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https://issues.apache.org/jira/browse/FLINK-19629?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17213565#comment-17213565
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Jark Wu commented on FLINK-19629:
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What's wrong with the example? Do you mean changing {{behavior STRING}} to
{{behavior STRING NULL}}? However, datatypes are nullable by default and we
don't support {{NULL}} AFAIK.
> English words are spelled incorrectly and an example is not provided
> --------------------------------------------------------------------
>
> Key: FLINK-19629
> URL: https://issues.apache.org/jira/browse/FLINK-19629
> Project: Flink
> Issue Type: Bug
> Components: Documentation
> Affects Versions: 1.11.2
> Reporter: shizhengchao
> Priority: Critical
> Fix For: 1.12.0
>
>
> the docs Connectors/Table & SQL Connectors/Formats/Avro:
> In addition to the types listed above, Flink supports reading/writing
> nullable types. Flink maps nullable types to Avro union(something, null),
> where something is the Avro type converted from Flink type.
> avro have no union type, should be unions:
> Avro unions(something, null)
> by the way, an example should be provided that reading/writing nullable
> types, such as this:
> {code:java}
> CREATE TABLE user_behavior (
> behavior STRING NULL
> ) WITH (
> 'connector' = 'kafka',
> 'topic' = 'user_behavior',
> 'properties.bootstrap.servers' = 'localhost:9092',
> 'properties.group.id' = 'testGroup',
> 'format' = 'avro'
> )
> {code}
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