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From "ASF GitHub Bot (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (FLINK-9964) Add a CSV table format factory
Date Sun, 12 Aug 2018 07:45:00 GMT

    [ https://issues.apache.org/jira/browse/FLINK-9964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16577444#comment-16577444
] 

ASF GitHub Bot commented on FLINK-9964:
---------------------------------------

buptljy opened a new pull request #6541: [FLINK-9964][Table API & SQL] - Add a CSV table
format factory
URL: https://github.com/apache/flink/pull/6541
 
 
   ## What is the purpose of the change
   Add a csv table format factory which can be used by connectors like kafka.
   
   ## Brief change log
   
   - Create a flink-csv module in flink-formats module.
   - jackson-dataformat-csv is imported to support RFC 4180 standards.
   - CsvRowFormatFactory, CsvRowSchemaConverter, CsvRowDeserializationSchema and CsvRowSerializationSchema
is added.
   - add three attributes into Csv: array elements delimiter, escape character and bytes charset.
   
   ## Verifying this change
   
   - Unit tests for CsvRowFormatFactory, CsvRowSchemaConverter, CsvRowDeserializationSchema
and CsvRowSerializationSchema.
   
   ## Does this pull request potentially affect one of the following parts:
   
     - Dependencies (does it add or upgrade a dependency): yes
     - The public API, i.e., is any changed class annotated with `@Public(Evolving)`: yes
     - The serializers: (yes / no / don't know)no
     - The runtime per-record code paths (performance sensitive): no
     - Anything that affects deployment or recovery: JobManager (and its components), Checkpointing,
Yarn/Mesos, ZooKeeper: no
     - The S3 file system connector: no
   
   ## Documentation
   
     - Does this pull request introduce a new feature? no
   

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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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