/*
* Copyright 2004-2011 H2 Group. Multiple-Licensed under the H2 License,
* Version 1.0, and under the Eclipse Public License, Version 1.0
* (http://h2database.com/html/license.html).
* Initial Developer: H2 Group
*/
package org.h2.test.db;
import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.sql.Types;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.Random;
import java.util.TreeSet;
import org.h2.constant.ErrorCode;
import org.h2.test.TestBase;
import org.h2.tools.SimpleResultSet;
import org.h2.util.New;
import org.h2.util.Task;
/**
* Test various optimizations (query cache, optimization for MIN(..), and
* MAX(..)).
*/
public class TestOptimizations extends TestBase {
/**
* Run just this test.
*
* @param a ignored
*/
public static void main(String... a) throws Exception {
TestBase.createCaller().init().test();
}
public void test() throws Exception {
deleteDb("optimizations");
testLike();
testExistsSubquery();
testQueryCacheConcurrentUse();
testQueryCacheResetParams();
testRowId();
testSortIndex();
testAutoAnalyze();
testInAndBetween();
testNestedIn();
testNestedInSelectAndLike();
testNestedInSelect();
testInSelectJoin();
testMinMaxNullOptimization();
if (config.networked) {
return;
}
testOptimizeInJoinSelect();
testOptimizeInJoin();
testMultiColumnRangeQuery();
testDistinctOptimization();
testQueryCacheTimestamp();
testQueryCacheSpeed();
testQueryCache(true);
testQueryCache(false);
testIn();
testMinMaxCountOptimization(true);
testMinMaxCountOptimization(false);
deleteDb("optimizations");
}
private void testLike() throws Exception {
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create table test(name varchar primary key) as select x from system_range(1, 10)");
ResultSet rs = stat.executeQuery("explain select * from test where name like ? || '%' {1: 'Hello'}");
rs.next();
// ensure the ID = 10 part is evaluated first
assertContains(rs.getString(1), "PRIMARY_KEY_");
stat.execute("drop table test");
conn.close();
}
private void testExistsSubquery() throws Exception {
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create table test(id int) as select x from system_range(1, 10)");
ResultSet rs = stat.executeQuery("explain select * from test where exists(select 1 from test, test, test) and id = 10");
rs.next();
// ensure the ID = 10 part is evaluated first
assertContains(rs.getString(1), "WHERE (ID = 10)");
stat.execute("drop table test");
conn.close();
}
private void testQueryCacheConcurrentUse() throws Exception {
final Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create table test(id int primary key, data clob)");
stat.execute("insert into test values(0, space(10000))");
stat.execute("insert into test values(1, space(10001))");
Task[] tasks = new Task[2];
for (int i = 0; i < tasks.length; i++) {
tasks[i] = new Task() {
public void call() throws Exception {
PreparedStatement prep = conn.prepareStatement("select * from test where id = ?");
while (!stop) {
int x = (int) (Math.random() * 2);
prep.setInt(1, x);
ResultSet rs = prep.executeQuery();
rs.next();
String data = rs.getString(2);
if (data.length() != 10000 + x) {
throw new Exception(data.length() + " != " + x);
}
rs.close();
}
}
};
tasks[i].execute();
}
Thread.sleep(1000);
for (Task t : tasks) {
t.get();
}
stat.execute("drop table test");
conn.close();
}
private void testQueryCacheResetParams() throws SQLException {
Connection conn = getConnection("optimizations");
PreparedStatement prep;
prep = conn.prepareStatement("select ?");
prep.setString(1, "Hello");
prep.execute();
prep.close();
prep = conn.prepareStatement("select ?");
assertThrows(ErrorCode.PARAMETER_NOT_SET_1, prep).execute();
prep.close();
conn.close();
}
private void testRowId() throws SQLException {
if (config.memory) {
return;
}
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
ResultSet rs;
stat.execute("create table test(data varchar)");
stat.execute("select min(_rowid_ + 1) from test");
stat.execute("insert into test(_rowid_, data) values(10, 'Hello')");
stat.execute("insert into test(data) values('World')");
stat.execute("insert into test(_rowid_, data) values(20, 'Hello')");
stat.execute("merge into test(_rowid_, data) key(_rowid_) values(20, 'Hallo')");
rs = stat.executeQuery("select _rowid_, data from test order by _rowid_");
rs.next();
assertEquals(10, rs.getInt(1));
assertEquals("Hello", rs.getString(2));
rs.next();
assertEquals(11, rs.getInt(1));
assertEquals("World", rs.getString(2));
rs.next();
assertEquals(21, rs.getInt(1));
assertEquals("Hallo", rs.getString(2));
assertFalse(rs.next());
stat.execute("drop table test");
stat.execute("create table test(id int primary key, name varchar)");
stat.execute("insert into test values(0, 'Hello')");
stat.execute("insert into test values(3, 'Hello')");
stat.execute("insert into test values(2, 'Hello')");
rs = stat.executeQuery("explain select * from test where _rowid_ = 2");
rs.next();
assertContains(rs.getString(1), ".tableScan: _ROWID_ =");
rs = stat.executeQuery("explain select * from test where _rowid_ > 2");
rs.next();
assertContains(rs.getString(1), ".tableScan: _ROWID_ >");
rs = stat.executeQuery("explain select * from test order by _rowid_");
rs.next();
assertContains(rs.getString(1), "/* index sorted */");
rs = stat.executeQuery("select _rowid_, * from test order by _rowid_");
rs.next();
assertEquals(0, rs.getInt(1));
assertEquals(0, rs.getInt(2));
rs.next();
assertEquals(2, rs.getInt(1));
assertEquals(2, rs.getInt(2));
rs.next();
assertEquals(3, rs.getInt(1));
assertEquals(3, rs.getInt(2));
stat.execute("drop table test");
conn.close();
}
private void testSortIndex() throws SQLException {
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("drop table test if exists");
stat.execute("create table test(id int)");
stat.execute("create index idx_id_desc on test(id desc)");
stat.execute("create index idx_id_asc on test(id)");
ResultSet rs;
rs = stat.executeQuery("explain select * from test where id > 10 order by id");
rs.next();
assertTrue(rs.getString(1).indexOf("IDX_ID_ASC") >= 0);
rs = stat.executeQuery("explain select * from test where id < 10 order by id desc");
rs.next();
assertTrue(rs.getString(1).indexOf("IDX_ID_DESC") >= 0);
rs.next();
stat.execute("drop table test");
conn.close();
}
private void testAutoAnalyze() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
ResultSet rs = stat.executeQuery("select value from information_schema.settings where name='analyzeAuto'");
int auto = rs.next() ? rs.getInt(1) : 0;
if (auto != 0) {
stat.execute("create table test(id int)");
stat.execute("create user onlyInsert password ''");
stat.execute("grant insert on test to onlyInsert");
Connection conn2 = getConnection("optimizations", "onlyInsert", getPassword(""));
Statement stat2 = conn2.createStatement();
stat2.execute("insert into test select x from system_range(1, " + (auto + 10) + ")");
conn2.close();
}
conn.close();
}
private void testInAndBetween() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
ResultSet rs;
stat.execute("create table test(id int, name varchar)");
stat.execute("create index idx_name on test(id, name)");
stat.execute("insert into test values(1, 'Hello'), (2, 'World')");
rs = stat.executeQuery("select * from test where id between 1 and 3 and name in ('World')");
assertTrue(rs.next());
rs = stat.executeQuery("select * from test where id between 1 and 3 and name in (select 'World')");
assertTrue(rs.next());
stat.execute("drop table test");
conn.close();
}
private void testNestedIn() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
ResultSet rs;
stat.execute("create table accounts(id integer primary key, status varchar(255), tag varchar(255))");
stat.execute("insert into accounts values (31, 'X', 'A')");
stat.execute("create table parent(id int)");
stat.execute("insert into parent values(31)");
stat.execute("create view test_view as select a.status, a.tag from accounts a, parent t where a.id = t.id");
rs = stat.executeQuery("select * from test_view where status='X' and tag in ('A','B')");
assertTrue(rs.next());
rs = stat.executeQuery("select * from (select a.status, a.tag " +
"from accounts a, parent t where a.id = t.id) x where status='X' and tag in ('A','B')");
assertTrue(rs.next());
stat.execute("create table test(id int primary key, name varchar(255))");
stat.execute("create unique index idx_name on test(name, id)");
stat.execute("insert into test values(1, 'Hello'), (2, 'World')");
rs = stat.executeQuery("select * from (select * from test) where id=1 and name in('Hello', 'World')");
assertTrue(rs.next());
stat.execute("drop table test");
conn.close();
}
private void testNestedInSelect() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
ResultSet rs;
stat.execute("create table test(id int primary key, name varchar) as select 1, 'Hello'");
stat.execute("select * from (select * from test) where id=1 and name in('Hello', 'World')");
stat.execute("drop table test");
stat.execute("create table test(id int, name varchar) as select 1, 'Hello'");
stat.execute("create index idx2 on test(id, name)");
rs = stat.executeQuery("select count(*) from test where id=1 and name in('Hello', 'x')");
rs.next();
assertEquals(1, rs.getInt(1));
conn.close();
}
private void testNestedInSelectAndLike() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create table test(id int primary key)");
stat.execute("insert into test values(2)");
ResultSet rs = stat.executeQuery("select * from test where id in(1, 2)");
assertTrue(rs.next());
assertEquals(2, rs.getInt(1));
assertFalse(rs.next());
stat.execute("create table test2(id int primary key hash)");
stat.execute("insert into test2 values(2)");
rs = stat.executeQuery("select * from test where id in(1, 2)");
assertTrue(rs.next());
assertEquals(2, rs.getInt(1));
assertFalse(rs.next());
PreparedStatement prep;
prep = conn.prepareStatement("SELECT * FROM DUAL A WHERE A.X IN (SELECT B.X FROM DUAL B WHERE B.X LIKE ?)");
prep.setString(1, "1");
prep.execute();
prep = conn.prepareStatement("SELECT * FROM DUAL A WHERE A.X IN (SELECT B.X FROM DUAL B WHERE B.X IN (?, ?))");
prep.setInt(1, 1);
prep.setInt(2, 1);
prep.executeQuery();
conn.close();
}
private void testInSelectJoin() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create table test(a int, b int, c int, d int) " +
"as select 1, 1, 1, 1 from dual;");
ResultSet rs;
PreparedStatement prep;
prep = conn.prepareStatement("SELECT 2 FROM TEST A "
+ "INNER JOIN (SELECT DISTINCT B.C AS X FROM TEST B "
+ "WHERE B.D = ?2) V ON 1=1 WHERE (A = ?1) AND (B = V.X)");
prep.setInt(1, 1);
prep.setInt(2, 1);
rs = prep.executeQuery();
assertTrue(rs.next());
assertFalse(rs.next());
prep = conn.prepareStatement(
"select 2 from test a where a=? and b in(" +
"select b.c from test b where b.d=?)");
prep.setInt(1, 1);
prep.setInt(2, 1);
rs = prep.executeQuery();
assertTrue(rs.next());
assertFalse(rs.next());
conn.close();
}
private void testOptimizeInJoinSelect() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create table item(id int primary key)");
stat.execute("insert into item values(1)");
stat.execute("create alias opt for \"" +
getClass().getName() +
".optimizeInJoinSelect\"");
PreparedStatement prep = conn.prepareStatement(
"select * from item where id in (select x from opt())");
ResultSet rs = prep.executeQuery();
assertTrue(rs.next());
assertEquals(1, rs.getInt(1));
assertFalse(rs.next());
conn.close();
}
/**
* This method is called via reflection from the database.
*
* @return a result set
*/
public static ResultSet optimizeInJoinSelect() {
SimpleResultSet rs = new SimpleResultSet();
rs.addColumn("X", Types.INTEGER, 0, 0);
rs.addRow(1);
return rs;
}
private void testOptimizeInJoin() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create table test(id int primary key)");
stat.execute("insert into test select x from system_range(1, 1000)");
ResultSet rs = stat.executeQuery("explain select * from test where id in (400, 300)");
rs.next();
String plan = rs.getString(1);
if (plan.indexOf("/* PUBLIC.PRIMARY_KEY_") < 0) {
fail("Expected using the primary key, got: " + plan);
}
conn.close();
}
private void testMinMaxNullOptimization() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
Random random = new Random(1);
int len = getSize(50, 500);
for (int i = 0; i < len; i++) {
stat.execute("drop table if exists test");
stat.execute("create table test(x int)");
if (random.nextBoolean()) {
int count = random.nextBoolean() ? 1 : 1 + random.nextInt(len);
if (count > 0) {
stat.execute("insert into test select null from system_range(1, " + count + ")");
}
}
int maxExpected = -1;
int minExpected = -1;
if (random.nextInt(10) != 1) {
minExpected = 1;
maxExpected = 1 + random.nextInt(len);
stat.execute("insert into test select x from system_range(1, " + maxExpected + ")");
}
String sql = "create index idx on test(x";
if (random.nextBoolean()) {
sql += " desc";
}
if (random.nextBoolean()) {
if (random.nextBoolean()) {
sql += " nulls first";
} else {
sql += " nulls last";
}
}
sql += ")";
stat.execute(sql);
ResultSet rs = stat.executeQuery("explain select min(x), max(x) from test");
rs.next();
if (!config.mvcc) {
String plan = rs.getString(1);
assertTrue(plan.indexOf("direct") > 0);
}
rs = stat.executeQuery("select min(x), max(x) from test");
rs.next();
int min = rs.getInt(1);
if (rs.wasNull()) {
min = -1;
}
int max = rs.getInt(2);
if (rs.wasNull()) {
max = -1;
}
assertEquals(minExpected, min);
assertEquals(maxExpected, max);
}
conn.close();
}
private void testMultiColumnRangeQuery() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("CREATE TABLE Logs(id INT PRIMARY KEY, type INT)");
stat.execute("CREATE unique INDEX type_index ON Logs(type, id)");
stat.execute("INSERT INTO Logs SELECT X, MOD(X, 3) FROM SYSTEM_RANGE(1, 1000)");
stat.execute("ANALYZE SAMPLE_SIZE 0");
ResultSet rs;
rs = stat.executeQuery("EXPLAIN SELECT id FROM Logs WHERE id < 100 and type=2 AND id<100");
rs.next();
String plan = rs.getString(1);
assertTrue(plan.indexOf("TYPE_INDEX") > 0);
conn.close();
}
private void testDistinctOptimization() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("CREATE TABLE TEST(ID INT PRIMARY KEY, NAME VARCHAR, TYPE INT)");
stat.execute("CREATE INDEX IDX_TEST_TYPE ON TEST(TYPE)");
Random random = new Random(1);
int len = getSize(10000, 100000);
int[] groupCount = new int[10];
PreparedStatement prep = conn.prepareStatement("INSERT INTO TEST VALUES(?, ?, ?)");
for (int i = 0; i < len; i++) {
prep.setInt(1, i);
prep.setString(2, "Hello World");
int type = random.nextInt(10);
groupCount[type]++;
prep.setInt(3, type);
prep.execute();
}
ResultSet rs;
rs = stat.executeQuery("SELECT TYPE, COUNT(*) FROM TEST GROUP BY TYPE ORDER BY TYPE");
for (int i = 0; rs.next(); i++) {
assertEquals(i, rs.getInt(1));
assertEquals(groupCount[i], rs.getInt(2));
}
assertFalse(rs.next());
rs = stat.executeQuery("SELECT DISTINCT TYPE FROM TEST ORDER BY TYPE");
for (int i = 0; rs.next(); i++) {
assertEquals(i, rs.getInt(1));
}
assertFalse(rs.next());
stat.execute("ANALYZE");
rs = stat.executeQuery("SELECT DISTINCT TYPE FROM TEST ORDER BY TYPE");
for (int i = 0; i < 10; i++) {
assertTrue(rs.next());
assertEquals(i, rs.getInt(1));
}
assertFalse(rs.next());
rs = stat.executeQuery("SELECT DISTINCT TYPE FROM TEST ORDER BY TYPE LIMIT 5 OFFSET 2");
for (int i = 2; i < 7; i++) {
assertTrue(rs.next());
assertEquals(i, rs.getInt(1));
}
assertFalse(rs.next());
rs = stat.executeQuery("SELECT DISTINCT TYPE FROM TEST ORDER BY TYPE LIMIT -1 OFFSET 0 SAMPLE_SIZE 3");
// must have at least one row
assertTrue(rs.next());
for (int i = 0; i < 3; i++) {
rs.getInt(1);
if (i > 0 && !rs.next()) {
break;
}
}
assertFalse(rs.next());
conn.close();
}
private void testQueryCacheTimestamp() throws Exception {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
PreparedStatement prep = conn.prepareStatement("SELECT CURRENT_TIMESTAMP()");
ResultSet rs = prep.executeQuery();
rs.next();
String a = rs.getString(1);
Thread.sleep(50);
rs = prep.executeQuery();
rs.next();
String b = rs.getString(1);
assertFalse(a.equals(b));
conn.close();
}
private void testQueryCacheSpeed() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
testQuerySpeed(stat,
"select sum(a.n), sum(b.x) from system_range(1, 100) b, (select sum(x) n from system_range(1, 4000)) a");
conn.close();
}
private void testQuerySpeed(Statement stat, String sql) throws SQLException {
stat.execute("set OPTIMIZE_REUSE_RESULTS 0");
stat.execute(sql);
long time = System.currentTimeMillis();
stat.execute(sql);
time = System.currentTimeMillis() - time;
stat.execute("set OPTIMIZE_REUSE_RESULTS 1");
stat.execute(sql);
long time2 = System.currentTimeMillis();
stat.execute(sql);
time2 = System.currentTimeMillis() - time2;
if (time2 > time * 2) {
fail("not optimized: " + time + " optimized: " + time2 + " sql:" + sql);
}
}
private void testQueryCache(boolean optimize) throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
if (optimize) {
stat.execute("set OPTIMIZE_REUSE_RESULTS 1");
} else {
stat.execute("set OPTIMIZE_REUSE_RESULTS 0");
}
stat.execute("create table test(id int)");
stat.execute("create table test2(id int)");
stat.execute("insert into test values(1), (1), (2)");
stat.execute("insert into test2 values(1)");
PreparedStatement prep = conn.prepareStatement("select * from test where id = (select id from test2)");
ResultSet rs1 = prep.executeQuery();
rs1.next();
assertEquals(1, rs1.getInt(1));
rs1.next();
assertEquals(1, rs1.getInt(1));
assertFalse(rs1.next());
stat.execute("update test2 set id = 2");
ResultSet rs2 = prep.executeQuery();
rs2.next();
assertEquals(2, rs2.getInt(1));
conn.close();
}
private void testMinMaxCountOptimization(boolean memory) throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
stat.execute("create " + (memory ? "memory" : "") + " table test(id int primary key, value int)");
stat.execute("create index idx_value_id on test(value, id);");
int len = getSize(1000, 10000);
HashMap<Integer, Integer> map = New.hashMap();
TreeSet<Integer> set = new TreeSet<Integer>();
Random random = new Random(1);
for (int i = 0; i < len; i++) {
if (i == len / 2) {
if (!config.memory) {
conn.close();
conn = getConnection("optimizations");
stat = conn.createStatement();
}
}
switch (random.nextInt(10)) {
case 0:
case 1:
case 2:
case 3:
case 4:
case 5:
if (random.nextInt(1000) == 1) {
stat.execute("insert into test values(" + i + ", null)");
map.put(new Integer(i), null);
} else {
int value = random.nextInt();
stat.execute("insert into test values(" + i + ", " + value + ")");
map.put(i, value);
set.add(value);
}
break;
case 6:
case 7:
case 8: {
if (map.size() > 0) {
for (int j = random.nextInt(i), k = 0; k < 10; k++, j++) {
if (map.containsKey(j)) {
Integer x = map.remove(j);
if (x != null) {
set.remove(x);
}
stat.execute("delete from test where id=" + j);
}
}
}
break;
}
case 9: {
ArrayList<Integer> list = New.arrayList(map.values());
int count = list.size();
Integer min = null, max = null;
if (count > 0) {
min = set.first();
max = set.last();
}
ResultSet rs = stat.executeQuery("select min(value), max(value), count(*) from test");
rs.next();
Integer minDb = (Integer) rs.getObject(1);
Integer maxDb = (Integer) rs.getObject(2);
int countDb = rs.getInt(3);
assertEquals(minDb, min);
assertEquals(maxDb, max);
assertEquals(countDb, count);
break;
}
default:
}
}
conn.close();
}
private void testIn() throws SQLException {
deleteDb("optimizations");
Connection conn = getConnection("optimizations");
Statement stat = conn.createStatement();
PreparedStatement prep;
ResultSet rs;
assertFalse(stat.executeQuery("select * from dual where x in()").next());
assertFalse(stat.executeQuery("select * from dual where null in(1)").next());
assertFalse(stat.executeQuery("select * from dual where null in(null)").next());
assertFalse(stat.executeQuery("select * from dual where null in(null, 1)").next());
assertFalse(stat.executeQuery("select * from dual where 1+x in(3, 4)").next());
assertFalse(stat.executeQuery("select * from dual d1, dual d2 where d1.x in(3, 4)").next());
stat.execute("create table test(id int primary key, name varchar)");
stat.execute("insert into test values(1, 'Hello')");
stat.execute("insert into test values(2, 'World')");
prep = conn.prepareStatement("select * from test t1 where t1.id in(?)");
prep.setInt(1, 1);
rs = prep.executeQuery();
rs.next();
assertEquals(1, rs.getInt(1));
assertEquals("Hello", rs.getString(2));
assertFalse(rs.next());
prep = conn.prepareStatement("select * from test t1 where t1.id in(?, ?) order by id");
prep.setInt(1, 1);
prep.setInt(2, 2);
rs = prep.executeQuery();
rs.next();
assertEquals(1, rs.getInt(1));
assertEquals("Hello", rs.getString(2));
rs.next();
assertEquals(2, rs.getInt(1));
assertEquals("World", rs.getString(2));
assertFalse(rs.next());
prep = conn.prepareStatement("select * from test t1 where t1.id "
+ "in(select t2.id from test t2 where t2.id=?)");
prep.setInt(1, 2);
rs = prep.executeQuery();
rs.next();
assertEquals(2, rs.getInt(1));
assertEquals("World", rs.getString(2));
assertFalse(rs.next());
prep = conn.prepareStatement("select * from test t1 where t1.id "
+ "in(select t2.id from test t2 where t2.id=? and t1.id<>t2.id)");
prep.setInt(1, 2);
rs = prep.executeQuery();
assertFalse(rs.next());
prep = conn.prepareStatement("select * from test t1 where t1.id "
+ "in(select t2.id from test t2 where t2.id in(cast(?+10 as varchar)))");
prep.setInt(1, 2);
rs = prep.executeQuery();
assertFalse(rs.next());
conn.close();
}
}