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https://issues.apache.org/jira/browse/FLINK-5187?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15732685#comment-15732685
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ASF GitHub Bot commented on FLINK-5187:
---------------------------------------
Github user tonycox commented on a diff in the pull request:
https://github.com/apache/flink/pull/2968#discussion_r91550465
--- Diff: flink-core/src/main/java/org/apache/flink/types/Row.java ---
@@ -0,0 +1,118 @@
+/*
+ * 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;
+
+ /** Number of field. */
+ private final int arity;
--- End diff --
`fields.length` is similar to `arity`
> Create analog of Row in core
> ----------------------------
>
> Key: FLINK-5187
> URL: https://issues.apache.org/jira/browse/FLINK-5187
> Project: Flink
> Issue Type: Sub-task
> Components: Core, Table API & SQL
> Reporter: Anton Solovev
> Assignee: Jark Wu
>
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