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https://issues.apache.org/jira/browse/SAMZA-2299?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Bharath Kumarasubramanian resolved SAMZA-2299.
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Resolution: Fixed
> StreamTableJoin Operator should invoke user join function only once
> -------------------------------------------------------------------
>
> Key: SAMZA-2299
> URL: https://issues.apache.org/jira/browse/SAMZA-2299
> Project: Samza
> Issue Type: Bug
> Reporter: Bharath Kumarasubramanian
> Assignee: Bharath Kumarasubramanian
> Priority: Major
> Time Spent: 40m
> Remaining Estimate: 0h
>
> In StreamTableJoinOperator, we currently invoke the user join function again
> with null record if the first call to join function returns a null. This is
> not desirable in use cases for anti-join where subsequent invocation of join
> function could result in different results.
>
> {code:java}
> Optional.ofNullable(value)
> .map(val -> (R) KV.of(key, val)
> .map(record -> joinOpSpec.getJoinFn().apply(message, record))
> .orElseGet(() -> joinOpSpec.getJoinFn().apply(message, null)); // this is
> the additional invocation that happens if the previous invocation returns a
> null{code}
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