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)

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