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https://issues.apache.org/jira/browse/SPARK-11010?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14983237#comment-14983237
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Rick Hillegas commented on SPARK-11010:
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Linking this issue to SPARK-10855. The api for declaring UDTs should make it
possible to bind a Spark-side class or wrapper to a user-defined Java class
which is stored in an external RDBMS and whose JDBC type is represented as
java.sql.Types.JAVA_OBJECT.
> Fixes and enhancements addressing UDTs' api and several usability concerns
> --------------------------------------------------------------------------
>
> Key: SPARK-11010
> URL: https://issues.apache.org/jira/browse/SPARK-11010
> Project: Spark
> Issue Type: Epic
> Components: SQL
> Affects Versions: 1.5.0, 1.5.1
> Reporter: John Muller
> Labels: UDT
> Original Estimate: 168h
> Remaining Estimate: 168h
>
> Catalyst SQL types allow for UserDefinedTypes, but do not allow for easy
> extension of 3rd party types or extensions to built-in types like DecimalType
> or StringType (private classes).
> Additionally, the API can infer much more of what's needed from the type
> parameter than it currently does.
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