3 # The author disclaims copyright to this source code. In place of
4 # a legal notice, here is a blessing:
6 # May you do good and not evil.
7 # May you find forgiveness for yourself and forgive others.
8 # May you share freely, never taking more than you give.
10 #***********************************************************************
12 # This file implements tests of the "skip-scan" query strategy.
13 # In particular, this file looks at skipping intermediate terms
14 # in an index. For example, if (a,b,c) are indexed, and we have
15 # "WHERE a=?1 AND c=?2" - verify that skip-scan can still be used.
18 set testdir [file dirname $argv0]
19 source $testdir/tester.tcl
21 do_execsql_test skipscan3-1.1 {
22 CREATE TABLE t1(a,b,c,d,PRIMARY KEY(a,b,c));
24 c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
25 INSERT INTO t1(a,b,c,d)
26 SELECT 1, 1, x, printf('x%04d',x) FROM c;
30 # This version has long used skip-scan because of the "+a"
32 do_execsql_test skipscan3-1.2eqp {
33 EXPLAIN QUERY PLAN SELECT d FROM t1 WHERE +a=1 AND c=32;
34 } {/*ANY(a) AND ANY(b)*/}
35 do_execsql_test skipscan3-1.2 {
36 SELECT d FROM t1 WHERE +a=1 AND c=32;
39 # This version (with "a" instead of "+a") should use skip-scan but
40 # did not prior to changes implemented on 2014-08-20
42 do_execsql_test skipscan3-1.3eqp {
43 EXPLAIN QUERY PLAN SELECT d FROM t1 WHERE a=1 AND c=32;
44 } {/*ANY(a) AND ANY(b)*/}
45 do_execsql_test skipscan3-1.3 {
46 SELECT d FROM t1 WHERE a=1 AND c=32;
49 # Repeat the test on a WITHOUT ROWID table
51 do_execsql_test skipscan3-2.1 {
52 CREATE TABLE t2(a,b,c,d,PRIMARY KEY(a,b,c)) WITHOUT ROWID;
54 c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
55 INSERT INTO t2(a,b,c,d)
56 SELECT 1, 1, x, printf('x%04d',x) FROM c;
59 do_execsql_test skipscan3-2.2eqp {
60 EXPLAIN QUERY PLAN SELECT d FROM t2 WHERE +a=1 AND c=32;
61 } {/*ANY(a) AND ANY(b)*/}
62 do_execsql_test skipscan3-2.2 {
63 SELECT d FROM t2 WHERE +a=1 AND c=32;
65 do_execsql_test skipscan3-2.3eqp {
66 EXPLAIN QUERY PLAN SELECT d FROM t2 WHERE a=1 AND c=32;
67 } {/*ANY(a) AND ANY(b)*/}
68 do_execsql_test skipscan3-2.3 {
69 SELECT d FROM t2 WHERE a=1 AND c=32;