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

["Liang-Chi Hsieh (JIRA)" <ji...@apache.org>]

Liang-Chi Hsieh created SPARK-21954:
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             Summary: 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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