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https://issues.apache.org/jira/browse/FLINK-14296?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16941677#comment-16941677
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Jiayi Liao commented on FLINK-14296:
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[~dawidwys]
Actually the partitionKeyList / columnList / propertyList is an empty list if
it's not included and we do not support primary keys and unique keys now. Maybe
we should not check against null value at all?
> 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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