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https://issues.apache.org/jira/browse/FLINK-17752?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17134164#comment-17134164
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Jark Wu commented on FLINK-17752:
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Hi [~twalthr], I can see your points. I'm also fine to have a strict 
interpreting. To summary the result, for {{TIMESTAMP WITHOUT TIME ZONE}}, if 
the {{timestamp-format}} is {{"SQL"}}, then parsed and generated value is 
always "2020-06-12 11:46:22.123456789" (without "T" and time zone). If the 
{{timestamp-format}} is {{"ISO-8601"}}, then the parsed and generated value is 
always "2020-06-12T11:46:22.123456789" (with "T" and without time zone). Other 
formats are not supported for {{TIMESTAMP WITHOUT TIME ZONE}}. {{"ISO-8601"}} 
and {{"RFC-3339"}} are both supported for {{TIMESTAMP WITH LOCAL TIME ZONE}}, 
but requires the value with "Z" suffix. Does that make sense to you?

> Align the timestamp format with Flink SQL types in JSON format
> --------------------------------------------------------------
>
>                 Key: FLINK-17752
>                 URL: https://issues.apache.org/jira/browse/FLINK-17752
>             Project: Flink
>          Issue Type: Bug
>          Components: Formats (JSON, Avro, Parquet, ORC, SequenceFile), Table 
> SQL / Ecosystem
>            Reporter: Jark Wu
>            Assignee: Shengkai Fang
>            Priority: Critical
>             Fix For: 1.11.0
>
>
> Currently, we are using RFC3339_TIMESTAMP_FORMAT (which will add timezone at 
> the end of string) to as the timestamp format in JSON. However, the string 
> representation fo {{TIMESTAMP (WITHOUT TIME ZONE)}} shoudn't adding 'Z' at 
> the end. 
> Other discussions: 
> [1]: 
> http://apache-flink-user-mailing-list-archive.2336050.n4.nabble.com/TIME-TIMESTAMP-parse-in-Flink-TABLE-SQL-API-td33061.html
> [2]: 
> http://apache-flink.147419.n8.nabble.com/json-timestamp-json-flink-sql-td1914.html
> [3]: http://apache-flink.147419.n8.nabble.com/FLINK-SQL-td2074.html



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