style: import the structured relation type in statement tests

Signed-off-by: minleejae <mmj9808@gmail.com>

Author: minleejae

src/test/java/net/sf/jsqlparser/statement/UnsupportedStatementTest.java

@@ -17,6 +17,7 @@
 
 import net.sf.jsqlparser.JSQLParserException;
 import net.sf.jsqlparser.parser.CCJSqlParserUtil;
+import net.sf.jsqlparser.statement.alter.AlterRelation;
 import net.sf.jsqlparser.statement.create.trigger.CreateTrigger;
 import net.sf.jsqlparser.statement.select.Select;
 import net.sf.jsqlparser.test.TestUtils;
@@ -122,7 +123,7 @@ void testFormerlyUnsupportedAlterIndex() throws JSQLParserException {
         String sqlStr =
                 "ALTER INDEX idx_t_fa RENAME TO idx_t_fb";
         Statement statement = TestUtils.assertSqlCanBeParsedAndDeparsed(sqlStr, true);
-        assertInstanceOf(net.sf.jsqlparser.statement.alter.AlterRelation.class, statement);
+        assertInstanceOf(AlterRelation.class, statement);
     }
 
     @Test