sqlite/test/tkt2822.test

# 2007 Dec 4
#
# 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 is to test that the issues surrounding expressions in
# ORDER BY clauses on compound SELECT statements raised by ticket
# #2822 have been dealt with.
#
# $Id: tkt2822.test,v 1.1 2007/12/10 18:51:48 danielk1977 Exp $
#

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

# Test plan:
#
#   tkt2820-1.* - Simple identifier as ORDER BY expression.
#   tkt2820-2.* - More complex ORDER BY expressions.

do_test tkt2820-1.1 {
  execsql {
    CREATE TABLE t1(a, b, c);
    CREATE TABLE t2(c, b, a);

    INSERT INTO t1 VALUES(1, 2, 3);
    INSERT INTO t2 VALUES(3, 2, 1);
  }
} {}

# If an ORDER BY expression matches two different columns, it is an error.
#
do_test tkt2820-1.2 {
  catchsql {
    SELECT a, b FROM t1 UNION ALL SELECT b, a FROM t2 ORDER BY a;
  }
} {1 {ORDER BY term number 1 is ambiguous}}
do_test tkt2820-1.3 {
  catchsql {
    SELECT a, b, c FROM t2 UNION ALL SELECT c, b, a FROM t1 ORDER BY a;
  }
} {1 {ORDER BY term number 1 is ambiguous}}

# But not if it matches the same column in two or more of the
# compounded SELECT statements.
#
do_test tkt2820-1.4 {
  execsql {
    SELECT a, b, c FROM t2 UNION ALL SELECT a, b, c FROM t1 ORDER BY a;
  }
} {1 2 3 1 2 3}

do_test tkt2820-1.5 {
  execsql {
    SELECT a, b FROM t2 UNION ALL SELECT c, b FROM t1 ORDER BY c;
  }
} {1 2 3 2}

# If a match cannot be found in any SELECT, return an error.
#
do_test tkt2820-1.6 {
  catchsql {
    SELECT * FROM t2 UNION ALL SELECT * FROM t1 ORDER BY d;
  }
} {1 {ORDER BY term number 1 does not match any result column}}


do_test tkt2820-2.1 {
  execsql {
    SELECT a+1, b+1 FROM t1 UNION ALL SELECT a, c FROM t2 ORDER BY a+1;
  }
} {1 3 2 3}
do_test tkt2820-2.2 {
  catchsql {
    SELECT a+1, b+1 FROM t1 UNION ALL SELECT a, c FROM t2 ORDER BY a+2;
  }
} {1 {ORDER BY term number 1 does not match any result column}}
do_test tkt2820-2.3 {
  catchsql {
    SELECT a+1, b+1 FROM t1 UNION ALL SELECT c, a+1 FROM t2 ORDER BY a+1;
  }
} {1 {ORDER BY term number 1 is ambiguous}}

do_test tkt2820-2.4 {
  execsql {
    SELECT t1.a, b+1 FROM t1 UNION ALL SELECT c, a+1 FROM t2 ORDER BY a;
  }
} {1 3 3 2}
do_test tkt2820-2.5 {
  execsql {
    SELECT t1.a, b+1 FROM t1 UNION ALL SELECT c, a+1 FROM t2 ORDER BY t1.a;
  }
} {1 3 3 2}

finish_test