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+# 2007 July 17
+#
+# 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 file is testing SELECT statements that contain
+# aggregate min() and max() functions and which are handled as
+# as a special case. This file makes sure that the min/max
+# optimization works right in the presence of descending
+# indices. Ticket #2514.
+#
+# $Id: minmax2.test,v 1.2 2008/01/05 17:39:30 danielk1977 Exp $
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+
+do_test minmax2-1.0 {
+ execsql {
+ PRAGMA legacy_file_format=0;
+ BEGIN;
+ CREATE TABLE t1(x, y);
+ INSERT INTO t1 VALUES(1,1);
+ INSERT INTO t1 VALUES(2,2);
+ INSERT INTO t1 VALUES(3,2);
+ INSERT INTO t1 VALUES(4,3);
+ INSERT INTO t1 VALUES(5,3);
+ INSERT INTO t1 VALUES(6,3);
+ INSERT INTO t1 VALUES(7,3);
+ INSERT INTO t1 VALUES(8,4);
+ INSERT INTO t1 VALUES(9,4);
+ INSERT INTO t1 VALUES(10,4);
+ INSERT INTO t1 VALUES(11,4);
+ INSERT INTO t1 VALUES(12,4);
+ INSERT INTO t1 VALUES(13,4);
+ INSERT INTO t1 VALUES(14,4);
+ INSERT INTO t1 VALUES(15,4);
+ INSERT INTO t1 VALUES(16,5);
+ INSERT INTO t1 VALUES(17,5);
+ INSERT INTO t1 VALUES(18,5);
+ INSERT INTO t1 VALUES(19,5);
+ INSERT INTO t1 VALUES(20,5);
+ COMMIT;
+ SELECT DISTINCT y FROM t1 ORDER BY y;
+ }
+} {1 2 3 4 5}
+
+do_test minmax2-1.1 {
+ set sqlite_search_count 0
+ execsql {SELECT min(x) FROM t1}
+} {1}
+do_test minmax2-1.2 {
+ set sqlite_search_count
+} {19}
+do_test minmax2-1.3 {
+ set sqlite_search_count 0
+ execsql {SELECT max(x) FROM t1}
+} {20}
+do_test minmax2-1.4 {
+ set sqlite_search_count
+} {19}
+do_test minmax2-1.5 {
+ execsql {CREATE INDEX t1i1 ON t1(x DESC)}
+ set sqlite_search_count 0
+ execsql {SELECT min(x) FROM t1}
+} {1}
+do_test minmax2-1.6 {
+ set sqlite_search_count
+} {1}
+do_test minmax2-1.7 {
+ set sqlite_search_count 0
+ execsql {SELECT max(x) FROM t1}
+} {20}
+do_test minmax2-1.8 {
+ set sqlite_search_count
+} {0}
+do_test minmax2-1.9 {
+ set sqlite_search_count 0
+ execsql {SELECT max(y) FROM t1}
+} {5}
+do_test minmax2-1.10 {
+ set sqlite_search_count
+} {19}
+
+do_test minmax2-2.0 {
+ execsql {
+ CREATE TABLE t2(a INTEGER PRIMARY KEY, b);
+ INSERT INTO t2 SELECT * FROM t1;
+ }
+ set sqlite_search_count 0
+ execsql {SELECT min(a) FROM t2}
+} {1}
+do_test minmax2-2.1 {
+ set sqlite_search_count
+} {0}
+do_test minmax2-2.2 {
+ set sqlite_search_count 0
+ execsql {SELECT max(a) FROM t2}
+} {20}
+do_test minmax2-2.3 {
+ set sqlite_search_count
+} {0}
+
+do_test minmax2-3.0 {
+ ifcapable subquery {
+ execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
+ } else {
+ db function max_a_t2 {execsql {SELECT max(a) FROM t2}}
+ execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)}
+ }
+ set sqlite_search_count 0
+ execsql {SELECT max(a) FROM t2}
+} {21}
+do_test minmax2-3.1 {
+ set sqlite_search_count
+} {0}
+do_test minmax2-3.2 {
+ ifcapable subquery {
+ execsql {INSERT INTO t2 VALUES((SELECT max(a) FROM t2)+1,999)}
+ } else {
+ db function max_a_t2 {execsql {SELECT max(a) FROM t2}}
+ execsql {INSERT INTO t2 VALUES(max_a_t2()+1,999)}
+ }
+ set sqlite_search_count 0
+ ifcapable subquery {
+ execsql { SELECT b FROM t2 WHERE a=(SELECT max(a) FROM t2) }
+ } else {
+ execsql { SELECT b FROM t2 WHERE a=max_a_t2() }
+ }
+} {999}
+do_test minmax2-3.3 {
+ set sqlite_search_count
+} {0}
+
+ifcapable {compound && subquery} {
+ do_test minmax2-4.1 {
+ execsql {
+ SELECT coalesce(min(x+0),-1), coalesce(max(x+0),-1) FROM
+ (SELECT * FROM t1 UNION SELECT NULL as 'x', NULL as 'y')
+ }
+ } {1 20}
+ do_test minmax2-4.2 {
+ execsql {
+ SELECT y, coalesce(sum(x),0) FROM
+ (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1)
+ GROUP BY y ORDER BY y;
+ }
+ } {1 1 2 5 3 22 4 92 5 90 6 0}
+ do_test minmax2-4.3 {
+ execsql {
+ SELECT y, count(x), count(*) FROM
+ (SELECT null AS x, y+1 AS y FROM t1 UNION SELECT * FROM t1)
+ GROUP BY y ORDER BY y;
+ }
+ } {1 1 1 2 2 3 3 4 5 4 8 9 5 5 6 6 0 1}
+} ;# ifcapable compound
+
+# Make sure the min(x) and max(x) optimizations work on empty tables
+# including empty tables with indices. Ticket #296.
+#
+do_test minmax2-5.1 {
+ execsql {
+ CREATE TABLE t3(x INTEGER UNIQUE NOT NULL);
+ SELECT coalesce(min(x),999) FROM t3;
+ }
+} {999}
+do_test minmax2-5.2 {
+ execsql {
+ SELECT coalesce(min(rowid),999) FROM t3;
+ }
+} {999}
+do_test minmax2-5.3 {
+ execsql {
+ SELECT coalesce(max(x),999) FROM t3;
+ }
+} {999}
+do_test minmax2-5.4 {
+ execsql {
+ SELECT coalesce(max(rowid),999) FROM t3;
+ }
+} {999}
+do_test minmax2-5.5 {
+ execsql {
+ SELECT coalesce(max(rowid),999) FROM t3 WHERE rowid<25;
+ }
+} {999}
+
+# Make sure the min(x) and max(x) optimizations work when there
+# is a LIMIT clause. Ticket #396.
+#
+do_test minmax2-6.1 {
+ execsql {
+ SELECT min(a) FROM t2 LIMIT 1
+ }
+} {1}
+do_test minmax2-6.2 {
+ execsql {
+ SELECT max(a) FROM t2 LIMIT 3
+ }
+} {22}
+do_test minmax2-6.3 {
+ execsql {
+ SELECT min(a) FROM t2 LIMIT 0,100
+ }
+} {1}
+do_test minmax2-6.4 {
+ execsql {
+ SELECT max(a) FROM t2 LIMIT 1,100
+ }
+} {}
+do_test minmax2-6.5 {
+ execsql {
+ SELECT min(x) FROM t3 LIMIT 1
+ }
+} {{}}
+do_test minmax2-6.6 {
+ execsql {
+ SELECT max(x) FROM t3 LIMIT 0
+ }
+} {}
+do_test minmax2-6.7 {
+ execsql {
+ SELECT max(a) FROM t2 LIMIT 0
+ }
+} {}
+
+# Make sure the max(x) and min(x) optimizations work for nested
+# queries. Ticket #587.
+#
+do_test minmax2-7.1 {
+ execsql {
+ SELECT max(x) FROM t1;
+ }
+} 20
+ifcapable subquery {
+ do_test minmax2-7.2 {
+ execsql {
+ SELECT * FROM (SELECT max(x) FROM t1);
+ }
+ } 20
+}
+do_test minmax2-7.3 {
+ execsql {
+ SELECT min(x) FROM t1;
+ }
+} 1
+ifcapable subquery {
+ do_test minmax2-7.4 {
+ execsql {
+ SELECT * FROM (SELECT min(x) FROM t1);
+ }
+ } 1
+}
+
+# Make sure min(x) and max(x) work correctly when the datatype is
+# TEXT instead of NUMERIC. Ticket #623.
+#
+do_test minmax2-8.1 {
+ execsql {
+ CREATE TABLE t4(a TEXT);
+ INSERT INTO t4 VALUES('1234');
+ INSERT INTO t4 VALUES('234');
+ INSERT INTO t4 VALUES('34');
+ SELECT min(a), max(a) FROM t4;
+ }
+} {1234 34}
+do_test minmax2-8.2 {
+ execsql {
+ CREATE TABLE t5(a INTEGER);
+ INSERT INTO t5 VALUES('1234');
+ INSERT INTO t5 VALUES('234');
+ INSERT INTO t5 VALUES('34');
+ SELECT min(a), max(a) FROM t5;
+ }
+} {34 1234}
+
+# Ticket #658: Test the min()/max() optimization when the FROM clause
+# is a subquery.
+#
+ifcapable {compound && subquery} {
+ do_test minmax2-9.1 {
+ execsql {
+ SELECT max(rowid) FROM (
+ SELECT max(rowid) FROM t4 UNION SELECT max(rowid) FROM t5
+ )
+ }
+ } {1}
+ do_test minmax2-9.2 {
+ execsql {
+ SELECT max(rowid) FROM (
+ SELECT max(rowid) FROM t4 EXCEPT SELECT max(rowid) FROM t5
+ )
+ }
+ } {{}}
+} ;# ifcapable compound&&subquery
+
+# If there is a NULL in an aggregate max() or min(), ignore it. An
+# aggregate min() or max() will only return NULL if all values are NULL.
+#
+do_test minmax2-10.1 {
+ execsql {
+ CREATE TABLE t6(x);
+ INSERT INTO t6 VALUES(1);
+ INSERT INTO t6 VALUES(2);
+ INSERT INTO t6 VALUES(NULL);
+ SELECT coalesce(min(x),-1) FROM t6;
+ }
+} {1}
+do_test minmax2-10.2 {
+ execsql {
+ SELECT max(x) FROM t6;
+ }
+} {2}
+do_test minmax2-10.3 {
+ execsql {
+ CREATE INDEX i6 ON t6(x DESC);
+ SELECT coalesce(min(x),-1) FROM t6;
+ }
+} {1}
+do_test minmax2-10.4 {
+ execsql {
+ SELECT max(x) FROM t6;
+ }
+} {2}
+do_test minmax2-10.5 {
+ execsql {
+ DELETE FROM t6 WHERE x NOT NULL;
+ SELECT count(*) FROM t6;
+ }
+} 1
+do_test minmax2-10.6 {
+ execsql {
+ SELECT count(x) FROM t6;
+ }
+} 0
+ifcapable subquery {
+ do_test minmax2-10.7 {
+ execsql {
+ SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
+ }
+ } {{} {}}
+}
+do_test minmax2-10.8 {
+ execsql {
+ SELECT min(x), max(x) FROM t6;
+ }
+} {{} {}}
+do_test minmax2-10.9 {
+ execsql {
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ INSERT INTO t6 SELECT * FROM t6;
+ SELECT count(*) FROM t6;
+ }
+} 1024
+do_test minmax2-10.10 {
+ execsql {
+ SELECT count(x) FROM t6;
+ }
+} 0
+ifcapable subquery {
+ do_test minmax2-10.11 {
+ execsql {
+ SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
+ }
+ } {{} {}}
+}
+do_test minmax2-10.12 {
+ execsql {
+ SELECT min(x), max(x) FROM t6;
+ }
+} {{} {}}
+
+
+finish_test
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