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https://issues.apache.org/jira/browse/FLINK-25699?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17483100#comment-17483100
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Timo Walther commented on FLINK-25699:
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This test is actually using an outdated test base. The new
{{BuiltInFunctionTestBase}} is actually a better fit because it tests against
concrete classes such as {{Row.of(new HashMap)}}. The equals/hashCode support
all data types that can come out of the system.
> 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
>
> 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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