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https://issues.apache.org/jira/browse/SPARK-17571?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15498465#comment-15498465
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Apache Spark commented on SPARK-17571:
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User 'petermaxlee' has created a pull request for this issue:
https://github.com/apache/spark/pull/15127
> AssertOnQuery.condition should be consistent in requiring Boolean return type
> -----------------------------------------------------------------------------
>
> Key: SPARK-17571
> URL: https://issues.apache.org/jira/browse/SPARK-17571
> Project: Spark
> Issue Type: Bug
> Components: SQL, Streaming
> Reporter: Peter Lee
>
> AssertOnQuery has two apply constructor: one that accepts a closure that
> returns boolean, and another that accepts a closure that returns Unit. This
> is actually very confusing because developers could mistakenly think that
> AssertOnQuery always require a boolean return type and verifies the return
> result, when indeed the value of the last statement is ignored in one of the
> constructors.
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