Thks,Got that.
I have a mistake in understanding performance，
Sorry for my unprofessional, benchmark & profiler is best.
Qen Djeng <pcil...@gmail.com> 于2020年5月16日周六 下午11:04写道：
>
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> Why executeQuery execute so slow?, spend 11176ms on execute 1000s
> executeQuery!
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> Is there anything wrong in my code.
>
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>
> public class Main {
> public static class HrSchema {
> public final Employee[] emps = new Employee[] {
> new Employee()
> };
> }
> public static void main(String[] args) throws Exception {
>
> Class.*forName*("org.apache.calcite.jdbc.Driver");
> Properties info = new Properties();
> info.setProperty("lex", "JAVA");
> Connection connection =
> DriverManager.*getConnection*("jdbc:calcite:", info);
> CalciteConnection calciteConnection =
> connection.unwrap(CalciteConnection.class);
> SchemaPlus rootSchema = calciteConnection.getRootSchema();
> Schema schema = new ReflectiveSchema(new HrSchema());
> rootSchema.add("hr", schema);
> Statement statement = calciteConnection.createStatement();
>
> long start = System.*currentTimeMillis*();
> for(int i = 0; i < 1000; i++) {
> ResultSet resultSet = statement.executeQuery(
> "select * from hr.emps where name = 'name'");
> while (resultSet.next()) {
> }
> resultSet.close();
> }
> System.*out*.println(System.*currentTimeMillis*() - start);
> statement.close();
> connection.close();
> }
> }
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