minmax.test

# 2001 September 15
#
# 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.
#
# $Id: minmax.test,v 1.21 2008/07/08 18:05:26 drh Exp $

set testdir [file dirname $argv0]
source $testdir/tester.tcl
set ::testprefix minmax

do_test minmax-1.0 {
  execsql {
    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 minmax-1.1 {
  set sqlite_search_count 0
  execsql {SELECT min(x) FROM t1}
} {1}
do_test minmax-1.2 {
  set sqlite_search_count
} {19}
do_test minmax-1.3 {
  set sqlite_search_count 0
  execsql {SELECT max(x) FROM t1}
} {20}
do_test minmax-1.4 {
  set sqlite_search_count
} {19}
do_test minmax-1.5 {
  execsql {CREATE INDEX t1i1 ON t1(x)}
  set sqlite_search_count 0
  execsql {SELECT min(x) FROM t1}
} {1}
do_test minmax-1.6 {
  set sqlite_search_count
} {1}
do_test minmax-1.7 {
  set sqlite_search_count 0
  execsql {SELECT max(x) FROM t1}
} {20}
do_test minmax-1.8 {
  set sqlite_search_count
} {0}
do_test minmax-1.9 {
  set sqlite_search_count 0
  execsql {SELECT max(y) FROM t1}
} {5}
do_test minmax-1.10 {
  set sqlite_search_count
} {19}

do_test minmax-1.21 {
  execsql {SELECT min(x) FROM t1 WHERE x=5}
} {5}
do_test minmax-1.22 {
  execsql {SELECT min(x) FROM t1 WHERE x>=5}
} {5}
do_test minmax-1.23 {
  execsql {SELECT min(x) FROM t1 WHERE x>=4.5}
} {5}
do_test minmax-1.24 {
  execsql {SELECT min(x) FROM t1 WHERE x<4.5}
} {1}

do_test minmax-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 minmax-2.1 {
  set sqlite_search_count
} {0}
do_test minmax-2.2 {
  set sqlite_search_count 0
  execsql {SELECT max(a) FROM t2}
} {20}
do_test minmax-2.3 {
  set sqlite_search_count
} {0}

do_test minmax-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 minmax-3.1 {
  set sqlite_search_count
} {0}
do_test minmax-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 minmax-3.3 {
  set sqlite_search_count
} {0}

ifcapable {compound && subquery} {
  do_test minmax-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 minmax-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 minmax-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 minmax-5.1 {
  execsql {
    CREATE TABLE t3(x INTEGER UNIQUE NOT NULL);
    SELECT coalesce(min(x),999) FROM t3;
  }
} {999}
do_test minmax-5.2 {
  execsql {
    SELECT coalesce(min(rowid),999) FROM t3;
  }
} {999}
do_test minmax-5.3 {
  execsql {
    SELECT coalesce(max(x),999) FROM t3;
  }
} {999}
do_test minmax-5.4 {
  execsql {
    SELECT coalesce(max(rowid),999) FROM t3;
  }
} {999}
do_test minmax-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 minmax-6.1 {
  execsql {
    SELECT min(a) FROM t2 LIMIT 1
  }
} {1}
do_test minmax-6.2 {
  execsql {
    SELECT max(a) FROM t2 LIMIT 3
  }
} {22}
do_test minmax-6.3 {
  execsql {
    SELECT min(a) FROM t2 LIMIT 0,100
  }
} {1}
do_test minmax-6.4 {
  execsql {
    SELECT max(a) FROM t2 LIMIT 1,100
  }
} {}
do_test minmax-6.5 {
  execsql {
    SELECT min(x) FROM t3 LIMIT 1
  }
} {{}}
do_test minmax-6.6 {
  execsql {
    SELECT max(x) FROM t3 LIMIT 0
  }
} {}
do_test minmax-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 minmax-7.1 {
  execsql {
    SELECT max(x) FROM t1;
  }
} 20
ifcapable subquery {
  do_test minmax-7.2 {
    execsql {
      SELECT * FROM (SELECT max(x) FROM t1);
    }
  } 20
}
do_test minmax-7.3 {
  execsql {
    SELECT min(x) FROM t1;
  }
} 1
ifcapable subquery {
  do_test minmax-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 minmax-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 minmax-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 minmax-9.0 {
    execsql {
      SELECT max(rowid) AS yy FROM t4 UNION SELECT max(rowid) FROM t5
    }
  } {3}
  do_test minmax-9.1 {
    execsql {
      SELECT max(yy) FROM (
        SELECT max(rowid) AS yy FROM t4 UNION SELECT max(rowid) FROM t5
      )
    }
  } {3}
  do_test minmax-9.2 {
    execsql {
      SELECT max(yy) FROM (
        SELECT max(rowid) AS yy 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 minmax-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 minmax-10.2 {
  execsql {
    SELECT max(x) FROM t6;
  }
} {2}
do_test minmax-10.3 {
  execsql {
    CREATE INDEX i6 ON t6(x);
    SELECT coalesce(min(x),-1) FROM t6;
  }
} {1}
do_test minmax-10.4 {
  execsql {
    SELECT max(x) FROM t6;
  }
} {2}
do_test minmax-10.5 {
  execsql {
    DELETE FROM t6 WHERE x NOT NULL;
    SELECT count(*) FROM t6;
  }
} 1
do_test minmax-10.6 {
  execsql {
    SELECT count(x) FROM t6;
  }
} 0
ifcapable subquery {
  do_test minmax-10.7 {
    execsql {
      SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
    }
  } {{} {}}
}
do_test minmax-10.8 {
  execsql {
    SELECT min(x), max(x) FROM t6;
  }
} {{} {}}
do_test minmax-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 minmax-10.10 {
  execsql {
    SELECT count(x) FROM t6;
  }
} 0
ifcapable subquery {
  do_test minmax-10.11 {
    execsql {
      SELECT (SELECT min(x) FROM t6), (SELECT max(x) FROM t6);
    }
  } {{} {}}
}
do_test minmax-10.12 {
  execsql {
    SELECT min(x), max(x) FROM t6;
  }
} {{} {}}


do_test minmax-11.1 {
  execsql {
    CREATE INDEX t1i2 ON t1(y,x);
    SELECT min(x) FROM t1 WHERE y=5;
  }
} {16}
do_test minmax-11.2 {
  execsql {
    SELECT max(x) FROM t1 WHERE y=5;
  }
} {20}
do_test minmax-11.3 {
  execsql {
    SELECT min(x) FROM t1 WHERE y=6;
  }
} {{}}
do_test minmax-11.4 {
  execsql {
    SELECT max(x) FROM t1 WHERE y=6;
  }
} {{}}
do_test minmax-11.5 {
  execsql {
    SELECT min(x) FROM t1 WHERE y=1;
  }
} {1}
do_test minmax-11.6 {
  execsql {
    SELECT max(x) FROM t1 WHERE y=1;
  }
} {1}
do_test minmax-11.7 {
  execsql {
    SELECT min(x) FROM t1 WHERE y=0;
  }
} {{}}
do_test minmax-11.8 {
  execsql {
    SELECT max(x) FROM t1 WHERE y=0;
  }
} {{}}
do_test minmax-11.9 {
  execsql {
    SELECT min(x) FROM t1 WHERE y=5 AND x>=17.5;
  }
} {18}
do_test minmax-11.10 {
  execsql {
    SELECT max(x) FROM t1 WHERE y=5 AND x>=17.5;
  }
} {20}

do_test minmax-12.1 {
  execsql {
    CREATE TABLE t7(a,b,c);
    INSERT INTO t7 SELECT y, x, x*y FROM t1;
    INSERT INTO t7 SELECT y, x, x*y+1000 FROM t1;
    CREATE INDEX t7i1 ON t7(a,b,c);
    SELECT min(a) FROM t7;
  }
} {1}
do_test minmax-12.2 {
  execsql {
    SELECT max(a) FROM t7;
  }
} {5}
do_test minmax-12.3 {
  execsql {
    SELECT max(a) FROM t7 WHERE a=5;
  }
} {5}
do_test minmax-12.4 {
  execsql {
    SELECT min(b) FROM t7 WHERE a=5;
  }
} {16}
do_test minmax-12.5 {
  execsql {
    SELECT max(b) FROM t7 WHERE a=5;
  }
} {20}
do_test minmax-12.6 {
  execsql {
    SELECT min(b) FROM t7 WHERE a=4;
  }
} {8}
do_test minmax-12.7 {
  execsql {
    SELECT max(b) FROM t7 WHERE a=4;
  }
} {15}
do_test minmax-12.8 {
  execsql {
    SELECT min(c) FROM t7 WHERE a=4 AND b=10;
  }
} {40}
do_test minmax-12.9 {
  execsql {
    SELECT max(c) FROM t7 WHERE a=4 AND b=10;
  }
} {1040}
do_test minmax-12.10 {
  execsql {
    SELECT min(rowid) FROM t7;
  }
} {1}
do_test minmax-12.11 {
  execsql {
    SELECT max(rowid) FROM t7;
  }
} {40}
do_test minmax-12.12 {
  execsql {
    SELECT min(rowid) FROM t7 WHERE a=3;
  }
} {4}
do_test minmax-12.13 {
  execsql {
    SELECT max(rowid) FROM t7 WHERE a=3;
  }
} {27}
do_test minmax-12.14 {
  execsql {
    SELECT min(rowid) FROM t7 WHERE a=3 AND b=5;
  }
} {5}
do_test minmax-12.15 {
  execsql {
    SELECT max(rowid) FROM t7 WHERE a=3 AND b=5;
  }
} {25}
do_test minmax-12.16 {
  execsql {
    SELECT min(rowid) FROM t7 WHERE a=3 AND b=5 AND c=1015;
  }
} {25}
do_test minmax-12.17 {
  execsql {
    SELECT max(rowid) FROM t7 WHERE a=3 AND b=5 AND c=15;
  }
} {5}

#-------------------------------------------------------------------------
reset_db

proc do_test_13 {op name sql1 sql2 res} {
  set ::sqlite_search_count 0
  uplevel [list do_execsql_test $name.1 $sql1 $res]
  set a $::sqlite_search_count

  set ::sqlite_search_count 0
  uplevel [list do_execsql_test $name.2 $sql2 $res]
  set b $::sqlite_search_count

  uplevel [list do_test $name.3 [list expr "$a $op $b"] 1]
}

# Run a test named $name. Check that SQL statements $sql1 and $sql2 both
# return the same result, but that $sql2 increments the $sqlite_search_count
# variable more often (indicating that it is visiting more rows to determine
# the result).
#
proc do_test_13_opt {name sql1 sql2 res} {
  uplevel [list do_test_13 < $name $sql1 $sql2 $res]
}

# Like [do_test_13_noopt], except this time check that the $sqlite_search_count
# variable is incremented the same number of times by both SQL statements.
#
proc do_test_13_noopt {name sql1 sql2 res} {
  uplevel [list do_test_13 == $name $sql1 $sql2 $res]
}

do_execsql_test 13.1 {
  CREATE TABLE t1(a, b, c);
  INSERT INTO t1 VALUES('a', 1, 1);
  INSERT INTO t1 VALUES('b', 6, 6);
  INSERT INTO t1 VALUES('c', 5, 5);
  INSERT INTO t1 VALUES('a', 4, 4);
  INSERT INTO t1 VALUES('a', 5, 5);
  INSERT INTO t1 VALUES('c', 6, 6);
  INSERT INTO t1 VALUES('b', 4, 4);
  INSERT INTO t1 VALUES('c', 7, 7);
  INSERT INTO t1 VALUES('b', 2, 2);
  INSERT INTO t1 VALUES('b', 3, 3);
  INSERT INTO t1 VALUES('a', 3, 3);
  INSERT INTO t1 VALUES('b', 5, 5);
  INSERT INTO t1 VALUES('c', 4, 4);
  INSERT INTO t1 VALUES('c', 3, 3);
  INSERT INTO t1 VALUES('a', 2, 2);
  SELECT * FROM t1 ORDER BY a, b, c;
} {a 1 1 a 2 2 a 3 3 a 4 4 a 5 5
   b 2 2 b 3 3 b 4 4 b 5 5 b 6 6
   c 3 3 c 4 4 c 5 5 c 6 6 c 7 7
}
do_execsql_test 13.2 { CREATE INDEX i1 ON t1(a, b, c) }

do_test_13_opt 13.3 {
  SELECT min(b) FROM t1 WHERE a='b'
} {
  SELECT min(c) FROM t1 WHERE a='b'
} {2}

do_test_13_opt 13.4 {
  SELECT a, min(b) FROM t1 WHERE a='b'
} {
  SELECT a, min(c) FROM t1 WHERE a='b'
} {b 2}

do_test_13_opt 13.4 {
  SELECT a||c, max(b)+4 FROM t1 WHERE a='c'
} {
  SELECT a||c, max(c)+4 FROM t1 WHERE a='c'
} {c7 11}

do_test_13_noopt 13.5 {
  SELECT a||c, max(b+1) FROM t1 WHERE a='c'
} {
  SELECT a||c, max(c+1) FROM t1 WHERE a='c'
} {c7 8}

do_test_13_noopt 13.6 {
  SELECT count(b) FROM t1 WHERE a='c'
} {
  SELECT count(c) FROM t1 WHERE a='c'
} {5}

do_test_13_noopt 13.7 {
  SELECT min(b), count(b) FROM t1 WHERE a='a';
} {
  SELECT min(c), count(c) FROM t1 WHERE a='a';
} {1 5}

# 2016-07-26.  https://www.sqlite.org/src/info/a0bac8b3c3d1bb75
# Incorrect result on a min() query after a CREATE INDEX.
#
do_execsql_test 14.1 {
  CREATE TABLE t14(a INTEGER, b INTEGER);
  INSERT INTO t14(a,b) VALUES(100,2),(200,2),(300,2),(400,1),(500,2);
  SELECT min(a) FROM t14 WHERE b='2' AND a>'50';
} {100}
do_execsql_test 14.2 {
  CREATE INDEX t14ba ON t14(b,a);
  SELECT min(a) FROM t14 WHERE b='2' AND a>'50';
} {100}

# 2021-08-21.  https://sqlite.org/forum/forumpost/cfcb4b461d
# 
reset_db
do_execsql_test 15.1 {
  CREATE TABLE t1(a);
  CREATE TABLE t2(b);
  CREATE TABLE t3(c);
  INSERT INTO t1 VALUES(0);
  INSERT INTO t2 VALUES(5);
  SELECT MIN((SELECT b FROM t2 UNION SELECT x FROM (SELECT x FROM (SELECT 1 AS x WHERE t1.a=1) UNION ALL SELECT c FROM t3))) FROM t1;
} {5}

finish_test