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A few simple test cases for the omit-unused-subquery-column optimization.

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drh
2023-02-16 19:41:39 +00:00
parent 7defd20cb0
commit e43d101c83
3 changed files with 117 additions and 6 deletions
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# 2023-02-16
#
# 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 cases for the omit-unused-subquery-column optimization.
#
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix selectH
do_execsql_test 1.1 {
CREATE TABLE t1(
c0, c1, c2, c3, c4, c5, c6, c7, c8, c9,
c10, c11, c12, c13, c14, c15, c16, c17, c18, c19,
c20, c21, c22, c23, c24, c25, c26, c27, c28, c29,
c30, c31, c32, c33, c34, c35, c36, c37, c38, c39,
c40, c41, c42, c43, c44, c45, c46, c47, c48, c49,
c50, c51, c52, c53, c54, c55, c56, c57, c58, c59,
c60, c61, c62, c63, c64, c65
);
INSERT INTO t1 VALUES(
0, 1, 2, 3, 4, 5, 6, 7, 8, 9,
10, 11, 12, 13, 14, 15, 16, 17, 18, 19,
20, 21, 22, 23, 24, 25, 26, 27, 28, 29,
30, 31, 32, 33, 34, 35, 36, 37, 38, 39,
40, 41, 42, 43, 44, 45, 46, 47, 48, 49,
50, 51, 52, 53, 54, 55, 56, 57, 58, 59,
60, 61, 62, 63, 64, 65
);
CREATE INDEX t1c60 ON t1(c60);
}
# The SQL counter(N) function adjusts the value of the global
# TCL variable ::selectH_cnt by the value N and returns the new
# value. By putting calls to counter(N) as unused columns in a
# view or subquery, we can check to see if the counter gets incremented,
# and if not that means that the unused column was omitted.
#
unset -nocomplain selectH_cnt
set selectH_cnt 0
proc selectH_counter {amt} {
global selectH_cnt
incr selectH_cnt $amt
return $selectH_cnt
}
db func counter selectH_counter
do_execsql_test 1.2 {
SELECT DISTINCT c44 FROM (
SELECT c0 AS a, *, counter(1) FROM t1
UNION ALL
SELECT c1 AS a, *, counter(1) FROM t1
) WHERE c60=60;
} {44}
do_test 1.3 {
set ::selectH_cnt
} {0}
do_execsql_test 2.1 {
SELECT a FROM (
SELECT counter(1) AS cnt, c15 AS a, *, c62 AS b FROM t1
UNION ALL
SELECT counter(1) AS cnt, c16 AS a, *, c61 AS b FROM t1
ORDER BY b
);
} {16 15}
do_test 2.2 {
set ::selectH_cnt
} {0}
do_execsql_test 3.1 {
CREATE VIEW v1 AS
SELECT c16 AS a, *, counter(1) AS x FROM t1
UNION ALL
SELECT c17 AS a, *, counter(1) AS x FROM t1
UNION ALL
SELECT c18 AS a, *, counter(1) AS x FROM t1
UNION ALL
SELECT c19 AS a, *, counter(1) AS x FROM t1;
SELECT count(*) FROM v1 WHERE c60=60;
} {4}
do_test 3.2 {
set ::selectH_cnt
} {0}
do_execsql_test 3.3 {
SELECT count(a) FROM v1 WHERE c60=60;
} {4}
do_execsql_test 3.4 {
SELECT a FROM v1 WHERE c60=60;
} {16 17 18 19}
do_test 3.5 {
set ::selectH_cnt
} {0}
do_execsql_test 3.6 {
SELECT x FROM v1 WHERE c60=60;
} {1 2 3 4}
do_test 3.7 {
set ::selectH_cnt
} {4}
finish_test