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https://issues.apache.org/jira/browse/FLINK-19749?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17220110#comment-17220110
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Roc Marshal commented on FLINK-19749:
-------------------------------------

Hi, 
[~jark]
[~appleyuchi]
Is it more appropriate if the jira title is set as 'Update expired sample code 
and semantics' ?
I hope to be able to fix some old code usage problems  as shown in the 
picture[Old API examples.png] in this PR.

What do you think of it ?




> Improve documentation for "Column Operations" in Table API page
> ---------------------------------------------------------------
>
>                 Key: FLINK-19749
>                 URL: https://issues.apache.org/jira/browse/FLINK-19749
>             Project: Flink
>          Issue Type: Improvement
>          Components: Documentation, Table SQL / API
>            Reporter: appleyuchi
>            Priority: Major
>         Attachments: Old API examples.png
>
>
> in this 
> [link|https://ci.apache.org/projects/flink/flink-docs-stable/dev/table/tableApi.html]
>  there's a "description":
> *Performs a field add operation. Existing fields will be replaced if add 
> columns name is the same as the existing column name. Moreover, if the added 
> fields have duplicate field name, then the last one is used.*
> Two point:
> ①" add columns name "->" added column's name"
> ②"if the added fields have duplicate field name",
> what's the example that has two duplicate field name?
> Could you modify them?
> They're a little misleading/unclear.



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