Support protobuf struct type

[tscottcoombes1]

Describe the enhancement requested

current

no support for protobuf struct type, due to recursion issue, Struct -> Value -> Struct -> Value ....

message Struct {
  // Unordered map of dynamically typed values.
  map<string, Value> fields = 1;
}

message Value {
  // The kind of value.
  oneof kind {
    // Represents a null value.
    NullValue null_value = 1;
    // Represents a double value.
    double number_value = 2;
    // Represents a string value.
    string string_value = 3;
    // Represents a boolean value.
    bool bool_value = 4;
    // Represents a structured value.
    Struct struct_value = 5;
    // Represents a repeated `Value`.
    ListValue list_value = 6;
  }
}

expected

add support

suggest following pyspark impl: https://spark.apache.org/docs/latest/sql-data-sources-protobuf.html#handling-circular-references-protobuf-fields

Component(s)

Other