {1 2 3 4 5 6}
+do_execsql_test 5.5 {
+ SELECT DISTINCT x FROM t1 ORDER BY x DESC;
+} {6 5 4 3 2 1}
+do_execsql_test 5.6 {
+ SELECT DISTINCT x FROM t1 ORDER BY x;
+} {1 2 3 4 5 6}
+
+#-------------------------------------------------------------------------
+# 2015-11-23. Problem discovered by Kostya Serebryany using libFuzzer
+#
+db close
+sqlite3 db :memory:
+do_execsql_test 6.1 {
+ CREATE TABLE jjj(x);
+ SELECT (SELECT 'mmm' UNION SELECT DISTINCT max(name) ORDER BY 1)
+ FROM sqlite_master;
+} {jjj}
+do_execsql_test 6.2 {
+ CREATE TABLE nnn(x);
+ SELECT (SELECT 'mmm' UNION SELECT DISTINCT max(name) ORDER BY 1)
+ FROM sqlite_master;
+} {mmm}
+
+#-------------------------------------------------------------------------
+# Ticket [9c944882]
+#
+reset_db
+do_execsql_test 7.0 {
+ CREATE TABLE t1(a INTEGER PRIMARY KEY);
+ CREATE TABLE t3(a INTEGER PRIMARY KEY);
+
+ CREATE TABLE t4(x);
+ CREATE TABLE t5(y);
+
+ INSERT INTO t5 VALUES(1), (2), (2);
+ INSERT INTO t1 VALUES(2);
+ INSERT INTO t3 VALUES(2);
+ INSERT INTO t4 VALUES(2);
+}
+
+do_execsql_test 7.1 {
+ WITH t2(b) AS (
+ SELECT DISTINCT y FROM t5 ORDER BY y
+ )
+ SELECT * FROM
+ t4 CROSS JOIN t3 CROSS JOIN t1
+ WHERE (t1.a=t3.a) AND (SELECT count(*) FROM t2 AS y WHERE t4.x!='abc')=t1.a
+} {2 2 2}
+
+# 2021-04-06 forum post https://sqlite.org/forum/forumpost/66954e9ece
+reset_db
+do_execsql_test 8.0 {
+ CREATE TABLE person ( pid INT) ;
+ CREATE UNIQUE INDEX idx ON person ( pid ) WHERE pid == 1;
+ INSERT INTO person VALUES (1), (10), (10);
+ SELECT DISTINCT pid FROM person where pid = 10;
+} {10}
+
+#-------------------------------------------------------------------------
+reset_db
+do_execsql_test 9.0 {
+ CREATE TABLE t1(a, b);
+ INSERT INTO t1 VALUES('a', 'a');
+ INSERT INTO t1 VALUES('a', 'b');
+ INSERT INTO t1 VALUES('a', 'c');
+
+ INSERT INTO t1 VALUES('b', 'a');
+ INSERT INTO t1 VALUES('b', 'b');
+ INSERT INTO t1 VALUES('b', 'c');
+
+ INSERT INTO t1 VALUES('a', 'a');
+ INSERT INTO t1 VALUES('b', 'b');
+
+ INSERT INTO t1 VALUES('A', 'A');
+ INSERT INTO t1 VALUES('B', 'B');
+}
+
+foreach {tn idx} {
+ 1 { }
+ 2 { CREATE INDEX i1 ON t1(a, b); }
+ 3 { CREATE INDEX i1 ON t1(b, a); }
+ 4 { CREATE INDEX i1 ON t1(a COLLATE nocase, b COLLATE nocase); }
+ 5 { CREATE INDEX i1 ON t1(b COLLATE nocase, a COLLATE nocase); }
+} {
+
+ execsql { DROP INDEX IF EXISTS i1 }
+ execsql $idx
+
+ do_execsql_test 9.$tn.1 {
+ SELECT DISTINCT a, b FROM t1 ORDER BY a, b
+ } {
+ A A B B
+ a a a b a c
+ b a b b b c
+ }
+
+ do_execsql_test 9.$tn.1 {
+ SELECT DISTINCT a COLLATE nocase, b COLLATE nocase FROM t1
+ ORDER BY a COLLATE nocase, b COLLATE nocase
+ } {
+ a a a b a c
+ b a b b b c
+ }
+}
+
+
+finish_test
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