PARQUET-2466: Simplify logic when calling ParquetWriter

[Fokko]

I think this is easier to read

Make sure you have checked all steps below.

Jira

• My PR addresses the following Parquet Jira issues and references
  them in the PR title. For example, "PARQUET-1234: My Parquet PR"
  • https://issues.apache.org/jira/browse/PARQUET-2466
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[wgtmac]

+1

Please fix the title before merging. Thanks!