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https://issues.apache.org/jira/browse/SPARK-10947?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yin Huai resolved SPARK-10947.
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Resolution: Fixed
Fix Version/s: 1.6.0
Issue resolved by pull request 9249
[https://github.com/apache/spark/pull/9249]
> With schema inference from JSON into a Dataframe, add option to infer all
> primitive object types as strings
> -----------------------------------------------------------------------------------------------------------
>
> Key: SPARK-10947
> URL: https://issues.apache.org/jira/browse/SPARK-10947
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 1.5.1
> Reporter: Ewan Leith
> Priority: Minor
> Fix For: 1.6.0
>
>
> Currently, when a schema is inferred from a JSON file using
> sqlContext.read.json, the primitive object types are inferred as string,
> long, boolean, etc.
> However, if the inferred type is too specific (JSON obviously does not
> enforce types itself), this causes issues with merging dataframe schemas.
> Instead, we would like an option in the JSON inferField function to treat all
> primitive objects as strings.
> We'll create and submit a pull request for this for review.
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