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AvroReadSupport should automatically detect file list encoding

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Issue 类型
功能
描述清晰度
基本清楚
活跃度
活跃
技术栈
java
领域
data-engineering

调研方向

Look at AvroReadSupport in the parquet-avro module to understand how list structures are currently handled. The detection logic must examine the Parquet schema's repeated group patterns to distinguish three-level and two-level lists. Testing will involve reading existing Parquet files with both list encodings to ensure automatic detection works without the configuration property.

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描述

Type: enhancement
Describe the enhancement requested

parquet-avro currently contains opt-in support for reading and writing both "three-level" lists:

required group mylist (LIST) {
  repeated group list {
    required int32 element;
  }
}

and "two level"/"legacy"/"old" lists:

required group mylist (LIST) {
  repeated int32 array;
}

The boolean Configuration property parquet.avro.write-old-list-structure controls which structure should be written, but readers have to specify the parquet.avro.write-old-list-structure property, too, if they're either (a) supplying a custom projection, or (b) reading a Parquet file that doesn't contain the parquet.avro.schema key in its file metadata.

Ideally the reader should be able to automatically detect both types of list encoding, so that we can keep the Configuration property as a writer-side implementation detail.

Component(s)

Avro

主要语言
Java
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