[jira] [Created] (SPARK-18407) Inferred partition columns cause assertion error

["Michael Armbrust (JIRA)" <ji...@apache.org>]

Michael Armbrust created SPARK-18407:
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             Summary: Inferred partition columns cause assertion error
                 Key: SPARK-18407
                 URL: https://issues.apache.org/jira/browse/SPARK-18407
             Project: Spark
          Issue Type: Bug
          Components: Structured Streaming
    Affects Versions: 2.0.2
            Reporter: Michael Armbrust
            Priority: Critical


[This assertion|https://github.com/apache/spark/blob/16eaad9daed0b633e6a714b5704509aa7107d6e5/sql/core/src/main/scala/org/apache/spark/sql/execution/streaming/StreamExecution.scala#L408] fails when you run a stream against json data that is stored in partitioned folders, if you manually specify the schema and that schema omits the partitioned columns.

My hunch is that we are inferring those columns even though the schema is being passed in manually and adding them to the end.

While we are fixing this bug, it would be nice to make the assertion better.  Truncating is not terribly useful as, at least in my case, it truncated the most interesting part.  I changed it to this while debugging:

{code}
          s"""
             |Batch does not have expected schema
             |Expected: ${output.mkString(",")}
             |Actual: ${newPlan.output.mkString(",")}
             |
             |== Original ==
             |$logicalPlan
             |
             |== Batch ==
             |$newPlan
           """.stripMargin
{code}



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