Support TiSparkR with dplyr/sparklyr

[harryprince]

dplyr can connect tidb/spark at remote mode. Is it possible add TiSparkR support the remote mode too?

sparklyr/dplyr is a better spark interface than SparkR in R community. R user can connect TiSpakr like Tidb, and don't need to change any code.

• http://spark.rstudio.com/extensions/
• https://cosx.org/2018/05/sparkr-vs-sparklyr/

[ilovesoup]

Thanks for the suggestion and we will take a look.