Artifact 5b89f055df7ed03334e96eec0efb804afb7de638:

• File test/minmax3.test — part of check-in [c449e04f] at 2008-01-05 17:39:30 on branch trunk — First pass at optimizing max()/min() as described in #2853. Some refinements to come. (CVS 4687) (user: danielk1977 size: 4307)

# 2008 January 5
#
# 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.
#
#***********************************************************************
# $Id: minmax3.test,v 1.1 2008/01/05 17:39:30 danielk1977 Exp $

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

# Do an SQL statement.  Append the search count to the end of the result.
#
proc count sql {
  set ::sqlite_search_count 0
  return [concat [execsql $sql] $::sqlite_search_count]
}

# This procedure sets the value of the file-format in file 'test.db'
# to $newval. Also, the schema cookie is incremented.
# 
proc set_file_format {newval} {
  set bt [btree_open test.db 10 0]
  btree_begin_transaction $bt
  set meta [btree_get_meta $bt]
  lset meta 2 $newval                    ;# File format
  lset meta 1 [expr [lindex $meta 1]+1]  ;# Schema cookie
  eval "btree_update_meta $bt $meta"
  btree_commit $bt
  btree_close $bt
}

# Create the file as file-format 4 (DESC index support). This is 
# required to exercise a few cases in where.c.
#
execsql { select * from sqlite_master }
set_file_format 4

do_test minmax3-1.0 {
  execsql {
    BEGIN;
    CREATE TABLE t1(x, y, z);
    INSERT INTO t1 VALUES('1', 'I',   'one');
    INSERT INTO t1 VALUES('2', 'IV',  'four');
    INSERT INTO t1 VALUES('2', NULL,  'three');
    INSERT INTO t1 VALUES('2', 'II',  'two');
    INSERT INTO t1 VALUES('2', 'V',   'five');
    INSERT INTO t1 VALUES('3', 'VI',  'six');
    COMMIT;
  }
} {}
do_test minmax3-1.1.1 {
  # Linear scan.
  count { SELECT max(y) FROM t1 WHERE x = '2'; }
} {V 5}
do_test minmax3-1.1.2 {
  # Index optimizes the WHERE x='2' constraint.
  execsql { CREATE INDEX i1 ON t1(x) }
  count   { SELECT max(y) FROM t1 WHERE x = '2'; }
} {V 9}
do_test minmax3-1.1.3 {
  # Index optimizes the WHERE x='2' constraint and the MAX(y).
  execsql { CREATE INDEX i2 ON t1(x,y) }
  count   { SELECT max(y) FROM t1 WHERE x = '2'; }
} {V 1}
do_test minmax3-1.1.4 {
  # Index optimizes the WHERE x='2' constraint and the MAX(y).
  execsql { DROP INDEX i2 ; CREATE INDEX i2 ON t1(x, y DESC) }
  count   { SELECT max(y) FROM t1 WHERE x = '2'; }
} {V 1}
do_test minmax3-1.1.5 {
  count   { SELECT max(y) FROM t1 WHERE x = '2' AND y != 'V'; }
} {IV 2}
do_test minmax3-1.1.6 {
  count   { SELECT max(y) FROM t1 WHERE x = '2' AND y < 'V'; }
} {IV 1}
do_test minmax3-1.1.6 {
  count   { SELECT max(y) FROM t1 WHERE x = '2' AND z != 'five'; }
} {IV 4}

do_test minmax3-1.2.1 {
  # Linear scan of t1.
  execsql { DROP INDEX i1 ; DROP INDEX i2 }
  count { SELECT min(y) FROM t1 WHERE x = '2'; }
} {II 5}
do_test minmax3-1.2.2 {
  # Index i1 optimizes the WHERE x='2' constraint.
  execsql { CREATE INDEX i1 ON t1(x) }
  count   { SELECT min(y) FROM t1 WHERE x = '2'; }
} {II 9}
do_test minmax3-1.2.3 {
  # Index i2 optimizes the WHERE x='2' constraint and the min(y).
  execsql { CREATE INDEX i2 ON t1(x,y) }
  count   { SELECT min(y) FROM t1 WHERE x = '2'; }
} {II 1}
do_test minmax3-1.2.4 {
  # Index optimizes the WHERE x='2' constraint and the MAX(y).
  execsql { DROP INDEX i2 ; CREATE INDEX i2 ON t1(x, y DESC) }
  count   { SELECT min(y) FROM t1 WHERE x = '2'; }
} {II 1}

do_test minmax3-1.3.1 {
  # Linear scan
  execsql { DROP INDEX i1 ; DROP INDEX i2 }
  count   { SELECT min(y) FROM t1; }
} {I 5}
do_test minmax3-1.3.2 {
  # Index i1 optimizes the min(y)
  execsql { CREATE INDEX i1 ON t1(y) }
  count   { SELECT min(y) FROM t1; }
} {I 1}
do_test minmax3-1.3.3 {
  # Index i1 optimizes the min(y)
  execsql { DROP INDEX i1 ; CREATE INDEX i1 ON t1(y DESC) }
  count   { SELECT min(y) FROM t1; }
} {I 1}

do_test minmax3-1.4.1 {
  # Linear scan
  execsql { DROP INDEX i1 }
  count   { SELECT max(y) FROM t1; }
} {VI 5}
do_test minmax3-1.4.2 {
  # Index i1 optimizes the max(y)
  execsql { CREATE INDEX i1 ON t1(y) }
  count   { SELECT max(y) FROM t1; }
} {VI 0}
do_test minmax3-1.4.3 {
  # Index i1 optimizes the max(y)
  execsql { DROP INDEX i1 ; CREATE INDEX i1 ON t1(y DESC) }
  execsql   { SELECT y from t1}
  count   { SELECT max(y) FROM t1; }
} {VI 0}
do_test minmax3-1.4.4 {
  execsql { DROP INDEX i1 }
} {}


finish_test