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https://issues.apache.org/jira/browse/SPARK-18624?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15704905#comment-15704905
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Apache Spark commented on SPARK-18624:
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User 'jiangxb1987' has created a pull request for this issue:
https://github.com/apache/spark/pull/16057
> Implict cast between ArrayTypes
> -------------------------------
>
> Key: SPARK-18624
> URL: https://issues.apache.org/jira/browse/SPARK-18624
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Reporter: Jiang Xingbo
> Priority: Minor
>
> Currently `ImplicitTypeCasts` doesn't handle casts between ArrayTypes, this
> is not convenient, we should add a rule to enable casting from
> ArrayType(InternalType) to ArrayType(newInternalType).
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