Github user gatorsmile commented on a diff in the pull request:
https://github.com/apache/spark/pull/16330#discussion_r105562562
--- Diff: core/src/main/scala/org/apache/spark/api/r/RRDD.scala ---
@@ -127,6 +127,13 @@ private[r] object RRDD {
sparkConf.setExecutorEnv(name.toString, value.toString)
}
+ if (sparkEnvirMap.containsKey("spark.r.sql.default.derby.dir") &&
--- End diff --
Introduce "spark.sql.derby.system.home" in SQLConf as an internal config?
Set the default to `System.getProperty("derby.system.home")`? Then, in the R,
we can set "derby.system.home" to `tempdir()`?
Does it sound ok? @cloud-fan @rxin
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