[jira] [Updated] (FLINK-19749) Improve documentation for "Column Operations" in Table API page

["Jark Wu (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/FLINK-19749?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Jark Wu updated FLINK-19749:
----------------------------
    Summary: Improve documentation for "Column Operations" in Table API page  (was: document error)

> 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
>            Reporter: appleyuchi
>            Priority: Major
>
> 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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