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https://issues.apache.org/jira/browse/SPARK-24204?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16471283#comment-16471283
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Takeshi Yamamuro commented on SPARK-24204:
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ok, I'll do it later. Thanks for the description update, too.
> Verify a write schema in Json/Orc/ParquetFileFormat
> ---------------------------------------------------
>
> Key: SPARK-24204
> URL: https://issues.apache.org/jira/browse/SPARK-24204
> Project: Spark
> Issue Type: Improvement
> Components: SQL
> Affects Versions: 2.3.0
> Reporter: Takeshi Yamamuro
> Priority: Minor
>
> *SUMMARY*
> - CSV: Raising analysis exception.
> - JSON: dropping columns with null types
> - Parquet/ORC: raising runtime exceptions
> The native orc file format throws an exception with a meaningless message in
> executor-sides when unsupported types passed;
> {code}
> scala> val rdd = spark.sparkContext.parallelize(List(Row(1, null), Row(2,
> null)))
> scala> val schema = StructType(StructField("a", IntegerType) ::
> StructField("b", NullType) :: Nil)
> scala> val df = spark.createDataFrame(rdd, schema)
> scala> df.write.orc("/tmp/orc")
> java.lang.IllegalArgumentException: Can't parse category at
> 'struct<a:int,b:null^>'
> at
> org.apache.orc.TypeDescription.parseCategory(TypeDescription.java:223)
> at org.apache.orc.TypeDescription.parseType(TypeDescription.java:332)
> at
> org.apache.orc.TypeDescription.parseStruct(TypeDescription.java:327)
> at org.apache.orc.TypeDescription.parseType(TypeDescription.java:385)
> at org.apache.orc.TypeDescription.fromString(TypeDescription.java:406)
> at
> org.apache.spark.sql.execution.datasources.orc.OrcSerializer.org$apache$spark$sql$execution$datasources$orc$OrcSerializer$$createOrcValue(OrcSerializ
> er.scala:226)
> at
> org.apache.spark.sql.execution.datasources.orc.OrcSerializer.<init>(OrcSerializer.scala:36)
> at
> org.apache.spark.sql.execution.datasources.orc.OrcOutputWriter.<init>(OrcOutputWriter.scala:36)
> at
> org.apache.spark.sql.execution.datasources.orc.OrcFileFormat$$anon$1.newInstance(OrcFileFormat.scala:108)
> at
> org.apache.spark.sql.execution.datasources.FileFormatWriter$SingleDirectoryWriteTask.newOutputWriter(FileFormatWriter.scala:376)
> at
> org.apache.spark.sql.execution.datasources.FileFormatWriter$SingleDirectoryWriteTask.execute(FileFormatWriter.scala:387)
> at
> org.apache.spark.sql.execution.datasources.FileFormatWriter$$anonfun$org$apache$spark$sql$execution$datasources$FileFormatWriter$$executeTask$3.apply
> (FileFormatWriter.scala:278)
> {code}
> It seems to be better to verify a write schema in a driver side for users
> along with the CSV fromat;
> https://github.com/apache/spark/blob/76ecd095024a658bf68e5db658e4416565b30c17/sql/core/src/main/scala/org/apache/spark/sql/execution/datasources/csv/CSVFileFormat.scala#L65
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