[sql] Import SQLite 3.17.0.

third_party/sqlite/src/test/limit2.test

Index: third_party/sqlite/src/test/limit2.test
diff --git a/third_party/sqlite/src/test/limit2.test b/third_party/sqlite/src/test/limit2.test
new file mode 100644
index 0000000000000000000000000000000000000000..f6eaefb8aa4bc7927d1f0b6f7dc38406c66b3a6e
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+++ b/third_party/sqlite/src/test/limit2.test
@@ -0,0 +1,153 @@
+# 2016-05-20
+#
+# 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.
+#
+#***********************************************************************
+# This file implements regression tests for SQLite library.  The
+# focus of this file is testing the LIMIT in combination with ORDER BY
+# and in particular, the optimizations in the inner loop that cause an
+# early exit of the inner loop when the LIMIT is reached and the inner
+# loop is emitting rows in ORDER BY order.
+
+
+set testdir [file dirname $argv0]
+source $testdir/tester.tcl
+set testprefix limit2
+
+do_execsql_test limit2-100 {
+  CREATE TABLE t1(a,b);
+  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
+    INSERT INTO t1(a,b) SELECT 1, (x*17)%1000 + 1000 FROM c;
+  INSERT INTO t1(a,b) VALUES(2,2),(3,1006),(4,4),(5,9999);
+  CREATE INDEX t1ab ON t1(a,b);
+}
+set sqlite_search_count 0
+do_execsql_test limit2-100.1 {
+  SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b LIMIT 5;
+} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
+set fast_count $sqlite_search_count
+set sqlite_search_count 0
+do_execsql_test limit2-100.2 {
+  SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b LIMIT 5;
+} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
+do_test limit2-100.3 {
+  set slow_count $sqlite_search_count
+  expr {$fast_count < 0.02*$slow_count}
+} {1}
+
+do_execsql_test limit2-110 {
+  CREATE TABLE t2(x,y);
+  INSERT INTO t2(x,y) VALUES('a',1),('a',2),('a',3),('a',4);
+  INSERT INTO t2(x,y) VALUES('b',1),('c',2),('d',3),('e',4);
+  CREATE INDEX t2xy ON t2(x,y);
+}
+set sqlite_search_count 0
+do_execsql_test limit2-110.1 {
+  SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY t1.b LIMIT 5;
+} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
+set fast_count $sqlite_search_count
+set sqlite_search_count 0
+do_execsql_test limit2-110.2 {
+  SELECT a, b, '|' FROM t2, t1 WHERE t2.x='a' AND t1.a=t2.y ORDER BY +t1.b LIMIT 5;
+} {2 2 | 4 4 | 1 1000 | 1 1001 | 1 1002 |}
+set slow_count $sqlite_search_count
+do_test limit2-110.3 {
+  expr {$fast_count < 0.02*$slow_count}
+} {1}
+
+do_execsql_test limit2-120 {
+  DROP INDEX t1ab;
+  CREATE INDEX t1ab ON t1(a,b DESC);
+}
+set sqlite_search_count 0
+do_execsql_test limit2-120.1 {
+  SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY b DESC LIMIT 5;
+} {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |}
+set fast_count $sqlite_search_count
+set sqlite_search_count 0
+do_execsql_test limit2-120.2 {
+  SELECT a, b, '|' FROM t1 WHERE a IN (2,4,5,3,1) ORDER BY +b DESC LIMIT 5;
+} {5 9999 | 1 1999 | 1 1998 | 1 1997 | 1 1996 |}
+do_test limit2-120.3 {
+  set slow_count $sqlite_search_count
+  expr {$fast_count < 0.02*$slow_count}
+} {1}
+
+# Bug report against the new ORDER BY LIMIT optimization just prior to
+# release.  (Unreleased so there is no ticket).
+#
+# Make sure the optimization is not applied if the inner loop can only
+# provide a single row of output.
+#
+do_execsql_test limit2-200 {
+  CREATE TABLE t200(a, b);
+  WITH RECURSIVE c(x) AS (VALUES(1) UNION ALL SELECT x+1 FROM c WHERE x<1000)
+    INSERT INTO t200(a,b) SELECT x, x FROM c;
+  CREATE TABLE t201(x INTEGER PRIMARY KEY, y);
+  INSERT INTO t201(x,y) VALUES(2,12345);
+
+  SELECT *, '|' FROM t200, t201 WHERE x=b ORDER BY y LIMIT 3;
+} {2 2 2 12345 |}
+do_execsql_test limit2-210 {
+  SELECT *, '|' FROM t200 LEFT JOIN t201 ON x=b ORDER BY y LIMIT 3;
+} {1 1 {} {} | 3 3 {} {} | 4 4 {} {} |}
+
+# Bug in the ORDER BY LIMIT optimization reported on 2016-09-06.
+# Ticket https://www.sqlite.org/src/info/559733b09e96
+#
+do_execsql_test limit2-300 {
+  CREATE TABLE t300(a,b,c);
+  CREATE INDEX t300x ON t300(a,b,c);
+  INSERT INTO t300 VALUES(0,1,99),(0,1,0),(0,0,0);
+  SELECT *,'.' FROM t300 WHERE a=0 AND (c=0 OR c=99) ORDER BY c DESC;
+} {0 1 99 . 0 0 0 . 0 1 0 .}
+do_execsql_test limit2-310 {
+  SELECT *,'.' FROM t300 WHERE a=0 AND (c=0 OR c=99) ORDER BY c DESC LIMIT 1;
+} {0 1 99 .}
+
+# Make sure the SELECT loop is ordered correctly for the direction of
+# the ORDER BY
+#
+do_execsql_test limit2-400 {
+  CREATE TABLE t400(a,b);
+  CREATE INDEX t400_ab ON t400(a,b);
+  INSERT INTO t400(a,b) VALUES(1,90),(1,40),(2,80),(2,30),(3,70),(3,20);
+  SELECT *,'x' FROM t400 WHERE a IN (1,2,3) ORDER BY b DESC LIMIT 3;
+  SELECT *,'y' FROM t400 WHERE a IN (1,2,3) ORDER BY +b DESC LIMIT 3;
+} {1 90 x 2 80 x 3 70 x 1 90 y 2 80 y 3 70 y}
+
+
+do_execsql_test 500 {
+  CREATE TABLE t500(i INTEGER PRIMARY KEY, j);
+  INSERT INTO t500 VALUES(1, 1);
+  INSERT INTO t500 VALUES(2, 2);
+  INSERT INTO t500 VALUES(3, 3);
+  INSERT INTO t500 VALUES(4, 0);
+  INSERT INTO t500 VALUES(5, 5);
+  SELECT j FROM t500 WHERE i IN (1,2,3,4,5) ORDER BY j DESC LIMIT 3;
+} {5 3 2}
+do_execsql_test 501 {
+  CREATE TABLE t501(i INTEGER PRIMARY KEY, j);
+  INSERT INTO t501 VALUES(1, 5);
+  INSERT INTO t501 VALUES(2, 4);
+  INSERT INTO t501 VALUES(3, 3);
+  INSERT INTO t501 VALUES(4, 6);
+  INSERT INTO t501 VALUES(5, 1);
+  SELECT j FROM t501 WHERE i IN (1,2,3,4,5) ORDER BY j LIMIT 3;
+} {1 3 4}
+do_execsql_test 502 {
+  CREATE TABLE t502(i INT PRIMARY KEY, j);
+  INSERT INTO t502 VALUES(1, 5);
+  INSERT INTO t502 VALUES(2, 4);
+  INSERT INTO t502 VALUES(3, 3);
+  INSERT INTO t502 VALUES(4, 6);
+  INSERT INTO t502 VALUES(5, 1);
+  SELECT j FROM t502 WHERE i IN (1,2,3,4,5) ORDER BY j LIMIT 3;
+} {1 3 4}
+
+finish_test