201 lines
6.2 KiB
Plaintext
201 lines
6.2 KiB
Plaintext
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# 2011 July 1
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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# This file implements regression tests for SQLite library. The
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# focus of this script is the DISTINCT modifier.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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ifcapable !compound {
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finish_test
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return
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}
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set testprefix distinct
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proc is_distinct_noop {sql} {
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set sql1 $sql
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set sql2 [string map {DISTINCT ""} $sql]
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set program1 [list]
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set program2 [list]
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db eval "EXPLAIN $sql1" {
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if {$opcode != "Noop"} { lappend program1 $opcode }
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}
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db eval "EXPLAIN $sql2" {
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if {$opcode != "Noop"} { lappend program2 $opcode }
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}
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return [expr {$program1==$program2}]
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}
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proc do_distinct_noop_test {tn sql} {
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uplevel [list do_test $tn [list is_distinct_noop $sql] 1]
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}
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proc do_distinct_not_noop_test {tn sql} {
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uplevel [list do_test $tn [list is_distinct_noop $sql] 0]
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}
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proc do_temptables_test {tn sql temptables} {
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uplevel [list do_test $tn [subst -novar {
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set ret ""
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db eval "EXPLAIN [set sql]" {
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if {$opcode == "OpenEphemeral" || $opcode == "SorterOpen"} {
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if {$p5 != "08" && $p5!="00"} { error "p5 = $p5" }
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if {$p5 == "08"} {
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lappend ret hash
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} else {
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lappend ret btree
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}
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}
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}
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set ret
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}] $temptables]
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}
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#-------------------------------------------------------------------------
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# The following tests - distinct-1.* - check that the planner correctly
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# detects cases where a UNIQUE index means that a DISTINCT clause is
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# redundant. Currently the planner only detects such cases when there
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# is a single table in the FROM clause.
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#
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do_execsql_test 1.0 {
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CREATE TABLE t1(a, b, c, d);
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CREATE UNIQUE INDEX i1 ON t1(b, c);
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CREATE UNIQUE INDEX i2 ON t1(d COLLATE nocase);
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CREATE TABLE t2(x INTEGER PRIMARY KEY, y);
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CREATE TABLE t3(c1 PRIMARY KEY NOT NULL, c2 NOT NULL);
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CREATE INDEX i3 ON t3(c2);
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CREATE TABLE t4(a, b NOT NULL, c NOT NULL, d NOT NULL);
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CREATE UNIQUE INDEX t4i1 ON t4(b, c);
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CREATE UNIQUE INDEX t4i2 ON t4(d COLLATE nocase);
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}
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foreach {tn noop sql} {
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1.1 0 "SELECT DISTINCT b, c FROM t1"
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1.2 1 "SELECT DISTINCT b, c FROM t4"
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2.1 0 "SELECT DISTINCT c FROM t1 WHERE b = ?"
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2.2 1 "SELECT DISTINCT c FROM t4 WHERE b = ?"
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3 1 "SELECT DISTINCT rowid FROM t1"
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4 1 "SELECT DISTINCT rowid, a FROM t1"
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5 1 "SELECT DISTINCT x FROM t2"
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6 1 "SELECT DISTINCT * FROM t2"
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7 1 "SELECT DISTINCT * FROM (SELECT * FROM t2)"
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8.1 0 "SELECT DISTINCT * FROM t1"
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8.2 1 "SELECT DISTINCT * FROM t4"
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8 0 "SELECT DISTINCT a, b FROM t1"
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9 0 "SELECT DISTINCT c FROM t1 WHERE b IN (1,2)"
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10 0 "SELECT DISTINCT c FROM t1"
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11 0 "SELECT DISTINCT b FROM t1"
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12.1 0 "SELECT DISTINCT a, d FROM t1"
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12.2 0 "SELECT DISTINCT a, d FROM t4"
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13.1 0 "SELECT DISTINCT a, b, c COLLATE nocase FROM t1"
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13.2 0 "SELECT DISTINCT a, b, c COLLATE nocase FROM t4"
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14.1 0 "SELECT DISTINCT a, d COLLATE nocase FROM t1"
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14.2 1 "SELECT DISTINCT a, d COLLATE nocase FROM t4"
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15 0 "SELECT DISTINCT a, d COLLATE binary FROM t1"
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16.1 0 "SELECT DISTINCT a, b, c COLLATE binary FROM t1"
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16.2 1 "SELECT DISTINCT a, b, c COLLATE binary FROM t4"
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16 0 "SELECT DISTINCT t1.rowid FROM t1, t2"
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17 0 { /* Technically, it would be possible to detect that DISTINCT
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** is a no-op in cases like the following. But SQLite does not
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** do so. */
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SELECT DISTINCT t1.rowid FROM t1, t2 WHERE t1.rowid=t2.rowid }
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18 1 "SELECT DISTINCT c1, c2 FROM t3"
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19 1 "SELECT DISTINCT c1 FROM t3"
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20 1 "SELECT DISTINCT * FROM t3"
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21 0 "SELECT DISTINCT c2 FROM t3"
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22 0 "SELECT DISTINCT * FROM (SELECT 1, 2, 3 UNION SELECT 4, 5, 6)"
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23 1 "SELECT DISTINCT rowid FROM (SELECT 1, 2, 3 UNION SELECT 4, 5, 6)"
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24 0 "SELECT DISTINCT rowid/2 FROM t1"
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25 1 "SELECT DISTINCT rowid/2, rowid FROM t1"
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26.1 0 "SELECT DISTINCT rowid/2, b FROM t1 WHERE c = ?"
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26.2 1 "SELECT DISTINCT rowid/2, b FROM t4 WHERE c = ?"
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} {
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if {$noop} {
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do_distinct_noop_test 1.$tn $sql
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} else {
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do_distinct_not_noop_test 1.$tn $sql
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}
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}
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#-------------------------------------------------------------------------
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# The following tests - distinct-2.* - test cases where an index is
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# used to deliver results in order of the DISTINCT expressions.
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#
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drop_all_tables
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do_execsql_test 2.0 {
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CREATE TABLE t1(a, b, c);
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CREATE INDEX i1 ON t1(a, b);
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CREATE INDEX i2 ON t1(b COLLATE nocase, c COLLATE nocase);
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INSERT INTO t1 VALUES('a', 'b', 'c');
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INSERT INTO t1 VALUES('A', 'B', 'C');
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INSERT INTO t1 VALUES('a', 'b', 'c');
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INSERT INTO t1 VALUES('A', 'B', 'C');
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}
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foreach {tn sql temptables res} {
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1 "a, b FROM t1" {} {A B a b}
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2 "b, a FROM t1" {} {B A b a}
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3 "a, b, c FROM t1" {hash} {a b c A B C}
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4 "a, b, c FROM t1 ORDER BY a, b, c" {btree} {A B C a b c}
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5 "b FROM t1 WHERE a = 'a'" {} {b}
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6 "b FROM t1 ORDER BY +b COLLATE binary" {btree hash} {B b}
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7 "a FROM t1" {} {A a}
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8 "b COLLATE nocase FROM t1" {} {b}
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9 "b COLLATE nocase FROM t1 ORDER BY b COLLATE nocase" {} {b}
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} {
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do_execsql_test 2.$tn.1 "SELECT DISTINCT $sql" $res
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do_temptables_test 2.$tn.2 "SELECT DISTINCT $sql" $temptables
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}
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do_execsql_test 2.A {
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SELECT (SELECT DISTINCT o.a FROM t1 AS i) FROM t1 AS o ORDER BY rowid;
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} {a A a A}
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do_test 3.0 {
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db eval {
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CREATE TABLE t3(a INTEGER, b INTEGER, c, UNIQUE(a,b));
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INSERT INTO t3 VALUES
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(null, null, 1),
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(null, null, 2),
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(null, 3, 4),
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(null, 3, 5),
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(6, null, 7),
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(6, null, 8);
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SELECT DISTINCT a, b FROM t3 ORDER BY +a, +b;
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}
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} {{} {} {} 3 6 {}}
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do_test 3.1 {
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regexp {OpenEphemeral} [db eval {
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EXPLAIN SELECT DISTINCT a, b FROM t3 ORDER BY +a, +b;
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}]
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} {0}
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finish_test
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