Impala invalidate metadata through jdbc

Question

Is there any way to invalidate metadata on Impala through jdbc?

I've tried the following (I am using Cloudera_ImpalaJDBC4_2.5.5.1007 driver):

            // invalidate metadata and rebuild index on Impala 
            try {
                Statement stmt = impalaConn.createStatement();
                try {
                    String query = "INVALIDATE METADATA;";
                    ResultSet resultSet = stmt.executeQuery(query);
                    while (resultSet.next()) {
                        // do something
                    }
                }                
                finally {
                    stmt.close();
                }
            }
            catch(SQLException ex) {
                while (ex != null)
                {
                    ex.printStackTrace();
                    ex = ex.getNextException();
                }
                System.exit(1);
            }

but I got the following exception:

java.sql.SQLDataException: [Simba][JDBC](11300) A ResultSet was expected but not generated from query "INVALIDATE METADATA;". Query not executed.
        at com.cloudera.impala.exceptions.ExceptionConverter.toSQLException(ExceptionConverter.java:136)
        at com.cloudera.impala.jdbc.common.SStatement.checkCondition(SStatement.java:2274)
        at com.cloudera.impala.jdbc.common.SStatement.executeNoParams(SStatement.java:2704)
        at com.cloudera.impala.jdbc.common.SStatement.executeQuery(SStatement.java:880)
        at ico.az.deploy.TestSuite.testTeradata(TestSuite.java:103)
        at ico.az.deploy.TestSuite.run(TestSuite.java:310)
        at ico.az.deploy.TestSuite.main(TestSuite.java:345)

Any idea?

Answer 1

Yes. That query doesn't return a ResultSet. Use Statement.executeUpdate(String) instead. As the JavaDoc notes, bold added for emphasis, Executes the given SQL statement, which may be an INSERT, UPDATE, or DELETE statement or an SQL statement that returns nothing.

stmt.executeUpdate(query);