Davies Liu resolved SPARK-17388.
       Resolution: Fixed
    Fix Version/s: 2.1.0

Issue resolved by pull request 14947

> Support for inferring type date/timestamp/decimal for partition column
> ----------------------------------------------------------------------
>                 Key: SPARK-17388
>                 URL: https://issues.apache.org/jira/browse/SPARK-17388
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 2.0.0
>            Reporter: Hyukjin Kwon
>             Fix For: 2.1.0
> Currently, Spark only supports to infer {{IntegerType}}, {{LongType}}, 
> {{DoubleType}} and {{StringType}}.
> {{DecimalType}} is being tried but it seems it never infers type as 
> {{DecimalType}} as {{DoubleType}} is being tried first.
> Also, {{DateType}} and {{TimestampType}} can be inferred. It seems it is a 
> pretty common to use both for a partition column.
> It'd be great if they can be inferred as both rather than just {{StringType}}.

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