Refactor CALL procedure "sys.xxx_cluster_config" to support multiple conifg keys

Signed-off-by: Pei Yu <[email protected]>

Author: sd4324530

fluss-flink/fluss-flink-common/src/main/java/org/apache/fluss/flink/procedure/GetClusterConfigsProcedure.java

@@ -109,6 +109,8 @@ private Row[] getConfigs(@Nullable String... configKeys) throws Exception {
                                         entry.source() != null
                                                 ? entry.source().name()
                                                 : "UNKNOWN"));
+                    } else {
+                        results.add(Row.of());
                     }
                 }
             }