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https://issues.apache.org/jira/browse/FLINK-14296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16945233#comment-16945233
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Jiayi Liao edited comment on FLINK-14296 at 10/6/19 3:12 AM:
-------------------------------------------------------------

[~jark]

+1, I'll submit a PR soon.


was (Author: wind_ljy):
[~jark]

> SqlNodes in the parser module should use an Optional for optional parameters
> ----------------------------------------------------------------------------
>
>                 Key: FLINK-14296
>                 URL: https://issues.apache.org/jira/browse/FLINK-14296
>             Project: Flink
>          Issue Type: Improvement
>          Components: Table SQL / API
>            Reporter: Dawid Wysakowicz
>            Priority: Major
>
> I want to suggest using Optional for optional parameters in classes such as 
> SqlCreateTable/SqlCreateView/SqlTableColumn etc.
> Right now we must check against null at different locations e.g.:
> {code}
> SqlNodeList partitionKey = sqlCreateTable.getPartitionKeyList();
> if (partitionKey != null) {
>       partitionKeys = partitionKey
>               .getList()
>               .stream()
>               .map(p -> ((SqlIdentifier) p).getSimple())
>               .collect(Collectors.toList());
> }
> {code}



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