Ying Xu created PARQUET-1595:
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Summary: Parquet proto writer de-nest Protobuf wrapper classes
Key: PARQUET-1595
URL: https://issues.apache.org/jira/browse/PARQUET-1595
Project: Parquet
Issue Type: Improvement
Components: parquet-mr
Reporter: Ying Xu
Existing Parquet protobuf writer support preserves the structure of any
Protobuf Message objects. This works well in most cases. However, when dealing
with [Protobuf wrapper
messages|https://github.com/protocolbuffers/protobuf/blob/master/src/google/protobuf/wrappers.proto],
users may prefer directly writing the de-nested value into the Parquet files,
for ease of querying them directly (in query engine such as Hive/Presto).
Proposal:
* Implement a control flag, e.g., enableDenestingProtoWrappers, to control
whether or not to denest Protobuf wrapper classes.
* When this flag is set to true, write the Protobuf wrapper classes as single
primitive fields, based on the type of the wrapped *value* field.
||Protobuf Type||Parquet Type||
|BoolValue|boolean|
|BytesValue|binary|
|DoubleValue|double|
|FloatValue|float|
|Int32Value|int64 (32-bit, signed)|
|Int64Value|int64 (64-bit, signed)|
|StringValue|binary (string)|
|UInt32Value|int64 (32-bit, unsigned)|
|UInt64Value|int64 (64-bit, unsigned)|
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