必须先将通过STable创建的表先删除，然后才能删除超级表。当级联表很多时就麻烦了，除非写代码来删除。

Hello,

While following the docs (https://docs.vaex.io/en/latest/ml.html), I've encountered the error stated in the title while trying the code in cell [7].

Responsible line:
xgmodel = vaex.ml.xgboost.XGBModel(features=features, num_round=10, param=param)

When a new version of Apache Spark is released, we'd have to make changes in the code base to add any new APIs, account for new protocol changes on the worker-side etc. We should document this to allow anyone to upgrade .NET for Apache Spark to newer versions.

Success Criteria

• Clearly call out code changes with examples
• Capture caveats one might encounter during this upgrade process

On home page of website: https://nlp.johnsnowlabs.com/ I read "Full Python, Scala, and Java support"

Unfortunately it's 3 days now I'm trying to use Spark NLP in Java without any success.

• I cannot find Java API (JavaDoc) of the framework.
• not event a single example in Java is available
• I do not know Scala, I do not know how to convert things like:
  val testData = spark.createDataFrame(

Because some user has had problems configuring these services could be helpful to make some examples or videos about how to properly setup Optimus in this services.

Is this a BUG REPORT or FEATURE REQUEST?:

/kind feature

Description:

There're several features in volcano right now; not only scheduling algorithm but also job management. It's better to manage those features by version, e.g. Alpha, Beta, GA, that'll be helpful for user to evaluate which features should be enabled in their environment.

@JeanPaulShapo, there is a recommendation In current installation instruction to install python packages with sudo pip install, which isn't a good idea. It may be worth replacing it with pip install --user or via virtualenv.

效果如下

http://gitlab.zte.com.cn/10045812/jigsaw/issues/267