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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9964) Add a CSV table format factory
Date Mon, 13 Aug 2018 14:57:02 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16578392#comment-16578392

ASF GitHub Bot commented on FLINK-9964:

twalthr commented on a change in pull request #6541: [FLINK-9964] [table] Add a CSV table
format factory
URL: https://github.com/apache/flink/pull/6541#discussion_r209616703

 File path: flink-formats/flink-csv/src/main/java/org/apache/flink/formats/csv/CsvRowSchemaConverter.java
 @@ -0,0 +1,104 @@
+ * 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.formats.csv;
+import org.apache.flink.api.common.typeinfo.BasicArrayTypeInfo;
+import org.apache.flink.api.common.typeinfo.PrimitiveArrayTypeInfo;
+import org.apache.flink.api.common.typeinfo.TypeInformation;
+import org.apache.flink.api.common.typeinfo.Types;
+import org.apache.flink.api.java.typeutils.ObjectArrayTypeInfo;
+import org.apache.flink.api.java.typeutils.RowTypeInfo;
+import com.fasterxml.jackson.dataformat.csv.CsvSchema;
+import com.fasterxml.jackson.dataformat.csv.CsvSchema.Builder;
+import com.fasterxml.jackson.dataformat.csv.CsvSchema.Column;
+import java.util.Arrays;
+import java.util.Collections;
+import java.util.List;
+ * Converting functions that related to {@link CsvSchema}.
+ * In {@link CsvSchema}, there are four types(string,number,boolean
+ * and array), in order to satisfy various flink types, this class
+ * sorts out instances of {@link TypeInformation} and convert them to
+ * one of CsvSchema's types.
 Review comment:
   We should also document internals of Jackson. In particular when trimmed (leading/trailing
white space) and the special meaning of literals "null", "true" and "false".

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> Add a CSV table format factory
> ------------------------------
>                 Key: FLINK-9964
>                 URL: https://issues.apache.org/jira/browse/FLINK-9964
>             Project: Flink
>          Issue Type: Sub-task
>          Components: Table API &amp; SQL
>            Reporter: Timo Walther
>            Assignee: buptljy
>            Priority: Major
>              Labels: pull-request-available
> We should add a RFC 4180 compliant CSV table format factory to read and write data into
Kafka and other connectors. This requires a {{SerializationSchemaFactory}} and {{DeserializationSchemaFactory}}.
How we want to represent all data types and nested types is still up for discussion. For example,
we could flatten and deflatten nested types as it is done [here|http://support.gnip.com/articles/json2csv.html].
We can also have a look how tools such as the Avro to CSV tool perform the conversion.

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