[jira] [Commented] (SPARK-21954) JacksonUtils should verify MapType's value type instead of key type

["Apache Spark (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/SPARK-21954?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16158300#comment-16158300 ] 

Apache Spark commented on SPARK-21954:
--------------------------------------

User 'viirya' has created a pull request for this issue:
https://github.com/apache/spark/pull/19167

> 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
>
> {{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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