Github user tonycox commented on a diff in the pull request:
https://github.com/apache/flink/pull/2968#discussion_r91941722
--- Diff: flink-core/src/main/java/org/apache/flink/types/Row.java ---
@@ -0,0 +1,110 @@
+/*
+ * 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.types;
+
+import org.apache.flink.annotation.PublicEvolving;
+import org.apache.flink.api.java.typeutils.RowTypeInfo;
+
+import java.io.Serializable;
+import java.util.Arrays;
+
+/**
+ * A Row has no limited length and contain a set of fields, which may all
be different types.
+ * Because Row is not strongly typed, Flink's type extraction mechanism
can't extract correct field
+ * types. So that users should manually tell Flink the type information
via creating a
+ * {@link RowTypeInfo}.
+ *
+ * <p>
+ * The fields in the Row may be accessed by position (zero-based) {@link
#getField(int)}. And can
+ * set fields by {@link #setField(int, Object)}.
+ * <p>
+ * Row is in principle serializable. However, it may contain
non-serializable fields,
+ * in which case serialization will fail.
+ *
+ */
+@PublicEvolving
+public class Row implements Serializable{
+
+ private static final long serialVersionUID = 1L;
+
+ /** The array to store actual values. */
+ private final Object[] fields;
+
+ /**
+ * Create a new Row instance.
+ * @param arity The number of field in the Row
+ */
+ public Row(int arity) {
+ this.fields = new Object[arity];
+ }
+
+ /**
+ * Get the number of field in the Row.
+ * @return The number of field in the Row.
+ */
+ public int getArity() {
+ return fields.length;
+ }
+
+ /**
+ * Gets the field at the specified position.
+ * @param pos The position of the field, 0-based.
+ * @return The field at the specified position.
+ * @throws IndexOutOfBoundsException Thrown, if the position is
negative, or equal to, or larger than the number of fields.
+ */
+ public Object getField(int pos) {
+ return fields[pos];
+ }
+
+ /**
+ * Sets the field at the specified position.
+ *
+ * @param pos The position of the field, 0-based.
+ * @param value The value to be assigned to the field at the specified
position.
+ * @throws IndexOutOfBoundsException Thrown, if the position is
negative, or equal to, or larger than the number of fields.
+ */
+ public void setField(int pos, Object value) {
+ fields[pos] = value;
+ }
+
+ @Override
+ public String toString() {
+ return Arrays.deepToString(fields);
--- End diff --
For example `org.apache.flink.api.scala.stream.table.AggregationsITCase` or
`org.apache.flink.api.scala.batch.table.JoinITCase`
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