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https://issues.apache.org/jira/browse/SPARK-4523?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Michael Armbrust resolved SPARK-4523.
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Resolution: Won't Fix
We haven't changed this for a few release now, and it seem unlikely that we
will so I'm going to close this issue.
> Improve handling of serialized schema information
> -------------------------------------------------
>
> Key: SPARK-4523
> URL: https://issues.apache.org/jira/browse/SPARK-4523
> Project: Spark
> Issue Type: Bug
> Components: SQL
> Reporter: Michael Armbrust
> Priority: Critical
>
> There are several issues with our current handling of metadata serialization,
> which is especially troublesome since this is the only place that we persist
> information directly using Spark SQL. Moving forward we should do the
> following:
> - Relax the parsing so that it does not fail when optional fields are
> missing (i.e. containsNull or metadata)
> - Include a regression suite that attempts to read old parquet files written
> by previous versions of Spark SQL.
> - Provide better warning messages when various forms of parsing fail (I
> think that it is silent right now which makes tracking down bugs more
> difficult than it needs to be).
> - Deprecate (display a warning) when reading data with the old case class
> schema representation and eventually remove it.
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