can we add UPSERT option in write options?

[wangkailut]

No description provided.

[rashtao]

With the upcoming ArangoDB 3.7 we can support insert-update and insert-replace: https://github.com/arangodb/docs/blob/562b88a50d62a1ea0a16203cc2d755c6068509c1/3.7/release-notes-api-changes37.md#endpoints-augmented
I will implement support for such features once ArangoDB 3.7 will be released.
In the meantime you can explicitly set the WriteOptions.method to INSERT, UPDATE or REPLACE (https://github.com/arangodb/arangodb-spark-connector/blob/master/src/main/scala/com/arangodb/spark/WriteOptions.scala#L94-L119).

[rashtao]

This library has been now deprecated in favor of the new ArangoDB Datasource for Apache Spark.
If this issue is still relevant please reopen it in the new connector's project.