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# 2014-04-21
#
# 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.
#
#*************************************************************************
#
# Test that ticket [b75a9ca6b0] has been fixed.
#
# Ticket [b75a9ca6b0] concerns queries that have both a GROUP BY
# and an ORDER BY. This code verifies that SQLite is able to
# optimize out the ORDER BY in some circumstances, but retains the
# ORDER BY when necessary.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix tkt-b75a9ca6b0
do_execsql_test 1 {
CREATE TABLE t1 (x, y);
INSERT INTO t1 VALUES (1, 3);
INSERT INTO t1 VALUES (2, 2);
INSERT INTO t1 VALUES (3, 1);
}
do_execsql_test 1.1 {
CREATE INDEX i1 ON t1(x, y);
}
set idxscan {0 0 0 {SCAN TABLE t1 USING COVERING INDEX i1}}
set tblscan {0 0 0 {SCAN TABLE t1}}
set grpsort {0 0 0 {USE TEMP B-TREE FOR GROUP BY}}
set sort {0 0 0 {USE TEMP B-TREE FOR ORDER BY}}
foreach {tn q res eqp} [subst -nocommands {
1 "SELECT * FROM t1 GROUP BY x, y ORDER BY x,y"
{1 3 2 2 3 1} {$idxscan}
2 "SELECT * FROM t1 GROUP BY x, y ORDER BY x"
{1 3 2 2 3 1} {$idxscan $sort}
3 "SELECT * FROM t1 GROUP BY y, x ORDER BY y, x"
{3 1 2 2 1 3} {$idxscan $sort}
4 "SELECT * FROM t1 GROUP BY x ORDER BY x"
{1 3 2 2 3 1} {$idxscan}
5 "SELECT * FROM t1 GROUP BY y ORDER BY y"
{3 1 2 2 1 3} {$tblscan $grpsort}
6 "SELECT * FROM t1 GROUP BY y ORDER BY x"
{1 3 2 2 3 1} {$tblscan $grpsort $sort}
7 "SELECT * FROM t1 GROUP BY x, y ORDER BY x, y DESC"
{1 3 2 2 3 1} {$idxscan $sort}
8 "SELECT * FROM t1 GROUP BY x, y ORDER BY x DESC, y DESC"
{3 1 2 2 1 3} {$idxscan $sort}
9 "SELECT * FROM t1 GROUP BY x, y ORDER BY x ASC, y ASC"
{1 3 2 2 3 1} {$idxscan}
10 "SELECT * FROM t1 GROUP BY x, y ORDER BY x COLLATE nocase, y"
{1 3 2 2 3 1} {$idxscan $sort}
}] {
do_execsql_test 1.$tn.1 $q $res
do_eqp_test 1.$tn.2 $q $eqp
}
finish_test
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