Sean Owen resolved SPARK-17537.
    Resolution: Duplicate

> Improve performance for reading parquet schema
> ----------------------------------------------
>                 Key: SPARK-17537
>                 URL: https://issues.apache.org/jira/browse/SPARK-17537
>             Project: Spark
>          Issue Type: Improvement
>          Components: SQL
>    Affects Versions: 1.6.2, 2.0.0
>            Reporter: Yang Wang
>            Priority: Minor
> spark.read.parquet would issue a spark job to read parquet schema. When 
> spark.sql.parquet.mergeSchema are set to false (the default value), there is 
> often only one file to read, so there is no need to issue a spark job to do 
> it. In this case, we can read it from driver directly instead of issuing a 
> spark job. This could reduce the infer schema latency from several hundreds 
> milliseconds to around ten milliseconds in my environment.

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