[PARQUET-2181] parquet-cli fails at supporting parquet-protobuf generated files

• Type: Bug
• Status: Open
• Priority: Critical
• Resolution: Unresolved
• Component/s: parquet-cli
• Assignee: Unassigned
• Reporter: J Y
• Created: 31/Aug/22 05:37
• Updated: 07/Sep/22 19:36

Description

i generated a parquet file using a protobuf with this proto definition:

message IndexPath {
  // Index of item in path.
  repeated int32 index = 1;
}

message SomeEvent {
  // truncated/obfuscated wrapper
  optional IndexPath client_position = 1;
}

this gets translated to the following parquet schema using the new compliant schema for lists:

message SomeEvent {
  optional group client_position = 1 {
    optional group index (LIST) = 1 {
      repeated group list {
        required int32 element;
      }
    }
  }
}

this causes parquet-cli cat to barf on a file containing these events:

java.lang.RuntimeException: Failed on record 0
        at org.apache.parquet.cli.commands.CatCommand.run(CatCommand.java:86)
        at org.apache.parquet.cli.Main.run(Main.java:157)
        at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
        at org.apache.parquet.cli.Main.main(Main.java:187)
Caused by: java.lang.ClassCastException: required int32 element is not a group
        at org.apache.parquet.schema.Type.asGroupType(Type.java:248)
        at org.apache.parquet.avro.AvroRecordConverter.newConverter(AvroRecordConverter.java:284)
        at org.apache.parquet.avro.AvroRecordConverter.newConverter(AvroRecordConverter.java:228)
        at org.apache.parquet.avro.AvroRecordConverter.access$100(AvroRecordConverter.java:74)
        at org.apache.parquet.avro.AvroRecordConverter$AvroCollectionConverter$ElementConverter.<init>(AvroRecordConverter.java:539)
        at org.apache.parquet.avro.AvroRecordConverter$AvroCollectionConverter.<init>(AvroRecordConverter.java:489)
        at org.apache.parquet.avro.AvroRecordConverter.newConverter(AvroRecordConverter.java:293)
        at org.apache.parquet.avro.AvroRecordConverter.<init>(AvroRecordConverter.java:137)
        at org.apache.parquet.avro.AvroRecordConverter.newConverter(AvroRecordConverter.java:284)
        at org.apache.parquet.avro.AvroRecordConverter.<init>(AvroRecordConverter.java:137)
        at org.apache.parquet.avro.AvroRecordConverter.<init>(AvroRecordConverter.java:91)
        at org.apache.parquet.avro.AvroRecordMaterializer.<init>(AvroRecordMaterializer.java:33)
        at org.apache.parquet.avro.AvroReadSupport.prepareForRead(AvroReadSupport.java:142)
        at org.apache.parquet.hadoop.InternalParquetRecordReader.initialize(InternalParquetRecordReader.java:190)
        at org.apache.parquet.hadoop.ParquetReader.initReader(ParquetReader.java:166)
        at org.apache.parquet.hadoop.ParquetReader.read(ParquetReader.java:135)
        at org.apache.parquet.cli.BaseCommand$1$1.advance(BaseCommand.java:363)
        at org.apache.parquet.cli.BaseCommand$1$1.<init>(BaseCommand.java:344)
        at org.apache.parquet.cli.BaseCommand$1.iterator(BaseCommand.java:342)
        at org.apache.parquet.cli.commands.CatCommand.run(CatCommand.java:73)
        ... 3 more

using the old parquet-tools binary to cat this file works fine.