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https://issues.apache.org/jira/browse/SPARK-8770?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14611101#comment-14611101
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Apache Spark commented on SPARK-8770:
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User 'rxin' has created a pull request for this issue:
https://github.com/apache/spark/pull/7170
> BinaryOperator expression
> -------------------------
>
> Key: SPARK-8770
> URL: https://issues.apache.org/jira/browse/SPARK-8770
> Project: Spark
> Issue Type: Sub-task
> Components: SQL
> Reporter: Reynold Xin
> Assignee: Reynold Xin
>
> Our current BinaryExpression abstract class is not for generic binary
> expressions, i.e. it requires left/right children to have the same type.
> However, due to its name, contributors build new binary expressions that
> don't have that assumption (e.g. Sha) and still extend BinaryExpression.
> We should create a new BinaryOperator abstract class with this assumption,
> and update the analyzer to only apply type casting rule there.
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