Timestamp types cause "failed to execute query" error on ExecuteBatch of gRPC API

[jdavies]

I'm cross-posting this here by request. Here is the original issue: stargate/stargate-grpc-go-client#29

Here is a summary of that isue:

I created a Cassandra table which has a column which expects a timestamp type. On a normal insert, I can insert rows without any issue. However, when I try to create a batch Query which tries to insert multiple rows, I either get a failed to execute query "String didn't validate" error or "expected 8 or 0 byte long for date" error.