We have procedures that run in MySQL and that return multiple result sets. 
When build unit tests for them and using H2, I am unable to properly get a 
return from H2. If the procedure returns either an array of ResultSet or 
List<ResultSet>, both get wrapped in another array list instead of just 
returning the array/list of results.

The end result is that we can't use the return since it is different data 
returned back vs that from going straight to the MySQL database. Am I 
missing something here?

Example Procedure:

CREATE ALIAS getData AS $$
import java.sql.*;
import java.util.*;
import org.h2.tools.SimpleResultSet;
@CODE

List<ResultSet> getData(Connection conn, Integer clientId) {

  SimpleResultSet client = new SimpleResultSet();
  client.addColumn("id", Types.INTEGER, 10, 0);
  client.addColumn("name", Types.VARCHAR, 255, 0);
 
  SimpleResultSet conditions = new SimpleResultSet();
  conditions.addColumn("clientId", Types.INTEGER, 10, 0);
  conditions.addColumn("conditionId", Types.INTEGER, 10, 0);
  conditions.addColumn("conditionName", Types.VARCHAR, 255, 0);

  if (clientId > 0) {
    spaces.addRow(100, "test-client");
    conditions.addRow(100, 999, "test_condition");
  }

  return Arrays.asList(client, conditions);
}
$$;

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