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https://issues.apache.org/jira/browse/CALCITE-6613?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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suibianwanwan reassigned CALCITE-6613:
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Assignee: suibianwanwan
> Make the Background code examples in Calcite official documentation clearer
> ---------------------------------------------------------------------------
>
> Key: CALCITE-6613
> URL: https://issues.apache.org/jira/browse/CALCITE-6613
> Project: Calcite
> Issue Type: Improvement
> Reporter: Caican Cai
> Assignee: suibianwanwan
> Priority: Minor
>
> {code:java}
> public static class HrSchema {
> public final Employee[] emps = 0;
> public final Department[] depts = 0;
> }
> 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();
> ResultSet resultSet = statement.executeQuery(
> "select d.deptno, min(e.empid)\n"
> + "from hr.emps as e\n"
> + "join hr.depts as d\n"
> + " on e.deptno = d.deptno\n"
> + "group by d.deptno\n"
> + "having count(*) > 1");
> print(resultSet);
> resultSet.close();
> statement.close();
> connection.close();
> {code}
> Currently, the data of emps and depts are both 0, and it is not reasonable to
> not create a new object. We can create new Employee[0] and add some data,
> which may be more reasonable.
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