[Task][Go SDK]: Remove reflect.Type parameter in parquetio.Write

[johannaojeling]

What needs to happen?

The parquetio.Write transform takes a t reflect.Type parameter, which is redundant since the type can be derived from the incoming PCollection.

It will be a backward incompatible change, however will be more consistent with the other IOs (bigqueryio, bigtableio and so on) and will remove the need for developers to write wrapper functions such as:

func WriteParquet(s beam.Scope, filename string, col beam.PCollection) {
    t := col.Type().Type()
    parquetio.Write(s, filename, t, col)
}

Issue Priority

Priority: 2 (default / most normal work should be filed as P2)

Issue Components

• Component: Python SDK
• Component: Java SDK
• Component: Go SDK
• Component: Typescript SDK
• Component: IO connector
• Component: Beam examples
• Component: Beam playground
• Component: Beam katas
• Component: Website
• Component: Spark Runner
• Component: Flink Runner
• Component: Samza Runner
• Component: Twister2 Runner
• Component: Hazelcast Jet Runner
• Component: Google Cloud Dataflow Runner

[johannaojeling]

.take-issue