carry to fix TableMetaData load error when use oracle. (#5436) (#5787)

* carry to fix TableMetaData load error when use oracle. (#5436)

* fix TableMetaData load error when use oracle.

* optimize code style.

* check index name
Co-authored-by: NTaoZhi <UIT_TAOZHI@163.com>

shardingsphere-sql-parser/shardingsphere-sql-parser-binder/src/main/java/org/apache/shardingsphere/sql/parser/binder/metadata/column/ColumnMetaDataLoader.java

@@ -101,7 +101,7 @@ public final class ColumnMetaDataLoader {
             delimiterLeft = "";
             delimiterRight = "";
         }
-        return "SELECT * FROM " + delimiterLeft + table + delimiterRight + " WHERE 1 != 1;";
+        return "SELECT * FROM " + delimiterLeft + table + delimiterRight + " WHERE 1 != 1";
     }
     
     private static boolean isTableExist(final Connection connection, final String catalog, final String table) throws SQLException {

shardingsphere-sql-parser/shardingsphere-sql-parser-binder/src/main/java/org/apache/shardingsphere/sql/parser/binder/metadata/index/IndexMetaDataLoader.java

@@ -48,7 +48,9 @@ public final class IndexMetaDataLoader {
         try (ResultSet resultSet = connection.getMetaData().getIndexInfo(connection.getCatalog(), JdbcUtil.getSchema(connection), table, false, false)) {
             while (resultSet.next()) {
                 String indexName = resultSet.getString(INDEX_NAME);
-                result.add(new IndexMetaData(indexName));
+                if (null != indexName) {
+                    result.add(new IndexMetaData(indexName));
+                }
             }
         }
         return result;