mirror of
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235b5d0ac5
in helping to satisfy the ORDER BY or GROUP BY in the order query without doing an extra sort, then omit the extra sort. FossilOrigin-Name: 2fbb4dc2327ee435cb2b7a4adcddf5a9cee6dff7de96e2ecb761166427b5ddea
433 lines
14 KiB
Plaintext
433 lines
14 KiB
Plaintext
# 2013-11-13
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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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# This file implements tests of the "skip-scan" query strategy.
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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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do_execsql_test skipscan1-1.1 {
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CREATE TABLE t1(a TEXT, b INT, c INT, d INT);
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CREATE INDEX t1abc ON t1(a,b,c);
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INSERT INTO t1 VALUES('abc',123,4,5);
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INSERT INTO t1 VALUES('abc',234,5,6);
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INSERT INTO t1 VALUES('abc',234,6,7);
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INSERT INTO t1 VALUES('abc',345,7,8);
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INSERT INTO t1 VALUES('def',567,8,9);
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INSERT INTO t1 VALUES('def',345,9,10);
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INSERT INTO t1 VALUES('bcd',100,6,11);
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/* Fake the sqlite_stat1 table so that the query planner believes
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** the table contains thousands of rows and that the first few
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** columns are not selective. */
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ANALYZE;
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DELETE FROM sqlite_stat1;
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INSERT INTO sqlite_stat1 VALUES('t1','t1abc','10000 5000 2000 10');
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ANALYZE sqlite_master;
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} {}
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# Simple queries that leave the first one or two columns of the
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# index unconstrainted.
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#
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do_execsql_test skipscan1-1.2 {
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SELECT a,b,c,d,'|' FROM t1 WHERE b=345 ORDER BY a;
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} {abc 345 7 8 | def 345 9 10 |}
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do_execsql_test skipscan1-1.2eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE d<>99 AND b=345 ORDER BY a;
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} {/* USING INDEX t1abc (ANY(a) AND b=?)*/}
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do_execsql_test skipscan1-1.2sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE d<>99 AND b=345 ORDER BY a;
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} {~/*ORDER BY*/}
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do_execsql_test skipscan1-1.3 {
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SELECT a,b,c,d,'|' FROM t1 WHERE d<>99 AND b=345 ORDER BY a DESC;
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} {def 345 9 10 | abc 345 7 8 |}
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do_execsql_test skipscan1-1.3eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE d<>99 AND b=345 ORDER BY a DESC;
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} {/* USING INDEX t1abc (ANY(a) AND b=?)*/}
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do_execsql_test skipscan1-1.3sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE d<>99 AND b=345 ORDER BY a DESC;
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} {~/*ORDER BY*/}
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do_execsql_test skipscan1-1.4 {
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SELECT a,b,c,d,'|' FROM t1 WHERE c=6 ORDER BY a, b, c;
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} {abc 234 6 7 | bcd 100 6 11 |}
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do_execsql_test skipscan1-1.4eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE c=6 ORDER BY a, b, c;
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} {/* USING INDEX t1abc (ANY(a) AND ANY(b) AND c=?)*/}
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do_execsql_test skipscan1-1.4sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE c=6 ORDER BY a, b, c;
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} {~/*ORDER BY*/}
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do_execsql_test skipscan1-1.5 {
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SELECT a,b,c,d,'|' FROM t1 WHERE c IN (6,7) ORDER BY a, b, c;
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} {abc 234 6 7 | abc 345 7 8 | bcd 100 6 11 |}
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do_execsql_test skipscan1-1.5eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE c IN (6,7) ORDER BY a, b, c;
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} {/* USING INDEX t1abc (ANY(a) AND ANY(b) AND c=?)*/}
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do_execsql_test skipscan1-1.5sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE c IN (6,7) ORDER BY a, b, c;
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} {~/*ORDER BY*/}
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do_execsql_test skipscan1-1.6 {
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SELECT a,b,c,d,'|' FROM t1 WHERE c BETWEEN 6 AND 7 ORDER BY a, b, c;
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} {abc 234 6 7 | abc 345 7 8 | bcd 100 6 11 |}
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do_execsql_test skipscan1-1.6eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE c BETWEEN 6 AND 7 ORDER BY a, b, c;
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} {/* USING INDEX t1abc (ANY(a) AND ANY(b) AND c>? AND c<?)*/}
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do_execsql_test skipscan1-1.6sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE c BETWEEN 6 AND 7 ORDER BY a, b, c;
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} {~/*ORDER BY*/}
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do_execsql_test skipscan1-1.7 {
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SELECT a,b,c,d,'|' FROM t1 WHERE b IN (234, 345) AND c BETWEEN 6 AND 7
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ORDER BY a, b;
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} {abc 234 6 7 | abc 345 7 8 |}
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do_execsql_test skipscan1-1.7eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE b IN (234, 345) AND c BETWEEN 6 AND 7
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ORDER BY a, b;
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} {/* USING INDEX t1abc (ANY(a) AND b=? AND c>? AND c<?)*/}
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do_execsql_test skipscan1-1.7sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t1 WHERE b IN (234, 345) AND c BETWEEN 6 AND 7
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ORDER BY a, b;
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} {~/*ORDER BY*/}
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# Joins
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#
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do_execsql_test skipscan1-1.51 {
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CREATE TABLE t1j(x TEXT, y INTEGER);
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INSERT INTO t1j VALUES('one',1),('six',6),('ninty-nine',99);
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INSERT INTO sqlite_stat1 VALUES('t1j',null,'3');
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ANALYZE sqlite_master;
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SELECT x, a, b, c, d, '|' FROM t1j, t1 WHERE c=y ORDER BY +a;
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} {six abc 234 6 7 | six bcd 100 6 11 |}
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do_execsql_test skipscan1-1.51eqp {
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EXPLAIN QUERY PLAN
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SELECT x, a, b, c, d, '|' FROM t1j, t1 WHERE c=y ORDER BY +a;
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} {/* INDEX t1abc (ANY(a) AND ANY(b) AND c=?)*/}
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do_execsql_test skipscan1-1.52 {
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SELECT x, a, b, c, d, '|' FROM t1j LEFT JOIN t1 ON c=y ORDER BY +y, +a;
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} {one {} {} {} {} | six abc 234 6 7 | six bcd 100 6 11 | ninty-nine {} {} {} {} |}
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do_execsql_test skipscan1-1.52eqp {
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EXPLAIN QUERY PLAN
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SELECT x, a, b, c, d, '|' FROM t1j LEFT JOIN t1 ON c=y ORDER BY +y, +a;
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} {/* INDEX t1abc (ANY(a) AND ANY(b) AND c=?)*/}
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do_execsql_test skipscan1-2.1 {
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CREATE TABLE t2(a TEXT, b INT, c INT, d INT,
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PRIMARY KEY(a,b,c));
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INSERT INTO t2 SELECT * FROM t1;
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/* Fake the sqlite_stat1 table so that the query planner believes
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** the table contains thousands of rows and that the first few
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** columns are not selective. */
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ANALYZE;
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UPDATE sqlite_stat1 SET stat='10000 5000 2000 10' WHERE idx NOT NULL;
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ANALYZE sqlite_master;
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} {}
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do_execsql_test skipscan1-2.2 {
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SELECT a,b,c,d,'|' FROM t2 WHERE d<>99 AND b=345 ORDER BY a;
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} {abc 345 7 8 | def 345 9 10 |}
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do_execsql_test skipscan1-2.2eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t2 WHERE d<>99 AND b=345 ORDER BY a;
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} {/* USING INDEX sqlite_autoindex_t2_1 (ANY(a) AND b=?)*/}
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do_execsql_test skipscan1-2.2sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t2 WHERE d<>99 AND b=345 ORDER BY a;
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} {~/*ORDER BY*/}
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do_execsql_test skipscan1-3.1 {
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CREATE TABLE t3(a TEXT, b INT, c INT, d INT,
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PRIMARY KEY(a,b,c)) WITHOUT ROWID;
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INSERT INTO t3 SELECT * FROM t1;
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/* Fake the sqlite_stat1 table so that the query planner believes
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** the table contains thousands of rows and that the first few
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** columns are not selective. */
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ANALYZE;
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UPDATE sqlite_stat1 SET stat='10000 5000 2000 10' WHERE idx NOT NULL;
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ANALYZE sqlite_master;
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} {}
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do_execsql_test skipscan1-3.2 {
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SELECT a,b,c,d,'|' FROM t3 WHERE b=345 ORDER BY a;
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} {abc 345 7 8 | def 345 9 10 |}
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do_execsql_test skipscan1-3.2eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t3 WHERE b=345 ORDER BY a;
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} {/* PRIMARY KEY (ANY(a) AND b=?)*/}
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do_execsql_test skipscan1-3.2sort {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t3 WHERE b=345 ORDER BY a;
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} {~/*ORDER BY*/}
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# Ticket 520070ec7fbaac: Array overrun in the skip-scan optimization
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# 2013-12-22
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#
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do_execsql_test skipscan1-4.1 {
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CREATE TABLE t4(a,b,c,d,e,f,g,h,i);
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CREATE INDEX t4all ON t4(a,b,c,d,e,f,g,h);
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INSERT INTO t4 VALUES(1,2,3,4,5,6,7,8,9);
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ANALYZE;
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DELETE FROM sqlite_stat1;
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INSERT INTO sqlite_stat1
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VALUES('t4','t4all','655360 163840 40960 10240 2560 640 160 40 10');
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ANALYZE sqlite_master;
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SELECT i FROM t4 WHERE a=1;
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SELECT i FROM t4 WHERE b=2;
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SELECT i FROM t4 WHERE c=3;
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SELECT i FROM t4 WHERE d=4;
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SELECT i FROM t4 WHERE e=5;
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SELECT i FROM t4 WHERE f=6;
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SELECT i FROM t4 WHERE g=7;
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SELECT i FROM t4 WHERE h=8;
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} {9 9 9 9 9 9 9 9}
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# Make sure skip-scan cost computation in the query planner takes into
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# account the fact that the seek must occur multiple times.
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#
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# Prior to 2014-03-10, the costs were computed incorrectly which would
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# cause index t5i2 to be used instead of t5i1 on the skipscan1-5.3.
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#
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do_execsql_test skipscan1-5.1 {
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CREATE TABLE t5(
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id INTEGER PRIMARY KEY,
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loc TEXT,
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lang INTEGER,
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utype INTEGER,
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xa INTEGER,
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xd INTEGER,
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xh INTEGER
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);
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CREATE INDEX t5i1 on t5(loc, xh, xa, utype, lang);
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CREATE INDEX t5i2 ON t5(xd,loc,utype,lang);
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EXPLAIN QUERY PLAN
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SELECT xh, loc FROM t5 WHERE loc >= 'M' AND loc < 'N';
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} {/.*COVERING INDEX t5i1 .*/}
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do_execsql_test skipscan1-5.2 {
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ANALYZE;
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DELETE FROM sqlite_stat1;
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DROP TABLE IF EXISTS sqlite_stat4;
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INSERT INTO sqlite_stat1 VALUES('t5','t5i1','2702931 3 2 2 2 2');
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INSERT INTO sqlite_stat1 VALUES('t5','t5i2','2702931 686 2 2 2');
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ANALYZE sqlite_master;
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} {}
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db cache flush
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do_execsql_test skipscan1-5.3 {
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EXPLAIN QUERY PLAN
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SELECT xh, loc FROM t5 WHERE loc >= 'M' AND loc < 'N';
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} {/.*COVERING INDEX t5i1 .*/}
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# The column used by the skip-scan needs to be sufficiently selective.
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# See the private email from Adi Zaimi to drh@sqlite.org on 2014-09-22.
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#
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db close
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forcedelete test.db
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sqlite3 db test.db
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do_execsql_test skipscan1-6.1 {
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CREATE TABLE t1(a,b,c,d,e,f,g,h varchar(300));
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CREATE INDEX t1ab ON t1(a,b);
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ANALYZE sqlite_master;
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-- Only two distinct values for the skip-scan column. Skip-scan is not used.
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INSERT INTO sqlite_stat1 VALUES('t1','t1ab','500000 250000 125000');
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
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} {~/ANY/}
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do_execsql_test skipscan1-6.2 {
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-- Four distinct values for the skip-scan column. Skip-scan is used.
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UPDATE sqlite_stat1 SET stat='500000 250000 62500';
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
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} {/ANY.a. AND b=/}
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do_execsql_test skipscan1-6.3 {
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-- Two distinct values for the skip-scan column again. Skip-scan is not used.
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UPDATE sqlite_stat1 SET stat='500000 125000 62500';
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
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} {~/ANY/}
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# If the sqlite_stat1 entry includes the "noskipscan" token, then never use
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# skipscan with that index.
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#
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do_execsql_test skipscan1-7.1 {
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UPDATE sqlite_stat1 SET stat='500000 125000 1 sz=100';
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
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} {/ANY/}
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do_execsql_test skipscan1-7.2 {
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UPDATE sqlite_stat1 SET stat='500000 125000 1 noskipscan sz=100';
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
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} {~/ANY/}
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do_execsql_test skipscan1-7.3 {
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UPDATE sqlite_stat1 SET stat='500000 125000 1 sz=100 noskipscan';
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN SELECT * FROM t1 WHERE b=1;
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} {~/ANY/}
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# Ticket 8fd39115d8f46ece70e7d4b3c481d1bd86194746 2015-07-23
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# Incorrect code generated for a skipscan within an OR optimization
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# on a WITHOUT ROWID table.
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#
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do_execsql_test skipscan1-8.1 {
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DROP TABLE IF EXISTS t1;
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CREATE TABLE t1(x, y, PRIMARY KEY(x,y)) WITHOUT ROWID;
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INSERT INTO t1(x,y) VALUES(1,'AB');
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INSERT INTO t1(x,y) VALUES(2,'CD');
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ANALYZE;
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DROP TABLE IF EXISTS sqlite_stat4;
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DELETE FROM sqlite_stat1;
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INSERT INTO sqlite_stat1(tbl,idx,stat) VALUES('t1','t1','1000000 100 1');
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ANALYZE sqlite_master;
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SELECT * FROM t1
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WHERE (y = 'AB' AND x <= 4)
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OR (y = 'EF' AND x = 5);
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} {1 AB}
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do_execsql_test skipscan1-8.1eqp {
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EXPLAIN QUERY PLAN
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SELECT * FROM t1
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WHERE (y = 'AB' AND x <= 4)
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OR (y = 'EF' AND x = 5);
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} {/ANY/}
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do_execsql_test skipscan1-8.2 {
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SELECT * FROM t1
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WHERE y = 'AB' OR (y = 'CD' AND x = 2)
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ORDER BY +x;
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} {1 AB 2 CD}
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# Segfault reported on the mailing list by Keith Medcalf on 2016-09-18.
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# A skip-scan with a "column IN (SELECT ...)" on the second term of the
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# index.
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#
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do_execsql_test skipscan1-9.2 {
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CREATE TABLE t9a(a,b,c);
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CREATE INDEX t9a_ab ON t9a(a,b);
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CREATE TABLE t9b(x,y);
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ANALYZE sqlite_master;
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INSERT INTO sqlite_stat1 VALUES('t9a','t9a_ab','1000000 250000 1');
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ANALYZE sqlite_master;
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EXPLAIN QUERY PLAN
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SELECT * FROM t9a WHERE b IN (SELECT x FROM t9b WHERE y!=5);
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} {/USING INDEX t9a_ab .ANY.a. AND b=./}
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optimization_control db skip-scan off
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do_execsql_test skipscan1-9.3 {
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EXPLAIN QUERY PLAN
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SELECT * FROM t9a WHERE b IN (SELECT x FROM t9b WHERE y!=5);
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} {/{SCAN t9a}/}
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optimization_control db all on
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do_execsql_test skipscan1-2.1 {
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CREATE TABLE t6(a TEXT, b INT, c INT, d INT);
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CREATE INDEX t6abc ON t6(a,b,c);
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INSERT INTO t6 VALUES('abc',123,4,5);
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ANALYZE;
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DELETE FROM sqlite_stat1;
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INSERT INTO sqlite_stat1 VALUES('t6','t6abc','10000 5000 2000 10');
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ANALYZE sqlite_master;
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DELETE FROM t6;
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} {}
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do_execsql_test skipscan1-2.2eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t6 WHERE d<>99 AND b=345 ORDER BY a;
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} {/* USING INDEX t6abc (ANY(a) AND b=?)*/}
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do_execsql_test skipscan1-2.2 {
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SELECT a,b,c,d,'|' FROM t6 WHERE d<>99 AND b=345 ORDER BY a;
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} {}
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do_execsql_test skipscan1-2.3eqp {
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EXPLAIN QUERY PLAN
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SELECT a,b,c,d,'|' FROM t6 WHERE d<>99 AND b=345 ORDER BY a DESC;
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} {/* USING INDEX t6abc (ANY(a) AND b=?)*/}
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do_execsql_test skipscan1-2.3 {
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SELECT a,b,c,d,'|' FROM t6 WHERE d<>99 AND b=345 ORDER BY a DESC;
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} {}
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# 2019-07-29 Ticket ced41c7c7d6b4d36
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# A skipscan query is not order-distinct
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#
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db close
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sqlite3 db :memory:
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do_execsql_test skipscan1-3.1 {
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CREATE TABLE t1 (c1, c2, c3, c4, PRIMARY KEY(c4, c3));
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INSERT INTO t1 VALUES(3,0,1,NULL);
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INSERT INTO t1 VALUES(0,4,1,NULL);
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INSERT INTO t1 VALUES(5,6,1,NULL);
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INSERT INTO t1 VALUES(0,4,1,NULL);
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ANALYZE sqlite_master;
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INSERT INTO sqlite_stat1 VALUES('t1','sqlite_autoindex_t1_1','18 18 6');
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ANALYZE sqlite_master;
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SELECT DISTINCT quote(c1), quote(c2), quote(c3), quote(c4), '|'
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FROM t1 WHERE t1.c3 = 1;
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} {3 0 1 NULL | 0 4 1 NULL | 5 6 1 NULL |}
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do_eqp_test skipscan1-3.2 {
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SELECT DISTINCT quote(c1), quote(c2), quote(c3), quote(c4), '|'
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FROM t1 WHERE t1.c3 = 1;
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} {
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QUERY PLAN
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|--SEARCH t1 USING INDEX sqlite_autoindex_t1_1 (ANY(c4) AND c3=?)
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`--USE TEMP B-TREE FOR DISTINCT
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}
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# 2020-01-06 ticket 304017f5f04a0035
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#
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reset_db
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do_execsql_test skipscan1-4.10 {
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CREATE TABLE t1(a,b INT);
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INSERT INTO t1(a,b) VALUES(1,2),(3,3),(4,5);
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CREATE UNIQUE INDEX i1 ON t1(b,b,a,a,a,a,a,b,a);
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ANALYZE;
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DROP TABLE IF EXISTS sqlite_stat4;
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INSERT INTO sqlite_stat1 VALUES('t1','i1','30 30 30 2 2 2 2 2 2 2');
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ANALYZE sqlite_master;
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SELECT DISTINCT a
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FROM t1
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WHERE a = b
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AND a = 3
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AND b IN (1,3,2,4)
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AND b >= 0
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AND a <= 10;
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} {3}
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# 2023-03-24 https://sqlite.org/forum/forumpost/8cc1dc0fe9
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#
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reset_db
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do_execsql_test skipscan1-5.0 {
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CREATE TABLE t1(a TEXT, UNIQUE(a,a,a));
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INSERT INTO t1 VALUES (hex(zeroblob(241))),(1),(2),(3);
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ANALYZE;
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SELECT max(a) FROM t1 WHERE a IN t1;
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} {3}
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finish_test
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