Github user fhueske commented on a diff in the pull request:
https://github.com/apache/flink/pull/5441#discussion_r167947410
--- Diff:
flink-libraries/flink-sql-client/src/main/java/org/apache/flink/table/client/gateway/DynamicResult.java
---
@@ -0,0 +1,253 @@
+/*
+ * Licensed to the Apache Software Foundation (ASF) under one
+ * or more contributor license agreements. See the NOTICE file
+ * distributed with this work for additional information
+ * regarding copyright ownership. The ASF licenses this file
+ * to you under the Apache License, Version 2.0 (the
+ * "License"); you may not use this file except in compliance
+ * with the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.apache.flink.table.client.gateway;
+
+import org.apache.flink.api.java.tuple.Tuple2;
+import org.apache.flink.table.sinks.TableSink;
+import org.apache.flink.types.Row;
+
+import java.net.InetAddress;
+import java.util.ArrayList;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+/**
+ * A result of a dynamic table program.
+ */
+public class DynamicResult {
+
+ private final boolean isChangelog;
+ private final CollectTableSink collectTableSink;
+ private final Object resultLock = new Object();
+ private final ResultRetrievalThread retrievalThread;
+ private final JobMonitoringThread monitoringThread;
+ private Runnable program;
+ private SqlExecutionException executionException;
+
+ // for table materialization
+ private final List<Row> materializedTable;
+ private final Map<Row, List<Integer>> rowPositions; // positions of
rows in table for faster access
+ private final List<Row> snapshot;
+ private int pageSize;
+ private boolean isLastSnapshot;
+
+ // for changelog
+ private Tuple2<Boolean, Row> nextChangeRecord;
--- End diff --
Also fetch change rows in a List for more efficient retrieval?
---
