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https://issues.apache.org/jira/browse/SPARK-21954?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Apache Spark reassigned SPARK-21954:
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Assignee: Apache Spark
> JacksonUtils should verify MapType's value type instead of key type
> -------------------------------------------------------------------
>
> Key: SPARK-21954
> URL: https://issues.apache.org/jira/browse/SPARK-21954
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Affects Versions: 2.2.0
> Reporter: Liang-Chi Hsieh
> Assignee: Apache Spark
>
> {{JacksonUtils.verifySchema}} verifies if a data type can be converted to
> JSON. For {{MapType}}, it now verifies the key type. However, in
> {{JacksonGenerator}}, when converting a map to JSON, we only care about its
> values and create a writer for the values. The keys in a map are treated as
> strings by calling {{toString}} on the keys.
> Thus, we should change {{JacksonUtils.verifySchema}} to verify the value type
> of {{MapType}}.
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