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https://issues.apache.org/jira/browse/FLINK-25699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17492601#comment-17492601
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Sergey Nuyanzin commented on FLINK-25699:
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By the way I submitted a PR once you have time please have a look
> Use HashMap for MAP value constructors
> --------------------------------------
>
> Key: FLINK-25699
> URL: https://issues.apache.org/jira/browse/FLINK-25699
> Project: Flink
> Issue Type: Sub-task
> Components: Table SQL / Runtime
> Reporter: Timo Walther
> Assignee: Sergey Nuyanzin
> Priority: Major
> Labels: pull-request-available
>
> Currently, the usage of maps is inconsistent. It is not ensured that
> duplicate keys get eliminated. For CAST and output conversion this is solved.
> However, we should have a similar implementation in MAP value constructor
> like in CAST.
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