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313 lines
9.1 KiB
Plaintext
313 lines
9.1 KiB
Plaintext
# 2012 November 9
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#
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# The author disclaims copyright to this source code. In place of
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# a legal notice, here is a blessing:
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#
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# May you do good and not evil.
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# May you find forgiveness for yourself and forgive others.
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# May you share freely, never taking more than you give.
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#
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#***********************************************************************
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#
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# Test cases for query planning decisions.
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#
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# The tests in this file demonstrate the behaviour of the query planner
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# in determining the order in which joined tables are scanned.
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#
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# Assume there are two tables being joined - t1 and t2. Each has a cost
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# if it is the outer loop, and a cost if it is the inner loop. As follows:
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#
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# t1(outer) - cost of scanning t1 as the outer loop.
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# t1(inner) - cost of scanning t1 as the inner loop.
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# t2(outer) - cost of scanning t2 as the outer loop.
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# t2(inner) - cost of scanning t2 as the inner loop.
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#
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# Depending on the order in which the planner nests the scans, the total
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# cost of the join query is one of:
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#
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# t1(outer) * t2(inner)
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# t2(outer) * t1(inner)
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#
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# The tests in this file attempt to verify that the planner nests joins in
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# the correct order when the following are true:
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#
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# + (t1(outer) * t2(inner)) > (t1(inner) * t2(outer)
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# + t1(outer) < t2(outer)
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#
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# In other words, when the best overall query plan has t2 as the outer loop,
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# but when the outer loop is considered independent of the inner, t1 is the
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# most efficient choice.
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#
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# In order to make them more predictable, automatic indexes are turned off for
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# the tests in this file.
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#
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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set testprefix whereF
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do_execsql_test 1.0 {
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PRAGMA automatic_index = 0;
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CREATE TABLE t1(a, b, c);
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CREATE TABLE t2(d, e, f);
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CREATE UNIQUE INDEX i1 ON t1(a);
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CREATE UNIQUE INDEX i2 ON t2(d);
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} {}
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foreach {tn sql} {
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1 "SELECT * FROM t1, t2 WHERE t1.a=t2.e AND t2.d<t1.b AND t1.c!=10"
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2 "SELECT * FROM t2, t1 WHERE t1.a=t2.e AND t2.d<t1.b AND t1.c!=10"
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3 "SELECT * FROM t2 CROSS JOIN t1 WHERE t1.a=t2.e AND t2.d<t1.b AND t1.c!=10"
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} {
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do_test 1.$tn {
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db eval "EXPLAIN QUERY PLAN $sql"
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} {/.*SCAN t2\y.*SEARCH t1\y.*/}
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}
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do_execsql_test 2.0 {
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DROP TABLE t1;
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DROP TABLE t2;
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CREATE TABLE t1(a, b, c);
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CREATE TABLE t2(d, e, f);
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CREATE UNIQUE INDEX i1 ON t1(a);
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CREATE UNIQUE INDEX i2 ON t1(b);
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CREATE UNIQUE INDEX i3 ON t2(d);
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} {}
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foreach {tn sql} {
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1 "SELECT * FROM t1, t2 WHERE t1.a>? AND t2.d>t1.c AND t1.b=t2.e"
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2 "SELECT * FROM t2, t1 WHERE t1.a>? AND t2.d>t1.c AND t1.b=t2.e"
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3 "SELECT * FROM t2 CROSS JOIN t1 WHERE t1.a>? AND t2.d>t1.c AND t1.b=t2.e"
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} {
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do_test 2.$tn {
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db eval "EXPLAIN QUERY PLAN $sql"
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} {/.*SCAN t2\y.*SEARCH t1\y.*/}
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}
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do_execsql_test 3.0 {
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DROP TABLE t1;
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DROP TABLE t2;
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CREATE TABLE t1(a, b, c);
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CREATE TABLE t2(d, e, f);
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CREATE UNIQUE INDEX i1 ON t1(a, b);
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CREATE INDEX i2 ON t2(d);
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} {}
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foreach {tn sql} {
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1 {SELECT t1.a, t1.b, t2.d, t2.e FROM t1, t2
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WHERE t2.d=t1.b AND t1.a=(t2.d+1) AND t1.b = (t2.e+1)}
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2 {SELECT t1.a, t1.b, t2.d, t2.e FROM t2, t1
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WHERE t2.d=t1.b AND t1.a=(t2.d+1) AND t1.b = (t2.e+1)}
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3 {SELECT t1.a, t1.b, t2.d, t2.e FROM t2 CROSS JOIN t1
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WHERE t2.d=t1.b AND t1.a=(t2.d+1) AND t1.b = (t2.e+1)}
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} {
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do_test 3.$tn {
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db eval "EXPLAIN QUERY PLAN $sql"
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} {/.*SCAN t2\y.*SEARCH t1\y.*/}
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}
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do_execsql_test 4.0 {
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CREATE TABLE t4(a,b,c,d,e, PRIMARY KEY(a,b,c));
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CREATE INDEX t4adc ON t4(a,d,c);
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CREATE UNIQUE INDEX t4aebc ON t4(a,e,b,c);
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EXPLAIN QUERY PLAN SELECT rowid FROM t4 WHERE a=? AND b=?;
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} {/a=. AND b=./}
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#-------------------------------------------------------------------------
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# Test the following case:
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#
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# ... FROM t1, t2 WHERE (
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# t2.rowid = +t1.rowid OR (t2.f2 = t1.f1 AND t1.f1!=-1)
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# )
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#
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# where there is an index on t2(f2). The planner should use "t1" as the
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# outer loop. The inner loop, on "t2", is an OR optimization. One pass
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# for:
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#
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# t2.rowid = $1
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#
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# and another for:
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#
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# t2.f2=$1 AND $1!=-1
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#
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# the test is to ensure that on the second pass, the ($1!=-1) condition
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# is tested before any seek operations are performed - i.e. outside of
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# the loop through the f2=$1 range of the t2(f2) index.
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#
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reset_db
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do_execsql_test 5.0 {
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CREATE TABLE t1(f1);
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CREATE TABLE t2(f2);
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CREATE INDEX t2f ON t2(f2);
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INSERT INTO t1 VALUES(-1);
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INSERT INTO t1 VALUES(-1);
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INSERT INTO t1 VALUES(-1);
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INSERT INTO t1 VALUES(-1);
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WITH w(i) AS (
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SELECT 1 UNION ALL SELECT i+1 FROM w WHERE i<1000
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)
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INSERT INTO t2 SELECT -1 FROM w;
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}
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do_execsql_test 5.1 {
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SELECT count(*) FROM t1, t2 WHERE t2.rowid = +t1.rowid
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} {4}
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do_test 5.2 { expr [db status vmstep]<200 } 1
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do_execsql_test 5.3 {
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SELECT count(*) FROM t1, t2 WHERE (
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t2.rowid = +t1.rowid OR t2.f2 = t1.f1
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)
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} {4000}
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do_test 5.4 { expr [db status vmstep]>1000 } 1
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do_execsql_test 5.5 {
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SELECT count(*) FROM t1, t2 WHERE (
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t2.rowid = +t1.rowid OR (t2.f2 = t1.f1 AND t1.f1!=-1)
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)
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} {4}
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do_test 5.6 { expr [db status vmstep]<200 } 1
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# 2017-09-04 ticket b899b6042f97f52d
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# Segfault on correlated subquery...
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#
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ifcapable json1&&vtab {
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do_execsql_test 6.1 {
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CREATE TABLE t6(x);
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SELECT * FROM t6 WHERE 1 IN (SELECT value FROM json_each(x));
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} {}
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do_execsql_test 6.2 {
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DROP TABLE t6;
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CREATE TABLE t6(a,b,c);
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INSERT INTO t6 VALUES
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(0,null,'{"a":0,"b":[3,4,5],"c":{"x":4.5,"y":7.8}}'),
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(1,null,'{"a":1,"b":[3,4,5],"c":{"x":4.5,"y":7.8}}'),
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(2,null,'{"a":9,"b":[3,4,5],"c":{"x":4.5,"y":7.8}}');
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SELECT * FROM t6
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WHERE (EXISTS (SELECT 1 FROM json_each(t6.c) AS x WHERE x.value=1));
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} {1 {} {{"a":1,"b":[3,4,5],"c":{"x":4.5,"y":7.8}}}}
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# Another test case derived from a posting by Wout Mertens on the
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# sqlite-users mailing list on 2017-10-04.
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do_execsql_test 6.3 {
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DROP TABLE IF EXISTS t;
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CREATE TABLE t(json JSON);
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SELECT * FROM t
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WHERE(EXISTS(SELECT 1 FROM json_each(t.json,"$.foo") j
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WHERE j.value = 'meep'));
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} {}
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do_execsql_test 6.4 {
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INSERT INTO t VALUES('{"xyzzy":null}');
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INSERT INTO t VALUES('{"foo":"meep","other":12345}');
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INSERT INTO t VALUES('{"foo":"bingo","alt":5.25}');
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SELECT * FROM t
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WHERE(EXISTS(SELECT 1 FROM json_each(t.json,"$.foo") j
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WHERE j.value = 'meep'));
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} {{{"foo":"meep","other":12345}}}
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}
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# 2018-01-27
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# Ticket https://sqlite.org/src/tktview/ec32177c99ccac2b180fd3ea2083
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# Incorrect result when using the new OR clause factoring optimization
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#
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# This is the original test case as reported on the sqlite-users mailing
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# list
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#
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do_execsql_test 7.1 {
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DROP TABLE IF EXISTS cd;
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CREATE TABLE cd ( cdid INTEGER PRIMARY KEY NOT NULL, genreid integer );
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CREATE INDEX cd_idx_genreid ON cd (genreid);
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INSERT INTO cd ( cdid, genreid ) VALUES
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( 1, 1 ),
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( 2, NULL ),
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( 3, NULL ),
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( 4, NULL ),
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( 5, NULL );
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SELECT cdid
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FROM cd me
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WHERE 2 > (
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SELECT COUNT( * )
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FROM cd rownum__emulation
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WHERE
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(
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me.genreid IS NOT NULL
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AND
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rownum__emulation.genreid IS NULL
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)
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OR
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(
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me.genreid IS NOT NULL
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AND
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rownum__emulation.genreid IS NOT NULL
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AND
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rownum__emulation.genreid < me.genreid
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)
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OR
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(
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( me.genreid = rownum__emulation.genreid OR ( me.genreid IS NULL
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AND rownum__emulation.genreid IS NULL ) )
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AND
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rownum__emulation.cdid > me.cdid
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)
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);
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} {4 5}
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# Simplified test cases from the ticket
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#
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do_execsql_test 7.2 {
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DROP TABLE IF EXISTS t1;
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DROP TABLE IF EXISTS t2;
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CREATE TABLE t1(a INTEGER PRIMARY KEY, b);
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INSERT INTO t1(a,b) VALUES(1,1);
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CREATE TABLE t2(aa INTEGER PRIMARY KEY, bb);
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INSERT INTO t2(aa,bb) VALUES(1,1),(2,NULL),(3,NULL);
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SELECT (
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SELECT COUNT(*) FROM t2
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WHERE ( t1.b IS NOT NULL AND t2.bb IS NULL )
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OR ( t2.bb < t1.b )
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OR ( t1.b IS t2.bb AND t2.aa > t1.a )
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)
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FROM t1;
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} {2}
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# The fix for ticket ec32177c99ccac2b180fd3ea2083 only makes a difference
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# in the output when there is a TERM_VNULL entry in the WhereClause array.
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# And TERM_VNULL entries are only generated when compiling with
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# SQLITE_ENABLE_STAT4. Nevertheless, it is correct that TERM_VIRTUAL terms
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# should not participate in the factoring optimization. In all cases other
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# than TERM_VNULL, participation is harmless, but it does consume a few
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# extra CPU cycles.
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#
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# The following test verifies that the TERM_VIRTUAL terms resulting from
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# a GLOB operator do not appear anywhere in the generated code. This
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# confirms that the problem is fixed, even on builds that omit STAT4.
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#
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do_execsql_test 7.3 {
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DROP TABLE IF EXISTS t1;
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DROP TABLE IF EXISTS t2;
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CREATE TABLE t1(a INTEGER PRIMARY KEY, b TEXT);
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INSERT INTO t1(a,b) VALUES(1,'abcxyz');
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CREATE TABLE t2(aa INTEGER PRIMARY KEY, bb TEXT);
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INSERT INTO t2(aa,bb) VALUES(1,'abc'),(2,'wxyz'),(3,'xyz');
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CREATE INDEX t2bb ON t2(bb);
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EXPLAIN SELECT (
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SELECT COUNT(*) FROM t2
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WHERE ( t1.b GLOB 'a*z' AND t2.bb='xyz' )
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OR ( t2.bb = t1.b )
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OR ( t2.aa = t1.a )
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)
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FROM t1;
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} {~/ (Lt|Ge) /}
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finish_test
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