[ADQL] Fix a NullPointerException in SearchColumnOutsiteGroupByHandler.gotInto.

See the test case TestDBChecker.testClauseADQLWithNameNull() for more details.

src/adql/db/DBChecker.java

@@ -1306,13 +1306,13 @@ public class DBChecker implements QueryChecker {
 	 * </p>
 	 * 
 	 * @author Gr&eacute;gory Mantelet (ARI)
-	 * @version 1.4 (04/2017)
+	 * @version 1.4 (05/2017)
 	 * @since 1.4
 	 */
 	private static class SearchColumnOutsideGroupByHandler extends SearchColumnHandler {
 		@Override
 		protected boolean goInto(final ADQLObject obj){
-			return !(obj instanceof ClauseADQL<?> && ((ClauseADQL<?>)obj).getName().equalsIgnoreCase("GROUP BY")) && super.goInto(obj);
+			return !(obj instanceof ClauseADQL<?> && ((ClauseADQL<?>)obj).getName() != null && ((ClauseADQL<?>)obj).getName().equalsIgnoreCase("GROUP BY")) && super.goInto(obj);
 		}
 	}
 

test/adql/db/TestDBChecker.java

@@ -96,6 +96,23 @@ public class TestDBChecker {
 			assertEquals(expected[i], names[i]);
 	}
 
+	@Test
+	public void testClauseADQLWithNameNull(){
+		/* The name of an ADQLClause is got in DBChecker by SearchColumnOutsideGroupByHandler.goInto(...)
+		 * and possibly in other locations in the future. If this name is NULL, no NullPointerException
+		 * should be thrown.
+		 * 
+		 * This issue can be tested by creating a ConstraintsGroup (i.e. in a constraints location like WHERE or JOIN...ON,
+		 * a constraint (or more) between parenthesis). */
+		ADQLParser parser = new ADQLParser(new DBChecker(tables, new ArrayList<FunctionDef>(0)));
+		try{
+			parser.parseQuery("SELECT * FROM foo WHERE (colI BETWEEN 1 AND 10)");
+		}catch(ParseException pe){
+			pe.printStackTrace();
+			fail();
+		}
+	}
+
 	@Test
 	public void testGroupByWithQualifiedColName(){
 		ADQLParser parser = new ADQLParser(new DBChecker(tables, new ArrayList<FunctionDef>(0)));