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dd545d3bf2
loop can only have a single iteration and is hence not really a loop. FossilOrigin-Name: 13e3bd3de6b434b6182ef36be108d7ee0be8ca53
105 lines
3.5 KiB
Plaintext
105 lines
3.5 KiB
Plaintext
# 2016-05-20
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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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# This file implements regression tests for SQLite library. The
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# focus of this file is testing the LIMIT in combination with ORDER BY
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# and in particular, the optimizations in the inner loop that cause an
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# early exit of the inner loop when the LIMIT is reached and the inner
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# loop is emitting rows in ORDER BY order.
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set testdir [file dirname $argv0]
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source $testdir/tester.tcl
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do_execsql_test limit2-100 {
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CREATE TABLE t1(a,b);
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WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
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INSERT INTO t1(a,b) SELECT 1, (x*17)%1000 + 1000 FROM c;
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INSERT INTO t1(a,b) VALUES(2,2),(3,1006),(4,4),(5,9999);
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CREATE INDEX t1ab ON t1(a,b);
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}
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set sqlite_search_count 0
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do_execsql_test limit2-100.1 {
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SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b LIMIT 5;
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} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
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set fast_count $sqlite_search_count
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set sqlite_search_count 0
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do_execsql_test limit2-100.2 {
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SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b LIMIT 5;
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} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
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do_test limit2-100.3 {
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set slow_count $sqlite_search_count
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expr {$fast_count < 0.02*$slow_count}
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} {1}
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do_execsql_test limit2-110 {
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CREATE TABLE t2(x,y);
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INSERT INTO t2(x,y) VALUES('a',1),('a',2),('a',3),('a',4);
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INSERT INTO t2(x,y) VALUES('b',1),('c',2),('d',3),('e',4);
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CREATE INDEX t2xy ON t2(x,y);
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}
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set sqlite_search_count 0
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do_execsql_test limit2-110.1 {
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SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY t1.b LIMIT 5;
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} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
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set fast_count $sqlite_search_count
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set sqlite_search_count 0
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do_execsql_test limit2-110.2 {
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SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY +t1.b LIMIT 5;
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} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
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set slow_count $sqlite_search_count
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do_test limit2-110.3 {
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expr {$fast_count < 0.02*$slow_count}
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} {1}
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do_execsql_test limit2-120 {
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DROP INDEX t1ab;
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CREATE INDEX t1ab ON t1(a,b DESC);
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}
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set sqlite_search_count 0
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do_execsql_test limit2-120.1 {
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SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b DESC LIMIT 5;
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} {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |}
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set fast_count $sqlite_search_count
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set sqlite_search_count 0
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do_execsql_test limit2-120.2 {
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SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b DESC LIMIT 5;
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} {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |}
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do_test limit2-120.3 {
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set slow_count $sqlite_search_count
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expr {$fast_count < 0.02*$slow_count}
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} {1}
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# Bug report against the new ORDER BY LIMIT optimization just prior to
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# release. (Unreleased so there is no ticket).
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#
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# Make sure the optimization is not applied if the inner loop can only
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# provide a single row of output.
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#
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do_execsql_test limit2-200 {
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CREATE TABLE t200(a, b);
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WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
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INSERT INTO t200(a,b) SELECT x, x FROM c;
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CREATE TABLE t201(x INTEGER PRIMARY KEY, y);
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INSERT INTO t201(x,y) VALUES(2,12345);
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SELECT *, '|' FROM t200, t201 WHERE x=b ORDER BY y LIMIT 3;
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} {2 2 2 12345 |}
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do_execsql_test limit2-210 {
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SELECT *, '|' FROM t200 LEFT JOIN t201 ON x=b ORDER BY y LIMIT 3;
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} {1 1 {} {} | 3 3 {} {} | 4 4 {} {} |}
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finish_test
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