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https://issues.apache.org/jira/browse/EMPIREDB-336?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17310498#comment-17310498
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Rainer Döbele commented on EMPIREDB-336:
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previous changes had to be removed in order to preserver cross-database-joins
Issue will be closed
> Add validity checks for Join expressions
> ----------------------------------------
>
> Key: EMPIREDB-336
> URL: https://issues.apache.org/jira/browse/EMPIREDB-336
> Project: Empire-DB
> Issue Type: Improvement
> Reporter: Rainer Döbele
> Assignee: Rainer Döbele
> Priority: Minor
>
> When definin joins using invalid column expression a NullPointerException
> will be thrown which gives the user no clue about the underlying reason.
> Add validity checks to improve this.
>
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