Handling of field type in BigQuery table schema definition is incorrect

When setting the field type to "record" in BigQuery schema definition, the following exception is thrown

}}{{2019-07-03 08:35:24,964 ERROR [Timer-Driven Process Thread-8] o.a.n.p.gcp.bigquery.PutBigQueryBatch PutBigQueryBatch[id=b2b1c6bf-016b-1000-e8c9-b3f9fb5b417e] null: java.lang.NullPointerException
java.lang.NullPointerException: null
    at org.apache.nifi.processors.gcp.bigquery.BigQueryUtils.mapToField(BigQueryUtils.java:42)
    at org.apache.nifi.processors.gcp.bigquery.BigQueryUtils.listToFields(BigQueryUtils.java:68)
    at org.apache.nifi.processors.gcp.bigquery.BigQueryUtils.schemaFromString(BigQueryUtils.java:80)
    at org.apache.nifi.processors.gcp.bigquery.PutBigQueryBatch.onTrigger(PutBigQueryBatch.java:277)
    at org.apache.nifi.processor.AbstractProcessor.onTrigger(AbstractProcessor.java:27)
    at org.apache.nifi.controller.StandardProcessorNode.onTrigger(StandardProcessorNode.java:1162)
    at org.apache.nifi.controller.tasks.ConnectableTask.invoke(ConnectableTask.java:209)
    at org.apache.nifi.controller.scheduling.TimerDrivenSchedulingAgent$1.run(TimerDrivenSchedulingAgent.java:117)
    at org.apache.nifi.engine.FlowEngine$2.run(FlowEngine.java:110)
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
    at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:308)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$301(ScheduledThreadPoolExecutor.java:180)
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:294)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
    at java.lang.Thread.run(Thread.java:748)

This seems to happen because the type handling is ... not so good

Beside, it seems like the TYPE case is not handled correctly, and RECORD type is absolutly not handled.