Viktor Khristenko created SPARK-20593:
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Summary: Writing Parquet: Cannot build an empty group
Key: SPARK-20593
URL: https://issues.apache.org/jira/browse/SPARK-20593
Project: Spark
Issue Type: Question
Components: Spark Core, Spark Shell
Affects Versions: 2.1.1
Environment: I use Apache Spark 2.1.1 (used 2.1.0 and it was the same,
switched today). Tested only Mac
Reporter: Viktor Khristenko
Priority: Minor
Hi,
This is my first ticket and I apologize for/if I'm doing certain things in an
improper way.
I have a dataset:
root
|-- muons: array (nullable = true)
| |-- element: struct (containsNull = true)
| | |-- reco::Candidate: struct (nullable = true)
| | |-- qx3_: integer (nullable = true)
| | |-- pt_: float (nullable = true)
| | |-- eta_: float (nullable = true)
| | |-- phi_: float (nullable = true)
| | |-- mass_: float (nullable = true)
| | |-- vertex_: struct (nullable = true)
| | | |-- fCoordinates: struct (nullable = true)
| | | | |-- fX: float (nullable = true)
| | | | |-- fY: float (nullable = true)
| | | | |-- fZ: float (nullable = true)
| | |-- pdgId_: integer (nullable = true)
| | |-- status_: integer (nullable = true)
| | |-- cachePolarFixed_: struct (nullable = true)
| | |-- cacheCartesianFixed_: struct (nullable = true)
As you can see, there are 3 empty structs in this schema. I know 100% that I
can read/manipulate/do whatever. However, when I try writing to disk in
parquet, I get the following Exception:
ds.write.format("parquet").save(outputPathName):
java.lang.IllegalStateException: Cannot build an empty group
at org.apache.parquet.Preconditions.checkState(Preconditions.java:91)
at org.apache.parquet.schema.Types$BaseGroupBuilder.build(Types.java:622)
at org.apache.parquet.schema.Types$BaseGroupBuilder.build(Types.java:497)
at org.apache.parquet.schema.Types$Builder.named(Types.java:286)
at
org.apache.spark.sql.execution.datasources.parquet.ParquetSchemaConverter.convertField(ParquetSchemaConverter.scala:535)
at
org.apache.spark.sql.execution.datasources.parquet.ParquetSchemaConverter.convertField(ParquetSchemaConverter.scala:321)
at
org.apache.spark.sql.execution.datasources.parquet.ParquetSchemaConverter$$anonfun$convertField$1.apply(ParquetSchemaConverter.scala:534)
at
org.apache.spark.sql.execution.datasources.parquet.ParquetSchemaConverter$$anonfun$convertField$1.apply(ParquetSchemaConverter.scala:533)
So, basically I would like to understand if it's a bug or an intended
behavior??? I also assume that it's related to the empty structs. Any help
would be really appreciated!
I've quickly created stripped version and that one works without any issues!
For reference, I put a link to a original question on SO[1]
VK
[1]
http://stackoverflow.com/questions/43767358/apache-spark-parquet-cannot-build-an-empty-group
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