I do not see a type for representing naive / civil time / explicitly no timezone timestamps in Avro files.
BigQuery has this functionality through the DATETIME data type. Currently, when BigQuery exports to Avro, they encode the value as an RFC 3339 string, but without timezone information (e.g. "1970-01-01T00:00:00") and call the logical type / SQL type "datetime", but this behavior isn't currently documented. I'd like for BigQuery to use a community standard for datetime (timezoneless timestamps), so it'd be great to get some consensus on how it should do this. Related work: Parquet uses timestamp logical type, but with "isAdjustedToUTC" parameter for this use case https://issues.apache.org/jira/browse/PARQUET-1545
