[jira] [Created] (CALCITE-1801) RelRunners connection garbage-collected prematurely

["JD Zheng (JIRA)" <ji...@apache.org>]

JD Zheng created CALCITE-1801:
---------------------------------

             Summary: RelRunners connection garbage-collected prematurely
                 Key: CALCITE-1801
                 URL: https://issues.apache.org/jira/browse/CALCITE-1801
             Project: Calcite
          Issue Type: Bug
          Components: core
    Affects Versions: 1.13.0
         Environment: osx 10.11.6, JavaSE-1.8, junit-4.12
            Reporter: JD Zheng
            Assignee: Julian Hyde
            Priority: Minor


I am using RelRunners to execute pre-built relnode tree. It works perfectly when I put the following code in the junit class:

   protected String execute(RelNode rel) {
        try (final PreparedStatement preparedStatement = RelRunners.run(rel)) {
          final ResultSet resultSet = preparedStatement.executeQuery();
          return printResult(resultSet, true);
        } catch (SQLException e) {
          throw new RuntimeException(e);
        }
    }

However,if I put these code inside a src class, the returned resultSet is closed.

More interestingly, if I expand the RelRunners.run() in the method like this:

   public static ResultSet execute(RelNode rel) {
	/*
        try (final PreparedStatement preparedStatement = RelRunners.run(rel)) {
          return preparedStatement.executeQuery();
        } catch (SQLException e) {
          throw new AQLExecuteErrorException(e);
        }
        */
        try (Connection connection = DriverManager.getConnection("jdbc:calcite:")) {
            final RelRunner runner = connection.unwrap(RelRunner.class);
            PreparedStatement preparedStatement = runner.prepare(rel);
            return preparedStatement.executeQuery();
          } catch (SQLException e) {
            throw new AQLExecuteErrorException(e);
          }
    }

It works again. 



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