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https://issues.apache.org/jira/browse/SPARK-20918?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16028745#comment-16028745
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Apache Spark commented on SPARK-20918:
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User 'gatorsmile' has created a pull request for this issue:
https://github.com/apache/spark/pull/18142
> Use FunctionIdentifier as function identifiers in FunctionRegistry
> ------------------------------------------------------------------
>
> Key: SPARK-20918
> URL: https://issues.apache.org/jira/browse/SPARK-20918
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Xiao Li
> Assignee: Xiao Li
>
> Currently, the unquoted string of a function identifier is being used as the
> function identifier in the function registry. This could cause the incorrect
> the behavior when users use `.` in the function names.
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