/**
  * Checks that the first column returned by a query has the expected type. For example,
  *
  * <blockquote>
  *
  * <code>checkQueryType("SELECT empno FROM Emp", "INTEGER NOT
  * NULL");</code>
  *
  * </blockquote>
  *
  * @param sql Query
  * @param expected Expected type, including nullability
  */
 public final void checkIntervalConv(String sql, String expected) {
   tester.checkIntervalConv(SqlTesterImpl.buildQuery(sql), expected);
 }
 /** Checks that a SQL expression gives a particular error. */
 public final void checkExpFails(String sql, String expected) {
   tester.assertExceptionIsThrown(SqlTesterImpl.buildQuery(sql), expected);
 }
 public final void checkExpType(String sql, String expected) {
   checkColumnType(SqlTesterImpl.buildQuery(sql), expected);
 }
 public void checkExp(String sql) {
   tester.assertExceptionIsThrown(SqlTesterImpl.buildQuery(sql), null);
 }