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Apache Parquet Java
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Cannot read schema from parquet file #2690

Open asfimport opened 2 years ago

asfimport commented 2 years ago

I'm trying to generate a Avro schema from a parquet file. I get the issue both when using https://github.com/benwatson528/intellij-avro-parquet-plugin in Intellij as well as when I'm using my own implementation of generating a schema.

The parquet file contains nested entries and arrays: {"a": a, "b": [{"c": c}]}

I get the following error message:


org.apache.avro.SchemaParseException: Can't redefine: element
    at org.apache.avro.Schema$Names.put(Schema.java:1547)
    at org.apache.avro.Schema$NamedSchema.writeNameRef(Schema.java:810)
    at org.apache.avro.Schema$RecordSchema.toJson(Schema.java:972)
    at org.apache.avro.Schema$UnionSchema.toJson(Schema.java:1239)
    at org.apache.avro.Schema$RecordSchema.fieldsToJson(Schema.java:1000)
    at org.apache.avro.Schema$RecordSchema.toJson(Schema.java:984)
    at org.apache.avro.Schema$ArraySchema.toJson(Schema.java:1134)
    at org.apache.avro.Schema$UnionSchema.toJson(Schema.java:1239)
    at org.apache.avro.Schema$RecordSchema.fieldsToJson(Schema.java:1000)
    at org.apache.avro.Schema$RecordSchema.toJson(Schema.java:984)
    at org.apache.avro.Schema$UnionSchema.toJson(Schema.java:1239)
    at org.apache.avro.Schema$RecordSchema.fieldsToJson(Schema.java:1000)
    at org.apache.avro.Schema$RecordSchema.toJson(Schema.java:984)
    at org.apache.avro.Schema.toString(Schema.java:424)
    at org.apache.avro.Schema.toString(Schema.java:396)
    at uk.co.hadoopathome.intellij.viewer.fileformat.ParquetFileReader.getSchema(ParquetFileReader.java:65)
    at uk.co.hadoopathome.intellij.viewer.FileViewerToolWindow$2.doInBackground(FileViewerToolWindow.java:196)
    at uk.co.hadoopathome.intellij.viewer.FileViewerToolWindow$2.doInBackground(FileViewerToolWindow.java:184)
    at java.desktop/javax.swing.SwingWorker$1.call(SwingWorker.java:304)
    at java.base/java.util.concurrent.FutureTask.run(FutureTask.java:264)
    at java.desktop/javax.swing.SwingWorker.run(SwingWorker.java:343)
    at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
    at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
    at java.base/java.lang.Thread.run(Thread.java:829) 

It appears to be an issue similar to PARQUET-1441 or PARQUET-1409.

Or could it possibly be something wrong in my parquet file?

Reporter: Nils Broman

Note: This issue was originally created as PARQUET-2153. Please see the migration documentation for further details.

asfimport commented 2 years ago

Nils Broman: I found out that this is indeed the same issue as for PARQUET-1441, however for FixedSchema. The fix is isolated to RecordSchema and the same fix needs to be applied to FixedSchema as well.

asfimport commented 2 years ago

Timothy Miller / @theosib-amazon: Is this related to anything fixed by https://github.com/apache/parquet-mr/pull/957 ?

asfimport commented 2 years ago

Nils Broman: I just tested the fix you mention and I still got the same error, so unfortunately it does not fix this issue.