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Within a loop that uses a non-covering index test, test non-indexed terms that

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can be tested without seeking the main table cursor before those that cannot.

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dan
2017-04-28 19:59:55 +00:00
parent 4b17369579
commit 6f654a40e8
4 changed files with 115 additions and 40 deletions
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test/pushdown.test Normal file
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# 2017 April 29
#
# 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.
#
#***********************************************************************
set testdir [file dirname $argv0]
source $testdir/tester.tcl
set testprefix pushdown
do_execsql_test 1.0 {
CREATE TABLE t1(a, b, c);
INSERT INTO t1 VALUES(1, 'b1', 'c1');
INSERT INTO t1 VALUES(2, 'b2', 'c2');
INSERT INTO t1 VALUES(3, 'b3', 'c3');
INSERT INTO t1 VALUES(4, 'b4', 'c4');
CREATE INDEX i1 ON t1(a, c);
}
proc f {val} {
lappend ::L $val
return 0
}
db func f f
do_test 1.1 {
set L [list]
execsql { SELECT * FROM t1 WHERE a=2 AND f(b) AND f(c) }
set L
} {c2}
do_test 1.2 {
set L [list]
execsql { SELECT * FROM t1 WHERE a=3 AND f(c) AND f(b) }
set L
} {c3}
do_execsql_test 1.3 {
DROP INDEX i1;
CREATE INDEX i1 ON t1(a, b);
}
do_test 1.4 {
set L [list]
execsql { SELECT * FROM t1 WHERE a=2 AND f(b) AND f(c) }
set L
} {b2}
do_test 1.5 {
set L [list]
execsql { SELECT * FROM t1 WHERE a=3 AND f(c) AND f(b) }
set L
} {b3}
finish_test