AvroSchemaConverter silently drops typed_value when converting shredded variant schemas

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#3,477 opened on Apr 14, 2026 6 comments 0 reactions 1 assignee View on GitHub

@nssalian is already working on this.

Since Apr 15, 2026.

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Description

Type: bug

Describe the bug, including details regarding any error messages, version, and platform.

I noticed this on the parquet-cli while checking the schema for a shredded parquet file.

Essentially, given this Parquet schema:

message table {
  required group data (VARIANT(1)) {
    required binary metadata;
    optional binary value;
    optional group typed_value {
      required group name {
        optional binary value;
        optional binary typed_value (STRING);
      }
      required group age {
        optional binary value;
        optional int32 typed_value (INTEGER(8,true));
      }
    }
  }
}

AvroSchemaConverter.convert() produces:

{
  "type": "record",
  "name": "data",
  "fields": [
    {"name": "metadata", "type": "bytes"},
    {"name": "value", "type": "bytes"}
  ]
}

typed_value is missing

Expected: The converter should convert all children of the VARIANT group (including typed_value when present)

Version: 1.18.0-SNAPSHOT

I can add a fix to this myself if there are no objections. If we want to keep this behavior, we should make a note.

Component(s)

Avro

Dominant language: Java
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