# 2005 September 11
#
# 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 on aggregate functions.
#
# $Id: distinctagg.test,v 1.3 2009/02/09 13:19:28 drh Exp $


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

do_test distinctagg-1.1 {
  execsql {
    CREATE TABLE t1(a,b,c);
    INSERT INTO t1 VALUES(1,2,3);
    INSERT INTO t1 VALUES(1,3,4);
    INSERT INTO t1 VALUES(1,3,5);
    SELECT count(distinct a),
           count(distinct b),
           count(distinct c),
           count(all a) FROM t1;
  }
} {1 2 3 3}
do_test distinctagg-1.2 {
  execsql {
    SELECT b, count(distinct c) FROM t1 GROUP BY b
  }
} {2 1 3 2}
do_test distinctagg-1.3 {
  execsql {
    INSERT INTO t1 SELECT a+1, b+3, c+5 FROM t1;
    INSERT INTO t1 SELECT a+2, b+6, c+10 FROM t1;
    INSERT INTO t1 SELECT a+4, b+12, c+20 FROM t1;
    SELECT count(*), count(distinct a), count(distinct b) FROM t1
  }
} {24 8 16}
do_test distinctagg-1.4 {
  execsql {
    SELECT a, count(distinct c) FROM t1 GROUP BY a ORDER BY a
  }
} {1 3 2 3 3 3 4 3 5 3 6 3 7 3 8 3}

do_test distinctagg-2.1 {
  catchsql {
    SELECT count(distinct) FROM t1;
  }
} {1 {DISTINCT aggregates must have exactly one argument}}
do_test distinctagg-2.2 {
  catchsql {
    SELECT string_agg(distinct a,b) FROM t1;
  }
} {1 {DISTINCT aggregates must have exactly one argument}}

#--------------------------------------------------------------------------
reset_db
do_execsql_test 3.0 {
  CREATE TABLE t1(a, b, c);
  CREATE TABLE t2(d, e, f);

  INSERT INTO t1 VALUES (1, 1, 1);
  INSERT INTO t1 VALUES (2, 2, 2);
  INSERT INTO t1 VALUES (3, 3, 3);
  INSERT INTO t1 VALUES (4, 1, 4);
  INSERT INTO t1 VALUES (5, 2, 1);
  INSERT INTO t1 VALUES (5, 3, 2);
  INSERT INTO t1 VALUES (4, 1, 3);
  INSERT INTO t1 VALUES (3, 2, 4);
  INSERT INTO t1 VALUES (2, 3, 1);
  INSERT INTO t1 VALUES (1, 1, 2);

  INSERT INTO t2 VALUES('a', 'a', 'a');
  INSERT INTO t2 VALUES('b', 'b', 'b');
  INSERT INTO t2 VALUES('c', 'c', 'c');

  CREATE INDEX t1a ON t1(a);
  CREATE INDEX t1bc ON t1(b, c);
}

foreach {tn use_eph sql res} {
  1  0  "SELECT count(DISTINCT a) FROM t1"                5
  2  0  "SELECT count(DISTINCT b) FROM t1"                3
  3  1  "SELECT count(DISTINCT c) FROM t1"                4
  4  0  "SELECT count(DISTINCT c) FROM t1 WHERE b=3"      3
  5  0  "SELECT count(DISTINCT rowid) FROM t1"           10
  6  0  "SELECT count(DISTINCT a) FROM t1, t2"            5
  7  0  "SELECT count(DISTINCT a) FROM t2, t1"            5
  8  1  "SELECT count(DISTINCT a+b) FROM t1, t2, t2, t2"  6
  9  0  "SELECT count(DISTINCT c) FROM t1 WHERE c=2"      1
 10  0  "SELECT count(DISTINCT t1.rowid) FROM t1, t2"    10
} {
  do_test 3.$tn.1 {
    set prg [db eval "EXPLAIN $sql"]
    set idx [lsearch $prg OpenEphemeral]
    expr {$idx>=0}
  } $use_eph

  do_execsql_test 3.$tn.2 $sql $res
}

do_execsql_test 3.10 {
  SELECT a, count(DISTINCT b) FROM t1 GROUP BY a;
} {
  1 1  2 2  3 2  4 1  5 2
}

#--------------------------------------------------------------------------
reset_db
do_execsql_test 3.0 {
  CREATE TABLE t1(a, b, c);
  CREATE INDEX t1a ON t1(a);
  CREATE INDEX t1bc ON t1(b, c);

  INSERT INTO t1 VALUES(1, 'A', 1);
  INSERT INTO t1 VALUES(1, 'A', 1);
  INSERT INTO t1 VALUES(2, 'A', 2);
  INSERT INTO t1 VALUES(2, 'A', 2);
  INSERT INTO t1 VALUES(1, 'B', 1);
  INSERT INTO t1 VALUES(2, 'B', 2);
  INSERT INTO t1 VALUES(3, 'B', 3);
  INSERT INTO t1 VALUES(NULL, 'B', NULL);
  INSERT INTO t1 VALUES(NULL, 'C', NULL);
  INSERT INTO t1 VALUES('d', 'D', 'd');

  CREATE TABLE t2(d, e, f);
  CREATE INDEX t2def ON t2(d, e, f);

  INSERT INTO t2 VALUES(1, 1, 'a');
  INSERT INTO t2 VALUES(1, 1, 'a');
  INSERT INTO t2 VALUES(1, 2, 'a');
  INSERT INTO t2 VALUES(1, 2, 'a');
  INSERT INTO t2 VALUES(1, 2, 'b');
  INSERT INTO t2 VALUES(1, 3, 'b');
  INSERT INTO t2 VALUES(1, 3, 'a');
  INSERT INTO t2 VALUES(1, 3, 'b');
  INSERT INTO t2 VALUES(2, 3, 'x');
  INSERT INTO t2 VALUES(2, 3, 'y');
  INSERT INTO t2 VALUES(2, 3, 'z');

  CREATE TABLE t3(x, y, z);
  INSERT INTO t3 VALUES(1,1,1);
  INSERT INTO t3 VALUES(2,2,2);

  CREATE TABLE t4(a);
  CREATE INDEX t4a ON t4(a);
  INSERT INTO t4 VALUES(1), (2), (2), (3), (1);
}

foreach {tn use_eph sql res} {
  1 0  "SELECT count(DISTINCT c) FROM t1 GROUP BY b"   {2 3 0 1}
  2 1  "SELECT count(DISTINCT a) FROM t1 GROUP BY b"   {2 3 0 1}
  3 1  "SELECT count(DISTINCT a) FROM t1 GROUP BY b+c" {0 1 1 1 1}

  4 0  "SELECT count(DISTINCT f) FROM t2 GROUP BY d, e" {1 2 2 3}
  5 1  "SELECT count(DISTINCT f) FROM t2 GROUP BY d" {2 3}
  6 0  "SELECT count(DISTINCT f) FROM t2 WHERE d IS 1 GROUP BY e" {1 2 2}

  7 0  "SELECT count(DISTINCT a) FROM t1" {4}
  8 0  "SELECT count(DISTINCT a) FROM t4" {3}
} {
  do_test 4.$tn.1 {
    set prg [db eval "EXPLAIN $sql"]
    set idx [lsearch $prg OpenEphemeral]
    expr {$idx>=0}
  } $use_eph

  do_execsql_test 4.$tn.2 $sql $res
}


set t3root [db one {SELECT rootpage FROM sqlite_schema WHERE name='t3'}]
foreach {tn use_t3 sql res} {
  1 1 "SELECT count(*) FROM t3"   2
  2 0 "SELECT count(*) FROM t1"   10
  2 1 "SELECT count(DISTINCT a) FROM t1, t3" 4
  3 1 "SELECT count(DISTINCT a) FROM t1 LEFT JOIN t3" 4
  4 1 "SELECT count(DISTINCT a) FROM t1 LEFT JOIN t3 WHERE t3.x=1" 4
  5 1 "SELECT count(DISTINCT a) FROM t1 LEFT JOIN t3 WHERE t3.x=0" 0
  6 1 "SELECT count(DISTINCT a) FROM t1 LEFT JOIN t3 ON (t3.x=0)"  4
  7 1 "SELECT count(DISTINCT x) FROM t1 LEFT JOIN t3" 2
  8 1 "SELECT count(DISTINCT x) FROM t1 LEFT JOIN t3 WHERE t3.x=1" 1
  9 1 "SELECT count(DISTINCT x) FROM t1 LEFT JOIN t3 WHERE t3.x=0" 0
 10 1 "SELECT count(DISTINCT x) FROM t1 LEFT JOIN t3 ON (t3.x=0)"  0

} {
  unset -nocomplain a
  do_test 5.$tn.1 {
    set bUse 0
    db eval "EXPLAIN $sql" a {
      if {$a(opcode)=="OpenRead" && $a(p2)==$t3root} {set bUse 1}
    }
    set bUse
  } $use_t3

  do_execsql_test 5.$tn.2 $sql $res
}

#-------------------------------------------------------------------------
reset_db
do_execsql_test 6.0 {
  CREATE TABLE t1(a, b);
  CREATE TABLE t2(c, d);
  INSERT INTO t1 VALUES(123,456);
  INSERT INTO t2 VALUES(123,456);
}
do_execsql_test 6.1 {
  SELECT count(DISTINCT c) FROM t1 LEFT JOIN t2;
} {1}

do_execsql_test 7.0 {
  CREATE TABLE v1 ( v2 UNIQUE, v3 AS( TYPEOF ( NULL ) ) UNIQUE ); 
  SELECT COUNT ( DISTINCT TRUE ) FROM v1 GROUP BY likelihood ( v3 , 0.100000 );
}


finish_test