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https://issues.apache.org/jira/browse/SPARK-17537?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sean Owen resolved SPARK-17537.
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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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