Too strong config validation for clustering option

[zachary-povey]

I may have misunderstood, but in com.wepay.kafka.connect.bigquery.config.BigQuerySinkTaskConfig line 243 it seems that we are asserting that if timestampPartitionFieldName isn't set and bigQueryPartitionDecorator is set to false then the resulting table won't be partitioned (and thus we cannot cluster).

I don't believe this is the case, we will still be partitioned using the _PARTITIONTIME pseudo-column, however the messages will be assigned a partition by BigQuery based on when the message was received there - right?